Range.setStartBefore() - Web APIs
the range.setstartbefore() method sets the start position of a range relative to another node.
... syntax range.setstartbefore(referencenode); parameters referencenode the node before which the range should start.
... example var range = document.createrange(); var referencenode = document.getelementsbytagname("div").item(0); range.setstartbefore(referencenode); specifications specification status comment domthe definition of 'range.setstartbefore()' in that specification.
... document object model (dom) level 2 traversal and range specificationthe definition of 'range.setstartbefore()' in that specification.

Window.onbeforeinstallprompt - Web APIs
the window.onbeforeinstallprompt property is an event handler for processing a beforeinstallprompt, which is dispatched on devices when a user is about to be prompted to "install" a web application.
... syntax window.addeventlistener("beforeinstallprompt", function(event) { ...
... }); window.onbeforeinstallprompt = function(event) { ...}; example the following example uses the beforeinstallprompt event to make an install button operable, by using the event inside a click handler.
... window.addeventlistener("beforeinstallprompt", function(beforeinstallpromptevent) { beforeinstallpromptevent.preventdefault(); // prevents immediate prompt display // shows prompt after a user clicks an "install" button installbutton.addeventlistener("click", function(mouseevent) { // you should not use the mouseevent here, obviously beforeinstallpromptevent.prompt(); }); installbutton.hidden = false; // make button operable }); ...

-webkit-border-before - CSS: Cascading Style Sheets
the -webkit-border-before css property is a shorthand property for setting the individual logical block start border property values in a single place in the style sheet.
... /* border values */ -webkit-border-before: 1px; -webkit-border-before: 2px dotted; -webkit-border-before: medium dashed blue; /* global values */ -webkit-border-before: inherit; -webkit-border-before: initial; -webkit-border-before: unset; -webkit-border-before can be used to set the values for one or more of: -webkit-border-before-width, -webkit-border-before-style, and -webkit-border-before-color.
...nd:border-top-width: mediumborder-right-width: mediumborder-bottom-width: mediumborder-left-width: mediumborder-style: as each of the properties of the shorthand:border-top-style: noneborder-right-style: noneborder-bottom-style: noneborder-left-style: nonecolor: varies from one browser to anotherapplies toall elementsinheritedyespercentagesas each of the properties of the shorthand:-webkit-border-before-width: logical-width of containing blockcomputed valueas each of the properties of the shorthand:border-width: as each of the properties of the shorthand:border-bottom-width: the absolute length or 0 if border-bottom-style is none or hiddenborder-left-width: the absolute length or 0 if border-left-style is none or hiddenborder-right-width: the absolute length or 0 if border-right-style is none or...
...)where <alpha-value> = <number> | <percentage><hue> = <number> | <angle> examples applying a border with vertical text html <div> <p class="exampletext">example text</p> </div> css div { background-color: yellow; width: 120px; height: 120px; } .exampletext { writing-mode: vertical-rl; -webkit-border-before: 5px dashed blue; } result specifications not part of any standard, but it relates to the standards-track border-block-start property.

SyntaxError: missing ; before statement - JavaScript
the javascript exception "missing ; before statement" occurs when there is a semicolon (;) missing somewhere and can't be added by automatic semicolon insertion (asi).
... message syntaxerror: expected ';' (edge) syntaxerror: missing ; before statement (firefox) error type syntaxerror.
...for example: var foo = 'tom's bar'; // syntaxerror: missing ; before statement you can use double quotes, or escape the apostrophe: var foo = "tom's bar"; var foo = 'tom\'s bar'; declaring properties with var you cannot declare properties of an object or array with a var declaration.
... var obj = {}; var obj.foo = 'hi'; // syntaxerror missing ; before statement var array = []; var array[0] = 'there'; // syntaxerror missing ; before statement instead, omit the var keyword: var obj = {}; obj.foo = 'hi'; var array = []; array[0] = 'there'; bad keywords if you come from another programming language, it is also common to use keywords that don't mean the same or have no meaning at all in javascript: def print(info){ console.log(info); }; // syntaxerror missing ; before statement instead, use function instead of def: function print(info){ console.log(info); }; ...

substring-before - XPath
xslt/xpath reference: xslt elements, exslt functions, xpath functions, xpath axes the substring-before function returns a string that is the part of a given string before a given substring.
... syntax substring-before(haystack ,needle ) arguments haystack the string to be evaluated.
...everything before the first occurrence ofneedle inhaystack will be returned.
... examples xpath example output substring-before('aa-bb','-') aa substring-before('aa-bb','a') (empty string) substring-before('aa-bb','b') aa- substring-before('aa-bb','q') (empty string) defined xpath 1.0 4.2 gecko support supported.

MozBeforePaint
once you've called this, the mozbeforepaint event will be fired one time, when it's time for animations to be updated for the window's next animation frame.
... frame rate control mozbeforepaint won't fire more than a fixed number of times per second, e.g.
...d="d" style="width:100px; height:100px; background:lime; position:relative;"></div> <script> var d = document.getelementbyid("d"); var start = window.mozanimationstarttime; function step(event) { var progress = event.timestamp - start; d.style.left = math.min(progress/10, 200) + "px"; if (progress < 2000) { window.mozrequestanimationframe(); } else { window.removeeventlistener("mozbeforepaint", step, false); } } window.addeventlistener("mozbeforepaint", step, false); window.mozrequestanimationframe(); </script> </body> </html> as you can see, each time the mozbeforepaint event fires, our step() method is called.

BeforeInstallPromptEvent.prompt() - Web APIs
the prompt() method of the beforeinstallpromptevent interface allows a developer to show the install prompt at a time of their own choosing.
... syntax beforeinstallpromptevent.prompt() parameters none.
... example var istoosoon = true; window.addeventlistener("beforeinstallprompt", function(e) { if (istoosoon) { e.preventdefault(); // prevents prompt display // prompt later instead: settimeout(function() { istoosoon = false; e.prompt(); // throws if called more than once or default not prevented }, 10000); } // the event was re-dispatched in response to our request // ...

HTMLElement: beforeinput event - Web APIs
the dom beforeinput event fires when the value of an <input>, <select>, or <textarea> element is about to be modified.
... bubbles yes cancelable yes interface inputevent event handler property none sync / async sync composed yes default action update the dom element examples this example logs current value of the element immediately before replacing that value with the new one applied to the <input> element.
... html <input placeholder="enter some text" name="name"/> <p id="values"></p> javascript const input = document.queryselector('input'); const log = document.getelementbyid('values'); input.addeventlistener('beforeinput', updatevalue); function updatevalue(e) { log.textcontent = e.target.value; } result specifications specification status ui eventsthe definition of 'beforeinput event' in that specification.

Window.onmozbeforepaint - Web APIs
summary an event handler for the mozbeforepaint event.
... syntax window.onmozbeforepaint = funcref; funcref is the handler function.
... notes this event fires immediately before the browser window is repainted, if the event has been requested by one or more scripts calling window.mozrequestanimationframe().

Document.onbeforescriptexecute - Web APIs
syntax document.onbeforescriptexecute = funcref; funcref is a function reference, called when the event is fired.
... example function starting(e) { logmessage("starting script with id: " + e.target.id); } document.addeventlistener("beforescriptexecute", starting, true); view live examples specification html5 ...

NodeIterator.pointerBeforeReferenceNode - Web APIs
the nodeiterator.pointerbeforereferencenode read-only property returns a boolean flag that indicates whether the nodefilter is anchored before (if this value is true) or after (if this value is false) the anchor node indicated by the nodeiterator.referencenode property.
... syntax flag = nodeiterator.pointerbeforereferencenode; example var nodeiterator = document.createnodeiterator( document.body, nodefilter.show_element, { acceptnode: function(node) { return nodefilter.filter_accept; } }, false ); flag = nodeiterator.pointerbeforereferencenode; specifications specification status comment domthe definition of 'nodeiterator.pointerbeforereferencenode' in that specification.

Window: beforeprint event - Web APIs
the beforeprint event is fired when the associated document is about to be printed or previewed for printing.
... bubbles no cancelable no interface event event handler property onbeforeprint examples using addeventlistener(): window.addeventlistener('beforeprint', (event) => { console.log('before print'); }); using the onbeforeprint event handler property: window.onbeforeprint = (event) => { console.log('before print'); }; specifications specification status html living standard living standard ...

MozBeforeResize - Archive of obsolete content
the mozbeforeresize event is executed before a browser window is resized.

beforecopy - Archive of obsolete content
the beforecopy event was part of copy logic override, a feature of the clipboard api added in january 2014 and removed in april 2016.

beforecut - Archive of obsolete content
the beforecut event was part of copy logic override, a feature of the clipboard api added in january 2014 and removed in april 2016.

beforepaste - Archive of obsolete content
the beforepaste event was part of copy logic override, a feature of the clipboard api added in january 2014 and removed in april 2016.

beforeselected - Archive of obsolete content
« xul reference home beforeselected type: boolean this is set to true if the tab is immediately before the currently selected tab.

insertbefore - Archive of obsolete content
« xul reference home insertbefore type: id when an element is in an overlay, the insertbefore attribute specifies the id of the element in the base window that the element should appear before.

onbeforeaccept - Archive of obsolete content
« xul reference home onbeforeaccept type: script code the code in this attribute is called when the ok button is pressed or the acceptdialog method is called.

resizebefore - Archive of obsolete content
« xul reference home resizebefore type: one of the values below this attribute indicates which element to the left or above the splitter should be resized when the splitter is repositioned.

Element: beforescriptexecute event - Web APIs
the beforescriptexecute event is fired when a script is about to be executed.

Index - Web APIs
a fetch request) before it has completed.
...this can be used to adjust your app's resource usage to reduce battery drain when the battery is low, or to save changes before the battery runs out in order to prevent data loss.
...requests are guaranteed to be initiated before a page is unloaded and they are run to completion, without requiring a blocking request (for example xmlhttprequest).
...And 101 more matches

Observer Notifications
final-ui-startup triggered just before the first window for the application is displayed.
... profile-before-change called just before the profile is lost.
... profile-before-change-qm called to shut down the quotamanager; this is separated from profile-before-change to allow everything inside profile-before-change to continue using it.
...And 20 more matches

Index - Archive of obsolete content
as a result, if, for example, c++ code called a javascript component, which threw an exception, that exception would be logged to the console before control was returned to the c++ caller.
...the namespace currently lives in the future and must be imported before it is used: 512 settings the jetpack.storage.settings namespace allows jetpacks to specify user-configurable settings.
...browsers, like internet explorer 4, that were built before the conception of w3c standards inherited many quirks.
...And 16 more matches

sslfnc.html
before calling nss_init, your program must call pr_init.
... before calling nss_initreadwrite, your program must call pr_init.
... before calling nss_nodb_init, your program must call pr_init.
...And 16 more matches

Menu - Archive of obsolete content
because it is still under development, the api currently lives in the future and must be imported before it is used: jetpack.future.import("menu"); menus all menus in jetpack are jetpack.menu objects, including both built-in firefox menus and menus that features create.
... properties property type description beforehide function a function invoked just before the menu is hidden.
... if the menu is a context menu, it is called as beforehide(menu, context) and otherwise as beforehide(menu).
...And 15 more matches

Introduction to Public-Key Cryptography - Archive of obsolete content
the sender encrypts, or scrambles, information before sending it.
... to get a driver's license, you typically apply to a government agency, such as the department of motor vehicles, which verifies your identity, your ability to drive, your address, and other information before issuing the license.
... to get a student id, you apply to a school or college, which performs different checks (such as whether you have paid your tuition) before issuing the id.
...And 14 more matches

WebRequest.jsm
usage to import webrequest, use code like: let {webrequest} = cu.import("resource://gre/modules/webrequest.jsm", {}); the webrequest object has the following properties, each of which corresponds to a specific stage in executing a web request: onbeforerequest onbeforesendheaders onsendheaders onheadersreceived onresponsestarted oncompleted each of these objects defines two functions: addlistener(callback, filter, opt_extrainfospec) removelistener(callback) adding listeners use addlistener to add a listener to a particular event.
... in particular, "blocking" may be passed to several event types, and will make the event dispatch synchronous, so the browser will wait for the event listener to return before continuing with the request.
...this tells the browser to wait for your event listener to return before continuing with the request.
...And 14 more matches

NSS environment variables
before 3.0 nss_allow_weak_signature_alg boolean (any non-empty value to enable) enables the use of md2 and md4 inside signatures.
... this was allowed by default before nss 3.12.3.
... 3.4 nss_strict_nofork string ("1", "disabled", or any other non-empty value) it is an error to try to use a pkcs#11 crypto module in a process before it has been initialized in that process, even if the module was initialized in the parent process.
...And 14 more matches

Drawing graphics - Learn web development
getting the canvas context and final setup we need to do one final thing before we can consider our canvas template finished.
... let's do one last thing before we move on.
... before calling fill(), we draw a line to the center of the circle.
...And 13 more matches

Animated PNG graphics
conceptually, each frame is constructed in the output buffer before being composited onto the canvas.
... error handling apng is designed to allow incremental display of frames before the entire image has been read.
...a decoder which detects an error before the animation has started should display the default image.
...And 12 more matches

Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
executes a specified block of code before the browser next repaints the display, allowing an animation to be run at a suitable framerate regardless of the environment it is being run in.
... it's important to know that you can (and often will) run other code before a settimeout() call executes, or between iterations of setinterval().
... settimeout() as we said before, settimeout() executes a particular block of code once after a specified time has elapsed.
...And 11 more matches

nsIHttpChannel
this attribute may only be set before the channel is opened.
... this attribute may only be set before the channel is opened.
... this attribute may only be set before the channel is opened.
...And 11 more matches

Using IndexedDB - Web APIs
if you need to save that information, you should read it out and save it somewhere else before upgrading the database.) trying to create an object store with a name that already exists (or trying to delete an object store with a name that does not already exist) will throw an error.
... objectstore.createindex("email", "email", { unique: true }); // use transaction oncomplete to make sure the objectstore creation is // finished before adding data into it.
... adding, retrieving, and removing data before you can do anything with your new database, you need to start a transaction.
...And 11 more matches

nsIContentPolicy - Archive of obsolete content
these types are mapped to type_subdocument before being passed into the implementation of the content policy and should not be used outside gecko code.
... important: this type is mapped to type_script before being passed to content policy implementations, and should not be used outside gecko core code.
... important: this type is mapped to type_script before being passed to content policy implementations, and should not be used outside gecko core code.
...And 10 more matches

WebIDL bindings
if you also inherit from nsisupports, make sure the nsisupports comes before the nswrappercache in your list of parent classes.
...this comes after all idl arguments, but before the errorresult&, if any, for the method.
...this comes after all idl arguments, but before the errorresult&, if any, for the method.
...And 10 more matches

Box-shadow generator - CSS: Cascading Style Sheets
ype="move-up"> </div> <div class="button" data-type="move-down"> </div> </div> <div id="stack_container"></div> </div> <div id="preview_zone"> <div id="layer_menu" class="col span_12"> <div class="button" id="element" data-type="subject" data-title="element"> element </div> <div class="button" id="before" data-type="subject" data-title=":before"> :before <span class="delete" data-type="disable"></span> </div> <div class="button" id="after" data-type="subject" data-title=":after"> :after <span class="delete" data-type="disable"></span> </div> <div class="u...
...i-checkbox" data-topic='before' data-label=":before"></div> <div class="ui-checkbox" data-topic='after' data-label=":after"></div> </div> <div id="preview"> <div id="obj-element"> <div class="content"> </div> <div id="obj-before"> </div> <div id="obj-after"> </div> </div> </div> </div> </div> <div id="controls" class="group section"> <div class="wrap-left"> <div class="colorpicker category"> <div class="title"> </div> <div id="colorpicker" class="group"> <div id="gradient" class="gradient"> <div id="gradient_picker"> </div> ...
...s="menu"></div> <div class="title"> css code </div> <div class="group" style="border-top-left-radius: 0;"> <div class="output" data-topic="element" data-name="element" data-prop="width height background-color position=[relative] box-shadow"> </div> <div class="output" data-topic="before" data-name="element:before" data-prop="content=[&quot;&quot;] position=[absolute] width height top left z-index background-color box-shadow transform -webkit-transform -ms-transform"> </div> <div class="output" data-topic="after" data-name="element:after" data-prop="content=[&quot;&quot;] position=[absolute] w...
...And 10 more matches

Event reference
beforeunload the window, the document and its resources are about to be unloaded.
... transitionrun a css transition has begun running (fired before any delay starts).
... form events event name fired when reset the reset button is pressed submit the submit button is pressed printing events event name fired when beforeprint the print dialog is opened afterprint the print dialog is closed text composition events event name fired when compositionstart the composition of a passage of text is prepared (similar to keydown for a keyboard input, but works with other inputs such as speech recognition).
...And 10 more matches

UI pseudo-classes - Learn web development
styling inputs based on whether they are required or not one of the most basic concepts with regards to client-side form validation is whether a form input is required (it has to be filled in before the form can be submitted) or optional.
... <input>, <select>, and <textarea> elements have a required attribute available which, when set, means that you have to fill in that control before the form will successfully submit.
... the idea is that we can use the ::before and ::after pseudo-elements along with the content property to make a chunk of content appear before or after the affected element.
...And 9 more matches

AsyncShutdown.jsm
for instance, at the end of phase profilebeforechange, no service is permitted to write to the profile directory (with the exception of telemetry).
... consequently, if any service has requested i/o to the profile directory before or during phase profilebeforechange, the system must be informed that these requests need to be completed before the end of phase profilebeforechange.
... example at some point during shutdown, the add-on manager needs to ensure that all add-ons have safely written their data to disk, before writing its own data.
...And 9 more matches

CustomizableUI.jsm
onwidgetbeforedomchange(anode, anextnode, acontainer, aisremoval) fired before a widget's dom node is acted upon by customizableui (to add, move or remove it).
... anode is the dom node changed, anextnode the dom node (if any) before which a widget will be inserted, acontainer the actual dom container (could be an overflow panel in case of an overflowable toolbar), and awasremoval is true iff the action about to happen is the removal of the dom node.
... onwidgetafterdomchange(anode, anextnode, acontainer, awasremoval) like onwidgetbeforedomchange, but fired after the change to the dom node of the widget.
...And 9 more matches

Index
please read these instructions carefully before attempting to build.
... usage and examples creating database files before any operations can be performed, there must be a set of security databases available.
...files destined for the temporary directory are guaranteed to be in place before any executable file is run; they are not deleted until all executable files have finished.
...And 9 more matches

Bytecode Descriptions
subsequent initprop instructions must fill in all slots of the new object before it is used in any other way.
...this is the last thing an async function does before suspending for an await expression.
...(if this async call hasn't awaited before, the caller may be user code.
...And 9 more matches

Window - Web APIs
window.onbeforeinstallprompt an event handler property dispatched before a user is prompted to save a web site to a home screen on mobile.
... window.onmozbeforepaint an event handler property for the mozbeforepaint event, which is sent before repainting the window if the event has been requested by a call to the window.mozrequestanimationframe() method.
... windoweventhandlers.onbeforeprint called when the print dialog box is opened.
...And 9 more matches

Splitters - Archive of obsolete content
you can place a splitter anywhere you want and it will allow resizing of the elements that come before it and the elements that come after it in the same box.
... the syntax of a splitter is as follows: <splitter id="identifier" state="open" collapse="before" resizebefore="closest" resizeafter="closest"> the attributes are as follows: id the unique identifier of the splitter.
...set this to before for the element before the splitter, or after for the element after the splitter.
...And 8 more matches

What is JavaScript? - Learn web development
if the javascript loads and tries to run before the html and css it is affecting has been loaded, errors can occur.
... note: this is a very common error — you need to be careful that the objects referenced in your code exist before you try to do stuff to them.
...you don't have to transform the code into a different form before the browser runs it.
...And 8 more matches

Handling common JavaScript problems - Learn web development
fixing general javascript problems as we said in the previous article on html/css, you should make sure your code is working generally, before going on to concentrate on the cross-browser issues.
... if you are not already familiar with the basics of troubleshooting javascript, you should study that article before moving on.
...when clicked, each one should alert a message containing its number (the value of i at the time it was created), however each one reports i as 11, because for loops do all their iterating before nested functions are invoked.
...And 8 more matches

content - CSS: Cascading Style Sheets
annot be combined with other values */ content: normal; content: none; /* <image> values */ content: url("http://www.example.com/test.png"); content: linear-gradient(#e66465, #9198e5); /* alt text for generated content, added in the level 3 specification */ content: url("http://www.example.com/test.png") / "this is the alt text"; /* values below can only be applied to generated content using ::before and ::after */ /* <string> value */ content: "prefix"; /* <counter> values */ content: counter(chapter_counter); content: counters(section_counter, "."); /* attr() value linked to the html attribute value */ content: attr(value string); /* language- and position-dependent keywords */ content: open-quote; content: close-quote; content: no-open-quote; content: no-close-quote; /* except for nor...
... normal computes to none for the ::before and ::after pseudo-elements.
... accessibility support for css generated content – tink explanation of wcag, guideline 1.3 – mdn understanding success criterion 1.3.1 | w3c understanding wcag 2.0 formal definition initial valuenormalapplies to::before and ::after pseudo-elementsinheritednocomputed valueon elements, always computes to normal.
...And 8 more matches

Template and Tree Listeners - Archive of obsolete content
the primary use of this listener is to store some state before the template is rebuilt and restore it afterwards.
...the willrebuild method of any listeners will be called before the content is removed, and didrebuild method will be called when the content has been regenerated.
... this listener will also work for tree builders, and will call the appropriate methods before and after the tree has been generated.
...And 7 more matches

How to build custom form controls - Learn web development
design, structure, and semantics before building a custom control, you should start by figuring out exactly what you want.
...creating new controls is not that easy, especially if you are creating something that has not been done before, and therefore which nobody has the slightest idea of what the expected behaviors and interactions are.
... at least select has been done before, so we know how it should behave!
...And 7 more matches

Index - Learn web development
for example, take the following line of content: 40 how the web works beginner, client, dns, http, ip, infrastructure, learn, server, tcp, l10n:priority this theory is not essential to writing web code in the short term, but before long you'll really start to benefit from understanding what's happening in the background.
... assets, beginner, composing, content, deprecated, design, fonts, learn, simple, l10n:priority, step by step before doing anything, you need some ideas.
...you should understand these concepts before working through the other articles in the module.
...And 7 more matches

Shell global objects
before returning, fun is called with the return value of the interrupt handler.
...if fun is not careful, hook could be asked to retrieve the source code for compilations that occurred long before it was set, and that it knows nothing about.
...when abouttooverflow is true, marks the store buffer as about-to-overflow before collecting.
...And 7 more matches

IAccessibleText
this enum is used in textbeforeoffset(), textatoffset(), and textafteroffset().
...startoffset, [in] long endoffset, [out] bstr text ); [propget] hresult textafteroffset([in] long offset, [in] enum ia2textboundarytype boundarytype, [out] long startoffset, [out] long endoffset, [out] bstr text ); [propget] hresult textatoffset([in] long offset, [in] enum ia2textboundarytype boundarytype, [out] long startoffset, [out] long endoffset, [out] bstr text ); [propget] hresult textbeforeoffset([in] long offset, [in] enum ia2textboundarytype boundarytype, [out] long startoffset, [out] long endoffset, [out] bstr text ); methods addselection() adds a text() selection().
...three" and a child text() object containing "two" and if the caret is in the descendant object just before the 'o' in "two", then: the caretoffset for the "one ?
...And 7 more matches

splitter - Archive of obsolete content
« xul reference home [ examples | attributes | properties | methods | related ] an element which should appear before or after an element inside a container.
... attributes collapse, resizeafter, resizebefore, state, substate style classes tree-splitter examples <!-- this bar has some styling associated with it.
... before when the grippy is clicked, the element immediately before the splitter in the same parent is collapsed so that its width or height is 0.
...And 6 more matches

Index - MDN Web Docs Glossary: Definitions of Web-related terms
(firefox os was also often called boot2gecko before the project had an official name.) 38 bootstrap bootstrap, css, glossary, intro, framework bootstrap is a free, open source html, css, and javascript framework for quickly building responsive websites.
...gzip is commonly supported by web servers and modern browsers, meaning that servers can automatically compress files with gzip before sending them, and browsers can uncompress files upon receiving them.
...opera uses blink as its layout engine since 2013 (before that, presto).
...And 6 more matches

Pseudo-classes and pseudo-elements - Learn web development
article p:first-child::first-line { font-size: 120%; font-weight: bold; } generating content with ::before and ::after there are a couple of special pseudo-elements, which are used along with the content property to insert content into your document using css.
...you could also change the ::before pseudo-element to ::after and see the text inserted at the end of the element instead of the beginning.
... in this next example, we have added an empty string using the ::before pseudo-element.
...And 6 more matches

Drawing and Event Handling - Plugins
npn_invalidaterect: invalidate an area in a windowless plug-in before repainting or refreshing.
... npn_invalidateregion: invalidate a region in a windowless plug-in before repainting or refreshing.
...in this case, before the browser displays any print dialog boxes, npp_print is called with printinfo->mode equal to np_full.
...And 6 more matches

Using microtasks in JavaScript with queueMicrotask() - Web APIs
a microtask is a short function which is executed after the function or program which created it exits and only if the javascript execution stack is empty, but before returning control to the event loop being used by the user agent to drive the script's execution environment.
...this lets the given function run without the risk of interfering with another script's execution, yet also ensures that the microtask runs before the user agent has the opportunity to react to actions taken by the microtask.
... second, if a microtask adds more microtasks to the queue by calling queuemicrotask(), those newly-added microtasks execute before the next task is run.
...And 6 more matches

test/utils - Archive of obsolete content
usage before and after helper functions before() and after() are available for running a function before or after each test in a suite.
... they're useful when you need to guarantee a particular state before running a test, and to clean up after your test.
... let { before, after } = require('sdk/test/utils'); let { search } = require('sdk/places/bookmarks'); exports.testcountbookmarks = function (assert, done) { search().on('end', function (results) { assert.equal(results, 0, 'should be no bookmarks'); done(); }); }; before(exports, function (name, assert) { removeallbookmarks(); }); require('sdk/test').run(exports); both before and after may be asynchronous.
...And 5 more matches

create fancy boxes - Learn web development
before we start getting into the practical side of it, make sure you are familiar with the css box model.
... its pseudo-element: ::before and ::after and some aside properties like: box-shadow, transform, outline, etc.
... before we jump to some practical examples, let's step back a bit as there are two things you should know about backgrounds.
...And 5 more matches

Looping code - Learn web development
a condition — as mentioned before, this defines when the loop should stop looping.
... exiting loops with break if you want to exit a loop before all the iterations have been completed, you can use the break statement.
... we store the value entered into the text input in a variable called searchname, before then emptying the text input and focusing it again, ready for the next search.
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Focus management with Vue refs - Learn web development
you might now be thinking "hey, don’t we set isediting=false before we try to access the ref, so therefore shouldn't the v-if now be displaying the button?” this is where the virtual dom comes into play.
...this lifecycle spans from all the way before elements are created and added to the vdom (mounted), until they are removed from the vdom (destroyed).
...this can be useful for things like data fetching, where you may need to get your data before your component renders, or after a property changes.
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IME handling guide
it handles native key events before or after focused application (depending on the platform) and creates a composition string (a.k.a.
... mranges representing dom event ecompositionstart selected string before starting composition textcomposition nullptr compositionstart ecompositionupdate new composition string textcomposition nullptr compositionupdate ecompositionend commit string textcomposition nullptr compositionend ecompositionchange new composition string widget (or textcomposition) must not be nullptr text ecomposi...
... and before dispatching ecomposition* events, this class removes ascii control characters from dispatching composition event's data in the default settings.
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OS.File for the main thread
using os.file from a jsm to import os.file into your chrome code, add the following line at the start of your script: components.utils.import("resource://gre/modules/osfile.jsm") promises before using os.file from the main thread, you need some understanding of the promise library.
... append if true, the file will be opened for appending, meaning the equivalent of .setposition(0, pos_end) is executed before each write.
... file.close(); this example is from stackoverflow: os.file check last modified date before os.read os.file.openunique() creates and opens a file with a unique name.
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NSS Tools modutil
files destined for the temporary directory are guaranteed to be in place before any executable file is run; they are not deleted until all executable files have finished.
...if communicator iscurrently running, you should exit communicator before continuing thisoperation.
...if communicator iscurrently running, you should exit communicator before continuing thisoperation.
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TPS Bookmark Lists
before: the title of the bookmark item expected to be found before this bookmark; used only in verify and modify actions.
...before: the title of the bookmark item expected to be found before this livemark; used only in verify and modify actions.
...before: the title of the bookmark item expected to be found before this folder; used only in verify and modify actions.
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Index
an nscomptr always calls release before letting go, whether the nscomptr is letting go so that it can point to a different object, or because the nscomptr is going out of scope.
...if you've never use nscomptrs before, you might want to read the getting started guide first.
...if the referent object is destroyed before the weak reference, the pointer inside the weak reference is set to nsnull.
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nsITreeView
method overview boolean candrop(in long index, in long orientation, in nsidomdatatransfer datatransfer); boolean candropbeforeafter(in long index, in boolean before); obsolete since gecko 1.8 boolean candropon(in long index); obsolete since gecko 1.8 void cyclecell(in long row, in nsitreecolumn col); void cycleheader(in nsitreecolumn col); void drop(in long row, in long orientation, in nsidomdatatransfer datatransfer); astring getcellproperties(in long row, in nsitreecolumn co...
... constants constant value description progress_normal 1 note: renamed from progressnormal in gecko 1.8 progress_undetermined 2 note: renamed from progressundetermined in gecko 1.8 progress_none 3 note: renamed from progressnone in gecko 1.8 drop_before -1 drop_on 0 drop_after 1 indropbefore 0 obsolete since gecko 1.8 indropon 1 obsolete since gecko 1.8 indropafter 2 obsolete since gecko 1.8 methods candrop() methods used by the drag feedback code to determine if a drag is allowable at the current location.
... candropbeforeafter() obsolete since gecko 1.8 (firefox 1.5 / thunderbird 1.5 / seamonkey 1.0) method used by the drag feedback code to determine if a drag is allowable at the current location.
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PerformanceResourceTiming - Web APIs
performanceresourcetiming.workerstartread only returns a domhighrestimestamp immediately before dispatching the fetchevent if a service worker thread is already running, or immediately before starting the service worker thread if it is not already running.
... performanceresourcetiming.fetchstartread only a domhighrestimestamp immediately before the browser starts to fetch the resource.
... performanceresourcetiming.domainlookupstartread only a domhighrestimestamp immediately before the browser starts the domain name lookup for the resource.
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SVGLengthList - Web APIs
note: starting in gecko 5.0,the svglengthlist dom interface is now indexable and can be accessed like arrays interface overview also implement none methods void clear() svglength initialize(in svglength newitem) svglength getitem(in unsigned long index) svglength insertitembefore(in svglength newitem, in unsigned long index) svglength replaceitem(in svglength newitem, in unsigned long index) svglength removeitem(in unsigned long index) svglength appenditem(in svglength newitem) properties readonly unsigned long numberofitems readonly unsigned long length normative document svg 1.1 (2nd edition) pro...
...if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... insertitembefore(in svglength newitem, in unsigned long index) svglength inserts a new item into the list at the specified position.
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SVGNumberList - Web APIs
interface overview also implement none methods void clear() svgnumber initialize(in svgnumber newitem) svgnumber getitem(in unsigned long index) svgnumber insertitembefore(in svgnumber newitem, in unsigned long index) svgnumber replaceitem(in svgnumber newitem, in unsigned long index) svgnumber removeitem(in unsigned long index) svgnumber appenditem(in svgnumber newitem) properties readonly unsigned long numberofitems readonly unsigned long length normative document svg 1.1 (2nd edition) ...
...if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... insertitembefore(in svgnumber newitem, in unsigned long index) svgnumber inserts a new item into the list at the specified position.
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SVGPathSegList - Web APIs
interface overview also implement none methods void clear() svgpathseg initialize(in svgpathseg newitem) svgpathseg getitem(in unsigned long index) svgpathseg insertitembefore(in svgpathseg newitem, in unsigned long index) svgpathseg replaceitem(in svgpathseg newitem, in unsigned long index) svgpathseg removeitem(in unsigned long index) svgpathseg appenditem(in svgpathseg newitem) properties readonly unsigned long numberofitems ...
...if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... insertitembefore(in svgpathseg newitem, in unsigned long index) svgpathseg inserts a new item into the list at the specified position.
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SVGPointList - Web APIs
interface overview also implement none methods void clear() svgpoint initialize(in svgpoint newitem) svgpoint getitem(in unsigned long index) svgpoint insertitembefore(in svgpoint newitem, in unsigned long index) svgpoint replaceitem(in svgpoint newitem, in unsigned long index) svgpoint removeitem(in unsigned long index) svgpoint appenditem(in svgpoint newitem) properties readonly unsigned long numberofitems n...
...if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... insertitembefore(in svgpoint newitem, in unsigned long index) svgpoint inserts a new item into the list at the specified position.
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SVGStringList - Web APIs
interface overview also implement none methods void clear() domstring initialize(in domstring newitem) domstring getitem(in unsigned long index) domstring insertitembefore(in domstring newitem, in unsigned long index) domstring replaceitem(in domstring newitem, in unsigned long index) domstring removeitem(in unsigned long index) domstring appenditem(in domstring newitem) properties readonly unsigned long numberofitems readonly unsigned long length normative document svg 1.1 (2nd edition) ...
...if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... insertitembefore(in domstring newitem, in unsigned long index) domstring inserts a new item into the list at the specified position.
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SVGTransformList - Web APIs
note: starting in gecko 9.0,the svgtransformlist dom interface is now indexable and can be accessed like arrays interface overview also implement none methods void clear() svgtransform initialize(in svgtransform newitem) svgtransform getitem(in unsigned long index) svgtransform insertitembefore(in svgtransform newitem, in unsigned long index) svgtransform replaceitem(in svgtransform newitem, in unsigned long index) svgtransform removeitem(in unsigned long index) svgtransform appenditem(in svgtransform newitem) svgtransform createsvgtransformfrommatrix(in svgmatrix) svgtransform consolidate() properties readonly unsigned long numbe...
...if the inserted item is already in a list, it is removed from its previous list before it is inserted into this list.
... insertitembefore(in svgtransform newitem, in unsigned long index) svgtransform inserts a new item into the list at the specified position.
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Value definition syntax - CSS: Cascading Style Sheets
bold [ thin && <length> ] this example matches the following values: bold thin 2vh bold 0 thin bold thin 3.5em but not: thin bold 3em, as bold is juxtaposed with the component defined by the brackets, it must appear before it.
...it describes bold, thin <length>, bold thin <length>, or thin <length> bold but not <length> bold thin as bold, if not omitted, must be placed before or after the whole thin && <length> component.
... but not: smaller, as bold is juxtaposed, and must appear before any smaller keyword.
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Chapter 5: Let's build a Firefox extension - Archive of obsolete content
change your preferences for more efficient development before you get to work developing your extension, you’ll want to change some of your firefox preferences.
...the insertbefore attribute determines where the element gets added.
... listing 3: additional content for overlay.xul <?xml version="1.0"?> <overlay id="helloworldoverlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <menupopup id="menu_toolspopup"> <menuitem id="helloworldmenuitem" label="hello, world!" insertbefore="sanitizeseparator" oncommand="window.opendialog('chrome://helloworld/content/clock.xul','clock','chrome,centerscreen,modal');"/> </menupopup> </overlay> phase 2: adding a function to display the time in phase 2, we will make it so that selecting the hello world menu item we created in phase 1 will display a window with the time (figure 6).
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Positioning - Archive of obsolete content
for instance: <menupopup id="edititems" position="end_before"> <menuitem label="cut"/> <menuitem label="copy"/> <menuitem label="paste"/> </menupopup> <label value="clipboard" popup="edititems"/> in this example, a menupopup is attached to a label via the popup attribute, which will cause the popup to appear when the label is left-clicked.
... the position attribute is used to specify that the popup should appear at the 'end_before' location, which will cause the popup to appear to the right of the label aligned along the top edge.
... single word alignment values example before_start the left side of the popup is aligned with the left side of the anchor, and the bottom of the popup is aligned along the top of the anchor.
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Client-side storage - Learn web development
next, add the following to the bottom of your code: window.onload = function() { }; we will write all of our subsequent code inside this window.onload event handler function, called when the window's load event fires, to make sure we don't try to use indexeddb functionality before the app has completely finished loading (it could fail if we don't).
...this is equivalent to the line db = request.result; inside the onsuccess handler, but we need to do this separately here because the onupgradeneeded handler (if needed) will run before the onsuccess handler, meaning that the db value wouldn't be available if we didn't do this.
...this creates a request object, in the same fashion as we've seen before.
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Componentizing our React app - Learn web development
before we can make it do things, we need to break it apart into manageable, descriptive components.
... make a <todo /> before we can make a component, we should create a new file for it.
...make sure you're in the root of your app before you run these!
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Command line crash course - Learn web development
before you go any further, open your terminal program!
... we’ve alluded to this before, but to be clear — you need to be careful with the terminal.
... simple commands do not carry too much danger, but as you start putting together more complex commands, you need to think carefully about what the command will do, and try testing them out first before you finally run them in the intended directory.
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Introducing a complete toolchain - Learn web development
in addition, you should include tests before you deploy to your production server to ensure your software works as intended — this already sounds like a necessary toolchain.
...however, this project has only 4 svg images, which were manually minified using svgo before adding them to the project.
...let's take this opportunity to make sure we are set up with them before we continue.
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HTML parser threading
parser termination is checked before each tree op for an early return, because, unfortunately, gecko expects parsers to be able to terminate immediately.
...if too much time has been spent, a runnable for calling runflushloop() again is dispatched and an early return made before all tree ops have been executed.
...the line number and the snapshot are also added to the tree op that attempts to execute scripts (before flushing it).
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Download
whether partial data can actually be retained depends on the saver and the download source, and may not be known before the download is started.
...the default value is null before the download starts.
... totalbytes read only number when hasprogress is true, this indicates the total number of bytes to be transferred before the download finishes; this value can be zero if the file is empty.
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NSS tools : signtool
for example, if you are a software developer, you should test your code to make sure it is virus-free before signing it.
... similarly, if you are a network administrator, you should make sure, before signing any code, that it comes from a reliable source and will run correctly with the software installed on the machines to which you are distributing it.
... before you can use netscape signing tool to sign files, you must have an object-signing certificate, which is a special certificate whose associated private key is used to create digital signatures.
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Index
ation will then be retried (and may still fail.) 68 js::setoutofmemorycallback jsapi reference, reference, référence(2), spidermonkey unlike the error reporter, which is only called if the exception for an oom bubbles up and is not caught, the js::outofmemorycallback is called immediately at the oom site to allow the embedding to capture the current state of heap allocation before anything is freed.
... if the large-allocation-failure callback is called at all (not all allocation sites call the large-allocation-failure callback on failure), it is called before the out-of-memory callback; the out-of-memory callback is only called if the allocation still fails after the large-allocation-failure callback has returned.
... 96 jsenumerateop jsapi reference, spidermonkey jsenumerateop is called just before an object is enumerated (via a for...in statement, an array comprehension, or a call to js_enumerate).
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KeyboardEvent.key - Web APIs
if the key produces a character key that would result in a character being inserted into possibly an <input>, <textarea> or an element with htmlelement.contenteditable set to true, the beforeinput and input event types are fired in that order.
...g'), btnclearconsole = document.getelementbyid('btn-clear-console'); function logmessage(message) { document.getelementbyid("console-log").innerhtml += message + "<br>"; } textarea.addeventlistener('keydown', (e) => { if (!e.repeat) logmessage(`key "${e.key}" pressed [event: keydown]`); else logmessage(`key "${e.key}" repeating [event: keydown]`); }); textarea.addeventlistener('beforeinput', (e) => { logmessage(`key "${e.data}" about to be input [event: beforeinput]`); }); textarea.addeventlistener('input', (e) => { logmessage(`key "${e.data}" input [event: input]`); }); textarea.addeventlistener('keyup', (e) => { logmessage(`key "${e.key}" released [event: keyup]`); }); btnclearconsole.addeventlistener('click', (e) => { let child = consolelog.firstchild; while...
... (child) { consolelog.removechild(child); child = consolelog.firstchild; } }); result note: on browsers that don't fully implement the inputevent interface which is used for the beforeinput and input events, you may get incorrect output on those lines of the log output.
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Advanced techniques: Creating and sequencing audio - Web APIs
the key here is connecting the graph correctly, and also starting both oscillators: lfo.connect(amp.gain); osc.connect(amp).connect(audioctx.destination); lfo.start(); osc.start(); osc.stop(audioctx.currenttime + pulsetime); note: we also don't have to use the default wave types for either of these oscillators we're creating — we could use a wavetable and the periodic wave method as we did before.
...one will change the tone and the other will change how the pulse modulates the first wave: <label for="hz">hz</label> <input name="hz" id="hz" type="range" min="660" max="1320" value="880" step="1" /> <label for="lfo">lfo</label> <input name="lfo" id="lfo" type="range" min="20" max="40" value="30" step="1" /> as before, we'll vary the parameters when the range input values are changed by the user.
... wiring this up is the same as we've seen before.
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Cognitive accessibility - Accessibility
timers options for adjusting time requirements include: allowing the user to turn off or adjust the time to at least 10 times the original limit before encountering it.
...before re-authenticating, encode the data as hidden or encrypted.
...also be sure to provide a submit button to initiate the change of context, and describe what will happen before the change is made.
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Proxy Auto-Configuration (PAC) file - HTTP
examples shexpmatch("http://home.netscape.com/people/ari/index.html" , "*/ari/*"); // returns true shexpmatch("http://home.netscape.com/people/montulli/index.html", "*/ari/*"); // returns false weekdayrange() syntax weekdayrange(wd1, wd2, [gmt]) note: (before firefox 49) wd1 must be less than wd2 if you want the function to evaluate these parameters as a range.
... the order of the days matters; before firefox 49, weekdayrange("sun", "sat") will always evaluate to true.
... daterange(<day> | <month> | <year>, [gmt]) // ambiguity is resolved by assuming year is greater than 31 daterange(<day1>, <day2>, [gmt]) daterange(<month1>, <month2>, [gmt]) daterange(<year1>, <year2>, [gmt]) daterange(<day1>, <month1>, <day2>, <month2>, [gmt]) daterange(<month1>, <year1>, <month2>, <year2>, [gmt]) daterange(<day1>, <month1>, <year1>, <day2>, <month2>, <year2>, [gmt]) note: (before firefox 49) day1 must be less than day2, month1 must be less than month2, and year1 must be less than year2 if you want the function to evaluate these parameters as a range.
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Expressions and operators - JavaScript
a binary operator requires two operands, one before the operator and one after the operator: operand1 operator operand2 for example, 3+4 or x*y.
... a unary operator requires a single operand, either before or after the operator: operator operand or operand operator for example, x++ or ++x.
... note that the return values are always based on the operands’ values before the operation.
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String.prototype.replace() - JavaScript
let str = 'twas the night before xmas...'; let newstr = str.replace(/xmas/i, 'christmas'); console.log(newstr); // twas the night before christmas...
... this logs 'twas the night before christmas...'.
... using an inline function that modifies the matched characters in this example, all occurrences of capital letters in the string are converted to lower case, and a hyphen is inserted just before the match location.
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Add to Home screen - Progressive web apps (PWAs)
also, be aware that chrome requires this before it will display the install banner, whereas firefox doesn't require it for showing the home-with-a-plus icon.
...when this happens, supporting browsers will fire a beforeinstallprompt event.
... we can then use a handler like the one below to handle the installation: window.addeventlistener('beforeinstallprompt', (e) => { // prevent chrome 67 and earlier from automatically showing the prompt e.preventdefault(); // stash the event so it can be triggered later.
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alignment-baseline - SVG: Scalable Vector Graphics
as a presentation attribute, it can be applied to any element but it has effect only on the following four elements: <tspan>, <tref>, <altglyph>, and <textpath> usage notes value auto | baseline | before-edge | text-before-edge | middle | central | after-edge | text-after-edge | ideographic | alphabetic | hanging | mathematical | top | center | bottom default value auto animatable yes auto the value is the dominant-baseline of the script to which the character belongs - i.e., use the dominant-baseline of the parent.
... before-edge the alignment-point of the object being aligned is aligned with the "before-edge" baseline of the parent text content element.
... text-before-edge the alignment-point of the object being aligned is aligned with the "text-before-edge" baseline of the parent text content element.
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panel - Archive of obsolete content
a panel's content is loaded as soon as it is created, before the panel is shown, and the content remains loaded when a panel is hidden, so it is possible to keep a panel around in the background, updating its content as appropriate in preparation for the next time it is shown.
... content scripts specified by this property are loaded before those specified by the contentscript property.
... stylesheets specified by this property are loaded before those specified by the contentstyle property.
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lang/functional - Archive of obsolete content
let { defer } = require("sdk/lang/functional"); let fn = defer(function myevent (event, value) { console.log(event + " : " + value); }); fn("click", "#home"); console.log("done"); // this will print 'done' before 'click : #home' since // we deferred the execution of the wrapped `myevent` // function, making it non-blocking and executing on the // next event loop parameters fn : function the function to be deferred.
... wrap(fn, wrapper) returns the first function passed as an argument to the second, allowing you to adjust arguments, run code before and after, and conditionally execute the original function.
... let { wrap } = require("sdk/lang/functional"); let wrappedhello = wrap(hello, function (fn, name) { return "before, " + fn(name) + "after"; }); wrappedhello("moe"); // "before, hello: moe, after" function hello (name) { return "hello: " + name; } parameters fn : function the function to be passed into the wrapper function.
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Creating custom Firefox extensions with the Mozilla build system - Archive of obsolete content
note: with the modern jit javascript engine in gecko and js-ctypes more extension code can be written only in javascript than ever before.
... please consider all of your options carefully before deciding to use native code (c++) in your extension.
... note that before actually building anything, the mozilla build system invokes a configuration process that generates the actual makefiles used for the build from makefile templates called makefile.in.
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Adding Toolbars and Toolbar Buttons - Archive of obsolete content
tooltips are very important for users that want to know what a button does before clicking it.
... <window id="main-window"> <toolbox id="navigator-toolbox"> <toolbar id="xulschoolhello-toolbar" toolbarname="&xulschoolhello.toolbarname.label;" accesskey="&xulschoolhello.toolbar.accesskey;" customizable="true" mode="icons" context="toolbar-context-menu" defaultset="xulschoolhello-hello-world-button" insertbefore="personaltoolbar" /> </toolbox> </window> (note for mac os x: <window id="main-window"> and </window> are not required) our toolbar is added as a child of the toolbox element in the main browser window.
... finally, the insertbefore attribute places our toolbar above the bookmarks toolbar.
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Intercepting Page Loads - Archive of obsolete content
there are better ways to intercept page loads before any content is downloaded, and before the user sees anything in the tab.
...you can also use these in conjunction with nsitraceablechannel to get and modify the response text before it gets to the original requester.
... you won't be able to make dom modifications like with the load events, since these notifications are triggered before the response arrives and is parsed into dom tree, so this is not the best approach for the typical greasemonkey-style extensions.
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MMgc - Archive of obsolete content
// before sweeping we check for missing write barriers bool gc::incrementalvalidation = false; // check for missing write barriers at every alloc bool gc::incrementalvalidationpedantic = false; if you suspect you have missing write barriers, turn these switches on in a debug build.
...even with an incremental collector that doesn't have big pauses, a gc sweep only kicks in every so often, so memory usage can grow very quickly to a high peak before the gc collects unused objects.
...the other scenarios we don't care about: gray written to black/gray/white - since the object is gray its on the queue and will be marked before we sweep white written to gray - the white object will be marked as reachable when the gray object is marked white written to white - the referant will either eventually become gray if its reachable or not in which case both objects will get marked black written to black/gray/white - its black, its already been marked so a write barrier needs to be inserted anywhere we could possibly store a poi...
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Index - Archive of obsolete content
28 beforeselected xul attributes, xul reference no summary!
... 162 insertbefore xul attributes, xul reference no summary!
... 216 onbeforeaccept xul attributes, xul reference no summary!
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PopupEvents - Archive of obsolete content
popupshowing this event is fired on a menupopup, panel or tooltip just before it is made visible.
... the popupshowing event just before a popup is about to be displayed, a popupshowing event will fired on the popup.
...within the listener for the popupshowing event, you can append to or modify the menu as needed before it is displayed.
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Static Content - Archive of obsolete content
predicate="http://purl.org/dc/elements/1.1/title" object="?countrytitle"/> </query> <action> <menupopup> <menuitem uri="?country" label="?countrytitle" value="?country"/> </menupopup> </action> </template> </menulist> the only difference between the previous example and this one is that the menulist element has some additional content added before the template.
...that is, before the template is examined, the menulist would have one item in it, with the label 'all'.
... the template generates two results as before, one for each country, and appends a menuitem for each one.
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Audio for Web games - Game development
buffering and preloading likely as an attempt to mitigate runaway mobile network data use, we also often find that buffering is disabled before playback has been initiated.
...however, preloading is still useful — without it, there would always need to be some client-server communication required before playing can commence.
...playing="false" aria-describedby="clavi-play-label"> <span id="clavi-play-label">play</span> </button> </li> </ul> <p class="sourced">all tracks sourced from <a href="http://jplayer.org/">jplayer.org</a></p> </section> all of these tracks are the same tempo and are designed to be synchronized with each other, so we need to make sure they are loaded and available to the api before we are able to play them.
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Styling web forms - Learn web development
before we do that however, we'd like to say a few words about specific aspects of form styling that are worth knowing about.
...as before, however, browsers rely on the system default styles when displaying these widgets.
...before we start coding, we need three additional assets: the postcard background — download this image and save it in the same directory as your working html file.
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Front-end web developer - Learn web development
each section includes exercises and assessments to test your understanding before you move forward.
... if you are not sure if front-end web development is for you, and/or you want a gentle introduction before starting a longer and more complete course, work through our getting started with the web module first.
... modules introduction to html (15–20 hour read/exercises) multimedia and embedding (15–20 hour read/exercises) html tables (5–10 hour read/exercises) styling and layout with css time to complete: 90–120 hours prerequisites it is recommended that you have basic html knowledge before starting to learn css.
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Video and audio content - Learn web development
note: before you begin here, you should also know that there are quite a few ovps (online video providers) like youtube, dailymotion, and vimeo, and online audio providers like soundcloud.
...as we talked about before, different browsers support different video and audio formats, and different container formats (like mp3, mp4, and webm, which in turn can contain different types of video and audio).
... poster the url of an image which will be displayed before the video is played.
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Graceful asynchronous programming with Promises - Learn web development
there are certain steps that you have to take for your order to be successful, which doesn't really make sense to try to execute out of order, or in order but before each previous step has quite finished: you choose what toppings you want.
... }) .then(function(pizza) { eatpizza(pizza); }) .catch(failurecallback); this is much better — it is easier to see what is going on, we only need a single .catch() block to handle all the errors, it doesn't block the main thread (so we can keep playing video games while we wait for the pizza to be ready to collect), and each operation is guaranteed to wait for previous operations to complete before running.
...as we said before, this object represents an intermediate state that is initially neither success nor failure — the official term for a promise in this state is pending.
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Basic math in JavaScript — numbers and operators - Learn web development
you may have encountered these numbers before when setting colors in css.
... before you start to get worried about your brain melting, stop right there!
... first of all, let's declare a couple of variables and initialize them with an integer and a float, respectively, then type the variable names back in to check that everything is in order: let myint = 5; let myfloat = 6.667; myint; myfloat; number values are typed in without quote marks — try declaring and initializing a couple more variables containing numbers before you move on.
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Inheritance in JavaScript - Learn web development
nstructor function the first thing we need to do is create a teacher() constructor — add the following below the existing code: function teacher(first, last, age, gender, interests, subject) { person.call(this, first, last, age, gender, interests); this.subject = subject; } this looks similar to the person constructor in many ways, but there is something strange here that we've not seen before — the call() function.
... we need to do one more thing before we move on.
... we can now instantiate object instances using the new operator, in just the same way as we did before: let han = new person('han', 'solo', 25, 'male', ['smuggling']); han.greeting(); // hi!
...And 3 more matches

Aprender y obtener ayuda - Learn web development
it isn't however very good at getting an understanding of "the big picture", and unlocking new neural pathways when you are trying to understand new subjects or solve new problems that you haven't come across before.
...this is the opposite of focus — you let your brain wander around the wider landscape, searching around for connections you didn't have before, touching on new things (or new combinations of things) that you can then focus on later, to strengthen them and start to really understand what they mean.
... this is why it is usually good to read some introductory material first to get a high-level understanding of an area before you leap into the specific details.
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Website security - Learn web development
these defenses are typically located before or in the web server (they are not part of the web application itself).
...the solution is to sanitize input before using it.
...the solution is to sanitize input before using it.
...And 3 more matches

TypeScript support in Svelte - Learn web development
note: remember that you can run npx degit opensas/mdn-svelte-tutorial/07-typescript-support svelte-todo-typescript to get the complete to-do list application in javascript before you start porting it to typescript.
... as we said before, typescript is a superset of javascript, so your application will run without modifications.
... now from todos.svelte, we will instantiate a todo component with a literal object as its parameter before the call to the moreactions component, like this: <hr /> <todo todo={ { name: 'a new task with no id!', completed: false } } /> <!-- moreactions --> <moreactions {todos} add the lang='ts' to the <script> tag of the todos.svelte component, so that it knows to use the type checking we have specified.
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Setting up your own test automation environment - Learn web development
so here we've done the test as before, except that this time we've wrapped it inside a function, searchtest().
...for example, above we used this construct to tab out of the form input before submitting it: driver.sleep(1000).then(function() { driver.findelement(by.name('q')).sendkeys(webdriver.key.tab); }); waiting for something to complete there are times where you'll want to make webdriver wait for something to complete before carrying on.
... for example if you load a new page, you'll want to wait for the page's dom to finish loading before you try to interact with any of its elements, otherwise the test will likely fail.
...And 3 more matches

Deploying our app - Learn web development
note: cache busting is a new term that we haven't met before in the module.
... this remote location needs to be added to our local git repository before we can push it up there, otherwise it won't be able to find it.
... now we're ready to push our code to github; run the following command now: git push github master at this point you'll be prompted to enter a username and password before git will allow the push to be sent.
...And 3 more matches

Performance best practices for Firefox front-end engineers
note that requestanimationframe() lets you queue up javascript to run right before the style flush occurs.
... this allows you to put all of your dom writes (most importantly, anything that could change the size or position of things in the dom) just before the style and layout steps of the pipeline, combining all the style and layout calculations into a single batch so it all happens once, in a single frame tick, instead of across multiple frames.
...if you must read style information, do so at the very beginning of the frame, before any changes have been made to the dom since the last time a style flush occurred.
...And 3 more matches

Sqlite.jsm
before you can use this module, you need to import it into your scope: components.utils.import("resource://gre/modules/sqlite.jsm") obtaining a connection sqlite.jsm exports the sqlite symbol.
...therefore, caution should be exercised before calling this function.
...the next time this same sql statement is executed (the sql argument is identical to one passed in before), the old statement object is reused.
...And 3 more matches

Mozilla internal string guide
.insert(string, position) - inserts the given string before the code unit at position.
...calling setcapacity() before beginwriting() does not affect what the previous sentence says.
... to make the string longer, call setlength() before beginwriting() or use the bulkwrite() api described below.
...And 3 more matches

nsINavBookmarkObserver
1.0 66 introduced gecko 1.8 inherits from: nsisupports last changed in gecko 21.0 (firefox 21.0 / thunderbird 21.0 / seamonkey 2.18) method overview void onbeforeitemremoved(in long long aitemid, in unsigned short aitemtype, in long long aparentid, in acstring aguid, in acstring aparentguid); obsolete since gecko 21.0 void onbeginupdatebatch(); void onendupdatebatch(); void onfolderadded(in print64 folder, in print64 parent, in print32 index); obsolete since gecko 1.9 void onfolderchanged(in print64 folder, in acstring property); obsolete since gecko 1.9 void onfoldermoved(in print64 folde...
...ted(in long long aitemid, in long long avisitid, in prtime atime, in unsigned long atransitiontype, in nsiuri auri, in long long aparentid, in acstring aguid, in acstring aparentguid); void onseparatoradded(in print64 parent, in print32 index); obsolete since gecko 1.9 void onseparatorremoved(in print64 parent, in print32 index); obsolete since gecko 1.9 methods onbeforeitemremoved() obsolete since gecko 21.0 (firefox 21.0 / thunderbird 21.0 / seamonkey 2.18) note: this method was removed in gecko 21.0 as part of bug 826409.
...it is called before the actual removal takes place.
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nsITextInputProcessor
in other words, when you need to specify modifier key state of dispatching keyboard events, you need to dispatch modifier key events before and after that.
... begininputtransaction() this must be called before starting composition every time.
... begininputtransactionfortests() this must be called before starting composition for automated tests every time.
...And 3 more matches

nsITransactionListener
willbeginbatch() called before a nsitransactionmanager begins a batch.
... return value willdo() called before a nsitransactionmanager calls a transaction's nsitransaction.dotransaction() method.
... return value willendbatch() called before a nsitransactionmanager ends a batch.
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Using images - Web APIs
be sure you've drawn something to the source canvas before using it in your target canvas.
... if you try to call drawimage() before the image has finished loading, it won't do anything (or, in older browsers, may even throw an exception).
... so you need to be sure to use the load event so you don't try this before the image has loaded: var img = new image(); // create new img element img.addeventlistener('load', function() { // execute drawimage statements here }, false); img.src = 'myimage.png'; // set source path if you're only using one external image this can be a good approach, but once you need to track more than one we need to resort to something more clever.
...And 3 more matches

How whitespace is handled by HTML, CSS, and in the DOM - Web APIs
</h1> this source code contains a couple of line feeds after the doctype and a bunch of space characters before, after, and inside the <h1> element, but the browser doesn’t seem to care at all and just shows the words "hello world!" as if these characters didn’t exist at all: this is so that whitespace characters don't impact the layout of your page.
... inside this context, whitespace character processing can be summarized as follows: first, all spaces and tabs immediately before and after a line break are ignored so, if we take our example markup from before and apply this first rule, we get: <h1>◦◦◦hello⏎ <span>◦world!</span>⇥◦◦</h1> next, all tab characters are handled as space characters, so the example becomes: <h1>◦◦◦hello⏎ <span>◦world!</span>◦◦◦</h1> next, line breaks are converted to spaces: <h1>◦◦◦hello�...
...we've marked the whitespace characters as before.
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EffectTiming.fill - Web APIs
the web animations api's effecttiming dictionary's fill property specifies a fill mode, which defines how the element to which the animation is applied should look when the animation sequence is not actively running, such as before the time specified by iterationstart or after animation's end time.
...in this case, we have just two keyframes; the first defines what affect is applied to the element immediately after the animation first begins to play, and the second defines the effect applied to the element in the last moment before it ends.
... var boxrotationtiming = { duration: 2000, iterations: 1, fill: "none" }; the boxrotationtiming object describes how long the animation should take to run, how many times it should run, what state the element should be in before the animation begins and after it ends, and so forth.
...And 3 more matches

Element.insertAdjacentElement() - Web APIs
syntax targetelement.insertadjacentelement(position, element); parameters position a domstring representing the position relative to the targetelement; must match (case-insensitively) one of the following strings: 'beforebegin': before the targetelement itself.
... 'afterbegin': just inside the targetelement, before its first child.
... 'beforeend': just inside the targetelement, after its last child.
...And 3 more matches

Element.insertAdjacentText() - Web APIs
syntax element.insertadjacenttext(position, element); parameters position a domstring representing the position relative to the element; must be one of the following strings: 'beforebegin': before the element itself.
... 'afterbegin': just inside the element, before its first child.
... 'beforeend': just inside the element, after its last child.
...And 3 more matches

EventTarget.addEventListener() - Web APIs
the available options are: capture a boolean indicating that events of this type will be dispatched to the registered listener before being dispatched to any eventtarget beneath it in the dom tree.
... usecapture optional a boolean indicating whether events of this type will be dispatched to the registered listener before being dispatched to any eventtarget beneath it in the dom tree.
... before using a particular value in the options object, it's a good idea to ensure that the user's browser supports it, since these are an addition that not all browsers have supported historically.
...And 3 more matches

HTMLSelectElement.add() - Web APIs
syntax collection.add(item[, before]); parameters item is an htmloptionelement or htmloptgroupelement before is optional and an element of the collection, or an index of type long, representing the item item should be inserted before.
... opt1 = document.createelement("option"); var opt2 = document.createelement("option"); opt1.value = "1"; opt1.text = "option: value 1"; opt2.value = "2"; opt2.text = "option: value 2"; sel.add(opt1, null); sel.add(opt2, null); /* produces the following, conceptually: <select> <option value="1">option: value 1</option> <option value="2">option: value 2</option> </select> */ the before parameter is optional.
... /* takes the existing following select object: <select id="existinglist"> <option value="1">option: value 1</option> <option value="2">option: value 2</option> </select> and changes it to: <select id="existinglist"> <option value="1">option: value 1</option> <option value="2">option: value 2</option> <option value="3">option: value 3</option> </select> */ the before parameter is optional.
...And 3 more matches

PerformanceNavigationTiming - Web APIs
the interface also supports the following properties: performancenavigationtiming.domcomplete read only a domhighrestimestamp representing a time value equal to the time immediately before the browser sets the current document readiness of the current document to complete.
... performancenavigationtiming.domcontentloadedeventstart read only a domhighrestimestamp representing the time value equal to the time immediately before the user agent fires the domcontentloaded event at the current document.
... performancenavigationtiming.dominteractive read only a domhighrestimestamp representing a timestamp representing the time value equal to the time immediately before the user agent sets the current document readiness of the current document to interactive.
...And 3 more matches

Using Service Workers - Web APIs
using a service worker you can easily set an app up to use cached assets first, thus providing a default experience even when offline, before then getting more data from the network (commonly known as offline first).
... sync try { const value = myfunction(); console.log(value); } catch(err) { console.log(err); } async myfunction().then((value) => { console.log(value); }).catch((err) => { console.log(err); }); in the first example, we have to wait for myfunction() to run and return value before any more of the code can execute.
... now for a real example — what if we wanted to load images dynamically, but we wanted to make sure the images were loaded before we tried to display them?
...And 3 more matches

Writing WebSocket servers - Web APIs
section 10 discusses security and you should definitely peruse it before exposing your server.
...in the handshake, details of the connection are negotiated, and either party can back out before completion if the terms are unfavorable.
... note: regular http status codes can be used only before the handshake.
...And 3 more matches

Rendering and the WebXR frame animation callback - Web APIs
before you can render the virtual environment, you need to establish a webxr session by creating an xrsession using the navigator.xr.requestsession() method; you also need to associate the session with a framebuffer and perform other setup tasks.
...as a result, you wind up with the visual effect of the top part of the screen showing the new frame, while the bottom part of the frame shows some combination of the previous frame and possibly even the frame before that one.
...by simply having your computations and data ready before the frame is actually called for, you can make your site or app render much more efficiently, improving main thread performance and generally making the user experience better.
...And 3 more matches

Starting up and shutting down a WebXR session - Web APIs
before you can begin to render your augmented or virtual reality scenario, you need to create and set up the webxr session, and you should know how to shut it down properly as well.
...it also lets you perform some basic testing before taking your code to a real device.
...again, carefully read the readme file and make sure you're aware of the limitations before you begin.
...And 3 more matches

Implementing a Microsoft Active Accessibility (MSAA) Server - Accessibility
we'll have to wait and see how good the msaa support in longhorn is, before we can call this one.
...it is not "plug and play", and will take a lot of testing/refinement before your solution works with any product.
... solution: create a "shutdown" method for each internal accessible object, to remove any references to other internal objects before any of your dll's are unloaded.
...And 3 more matches

Linear-gradient Generator - CSS: Cascading Style Sheets
0, 0%, 100%) 0%, hsla(0, 0%, 100%, 0) 50%, hsla(0, 0%, 0%, 0) 50%, hsl(0, 0%, 0%) 100%), -o-linear-gradient(left, hsl(0, 0%, 50%) 0%, hsla(0, 0%, 50%, 0) 100%); background-color: #f00; } .ui-color-picker .picker { width: 10px; height: 10px; margin: -5px 0 0 -5px; border-radius: 50%; border: 1px solid #fff; position: absolute; top: 45%; left: 45%; } .ui-color-picker .picker:before { width: 8px; height: 8px; content: ""; position: absolute; border: 1px solid #999; border-radius: 50%; } .ui-color-picker .hue, .ui-color-picker .alpha { width: 198px; height: 28px; margin: 5px; border: 1px solid #fff; float: left; } .ui-color-picker .hue { background: url("images/hue_mask.png"); background: -moz-linear-gradient(left, #f00 0%, #ff0 16.66%, #0f0 33.33%, #0ff 50%, ...
...c="hexa"] > input { width: 90px; height: 24px; padding: 2px 0; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; } /* preview color */ .ui-color-picker .preview { width: 95px; height: 53px; margin: 5px; margin-top: 10px; border: 1px solid #ddd; background-image: url("images/alpha.png"); float: left; position: relative; } .ui-color-picker .preview:before { height: 100%; width: 50%; left: 50%; top: 0; content: ""; background: #fff; position: absolute; z-index: 1; } .ui-color-picker .preview-color { width: 100%; height: 100%; background-color: rgba(255, 0, 0, 0.5); position: absolute; z-index: 1; } .ui-color-picker .switch_mode { width: 10px; height: 20px; position: relative; border-radius: 5px 0 0 5px; border: 1px solid #ddd; ...
...rue'] { opacity: 1; z-index: 1; } .gradient-axis:after { content: ""; width: 25px; height: 100%; background-color: #ccc; position: absolute; left: 0; top: 0; } .gradient-axis .gradient-line { width: 80%; height: 100%; margin: 0px auto; position: relative; } .gradient-axis .gradient-line:hover { cursor: pointer; } .gradient-axis .gradient-line:after, .gradient-axis .gradient-line:before { content: ""; width: 1px; height: 100px; background-color: #ccc; position: absolute; top: -48px; } .gradient-axis .gradient-line:after { left: -1px; } .gradient-axis .gradient-line:before { right: -1px; } .gradient-axis .gradient-point { width: 16px; height: 16px; margin: 0 0 0 -8px; top: -7px; border-radius: 50%; background-color: #fff; border: 1px solid #999; position: absol...
...And 3 more matches

String.prototype.localeCompare() - JavaScript
the localecompare() method returns a number indicating whether a reference string comes before, or after, or is the same as the given string in sort order.
... return value a negative number if referencestr occurs before comparestring; positive if the referencestr occurs after comparestring; 0 if they are equivalent.
... description returns an integer indicating whether the referencestr comes before, after or is equivalent to the comparestring.
...And 3 more matches

Strict mode - JavaScript
strict mode for scripts to invoke strict mode for an entire script, put the exact statement "use strict"; (or 'use strict';) before any other statements.
... strict mode for functions likewise, to invoke strict mode for a function, put the exact statement "use strict"; (or 'use strict';) in the function's body before any other statements.
...ble: false }); obj1.x = 9; // throws a typeerror // assignment to a getter-only property var obj2 = { get x() { return 17; } }; obj2.x = 5; // throws a typeerror // assignment to a new property on a non-extensible object var fixed = {}; object.preventextensions(fixed); fixed.newprop = 'ohai'; // throws a typeerror third, strict mode makes attempts to delete undeletable properties throw (where before the attempt would simply have no effect): 'use strict'; delete object.prototype; // throws a typeerror fourth, strict mode prior to gecko 34 requires that all properties named in an object literal be unique.
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Mapping the width and height attributes of media container elements to their aspect-ratio - Web media technologies
this change means that the aspect ratio of the image is calculated by the browser early on and can then be used to correct the size needed to display the image before it has loaded, if css has been applied that causes problems with its display size.
... a new way of sizing images before loading completes recognizing the problem, a wicg community group formed to propose an intrinsicsize attribute.
... due to this work, browsers are working on adding a new mechanism for sizing images before the actual image is loaded.
...And 3 more matches

Navigation and resource timings - Web Performance
this moment is before the check to any application cache.
... domcontentloadedeventstart right before the parser sent the domcontentloaded event, that is right after all the scripts that need to be executed right after parsing have been executed.
... navigation timing when a user requests a web site or application, to populate the browser the user agent goes through a series of steps, including a dns lookup, tcp handshake, and ssl negotiation, before the user agent makes the actual request and the servers return the requested assets.
...And 3 more matches

Understanding WebAssembly text format - WebAssembly
there is another issue here — using numeric indices to refer to items can be confusing and annoying, so the text format allows you to name parameters, locals, and most other items simply by including a name prefixed by a dollar symbol ($) just before the type declaration.
... (note that when this text gets converted to binary, though, the binary will contain only the integer.) stack machines before we can write a function body, we have to talk about one more thing: stack machines.
... our first function body as mentioned before, the function body is simply a list of instructions that are followed as the function is called.
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Using the WebAssembly JavaScript API - WebAssembly
these methods don't directly access the byte code, so require an extra step to turn the response into an arraybuffer before compiling/instantiating the wasm module.
... make a local copy of memory.wasm in the same directory as before.
... go back to your memory.html sample file, and fetch, compile, and instantiate your wasm module as before — add the following to the bottom of your script: webassembly.instantiatestreaming(fetch('memory.wasm'), { js: { mem: memory } }) .then(results => { // add code here }); since this module exports its memory, given an instance of this module called instance we can use an exported function accumulate() to create and populate an input array directly in the module instance’s linear memory (mem).
...And 3 more matches

The Essentials of an Extension - Archive of obsolete content
<em:name>xul school hello world</em:name> <em:description>welcome to xul school!</em:description> <em:version>0.1</em:version> <em:creator>appcoast</em:creator> <em:homepageurl>https://developer.mozilla.org/docs/xul_school</em:homepageurl> this is the data that is displayed before and after the extension is installed, that you can see in the add-ons manager.
...the file you opened before, downloads.xul, has the code that defines the downloads window.
... one recommended location for menus in the classic menu vase is under the tools menu, so the code should really look like this: <menupopup id="menu_toolspopup"> <menu id="xulschoolhello-hello-menu" label="&xulschoolhello.hello.label;" accesskey="&xulschoolhello.hellomenu.accesskey;" insertbefore="devtoolsendseparator"> <menupopup> <menuitem id="xulschoolhello-hello-menu-item" label="&xulschoolhello.hello.label;" accesskey="&xulschoolhello.helloitem.accesskey;" oncommand="xulschoolchrome.browseroverlay.sayhello(event);" /> </menupopup> </menu> </menupopup> we're overlaying the menu that is deeper into the xul tree, but it doesn't matter because ...
...And 2 more matches

Making it into a static overlay - Archive of obsolete content
because our extension modifies an existing file in the mozilla distribution, before we package it up we need to separate the modifications into a different file and add them back in at run time via a dynamic xul overlay.
...e://navigator/content/tinderstatus.css" type="text/css"?> <overlay id="tinderstatusoverlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script type="application/javascript" src="chrome://navigator/content/tinderstatus.js" /> <statusbar id="status-bar"> <statusbarpanel class="statusbarpanel-iconic" id="tinderbox-status" insertbefore="offline-status" status="none"/> </statusbar> </overlay> tinderstatusoverlay.xul starts with an xml processing instruction that identifies the file as xml (all xul files need to include this).
...note that we've added a new attribute to the statusbarpanel element: insertbefore.
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Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
browsers, like internet explorer 4, that were built before the conception of w3c standards inherited many quirks.
... before i go into the differences between mozilla and internet explorer, i'll cover some basic ways you can make a web application extensible in order to add new browser support later.
... insertbefore( anewnode, achildnode ) inserts anewnode before achildnode, which must be a child of the current node.
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Extensions - Archive of obsolete content
for instance: <menubar id="main-menubar"> <menu label="search" insertbefore="tools-menu"> <menupopup> <menuitem label="web"/> <menuitem label="mail"/> </menupopup> </menu> </menubar> this menu is added to the main menu bar just before the tools menu.
... the insertbefore attribute is set to 'tools-menu' to ensure that the new menu is added at the right place.
...because of this, the new item might not appear at the end of the menu but before a menuitem added by another extension, depending on the order in which the overlays are applied.
...And 2 more matches

panel - Archive of obsolete content
norestorefocus type: boolean if false, the default value, then when the panel is hidden, the keyboard focus will be restored to whatever had the focus before the panel was opened.
... onpopupshowing type: script code this event is sent to a popup just before it is opened.
... valid single-word values are after_start, after_end, before_start, before_end, end_after, end_before, start_after, start_before, overlap, at_pointer or after_pointer.
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toolbar - Archive of obsolete content
methods insertitem( id, beforenode, wrapper, beforepermanent ) not in seamonkey 1.x return type: element add an item with the given id to the toolbar.
... the new item is added just before the item given by the second argument.
... if the second argument is null, but the beforepermanent argument is true, the item is added to the beginning of the toolbar before the first permanent item.
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Using IO Timeout And Interrupt On NT - Archive of obsolete content
due to a limitation of the present implementation of nspr io on nt, programs must follow the following guideline: if a thread calls an nspr io function on a file descriptor and the io function fails with <tt>pr_io_timeout_error</tt> or <tt>pr_pending_interrupt_error</tt>, the file descriptor must be closed before the thread exits.
...if the io operation cannot complete before the specified timeout, the io function returns with <tt>pr_io_timeout_error</tt>.
... io timeout and interrupt however, nspr may wake up the thread in two other situations: if the overlapped io request is not completed before the specified timeout.
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XForms Input Element - Archive of obsolete content
mozilla extensions labelposition - only for boolean types: show the label before or after the checkbox (see below) type restrictions the input element can be bound to a node containing simple content of any data type except xsd:base64binary, xsd:hexbinray or any data type derived from these.
...characteristics used when the instance node is of type xsd:boolean or a type derived from it analogous widgets are <xhtml:input type="checkbox"/> and <xul:checkbox/> the corresponding label can be displayed before or after the checkbox by using the labelposition attribute.
...this attribute is optional, possible values are before and after.
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Anatomy of a video game - Game development
that callback function will be executed at a suitable time before the next repaint.
... here is an example of a simple main loop: window.main = function () { window.requestanimationframe( main ); // whatever your main loop needs to do }; main(); // start the cycle note: in each of the main() methods discussed here, we schedule a new requestanimationframe before performing our loop contents.
...before we discuss ways to change it, let us discuss what it already does well.
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Cascade and inheritance - Learn web development
we encourage you to work through this section carefully, and check that you understand the concepts before moving on.
...it's a convenient way to undo changes made to styles so that you can get back to a known starting point before beginning new changes.
...ctor thousands hundreds tens ones total specificity h1 0 0 0 1 0001 h1 + p::first-letter 0 0 0 3 0003 li > a[href*="en-us"] > .inline-warning 0 0 2 2 0022 #identifier 0 1 0 0 0100 no selector, with a rule inside an element's style attribute 1 0 0 0 1000 before we move on, let's look at an example in action.
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Advanced form styling - Learn web development
fferent browsers handle this in many different, often ugly ways: browser rendering firefox 71 (macos) firefox 57 (windows 10) chrome 77 (macos), safari 13, opera chrome 63 (windows 10) internet explorer 11 (windows 10) edge 16 (windows 10) using appearence: none on radios/checkboxes as we showed before, you can remove the default appearance of a checkbox or radio button altogether with appearance:none; let's take this example html: <form> <fieldset> <legend>fruit preferences</legend> <p> <label> <input type="checkbox" name="fruit-1" value="cherry"> i like cherry </label> </p> <p> <label> <input type="checkbox" name="fruit-2" value="b...
... :disabled pseudo-classes to change the appearance of our custom checkbox as its state changes: input[type="checkbox"] { position: relative; width: 1em; height: 1em; border: 1px solid gray; /* adjusts the position of the checkboxes on the text baseline */ vertical-align: -2px; /* set here so that windows' high-contrast mode can override */ color: green; } input[type="checkbox"]::before { content: "✔"; position: absolute; font-size: 1.2em; right: -1px; top: -0.3em; visibility: hidden; } input[type="checkbox"]:checked::before { /* use `visibility` instead of `display` to avoid recalculating layout */ visibility: visible; } input[type="checkbox"]:disabled { border-color: black; background: #ddd; color: gray; } you'll find more out about such pseudo-class...
...we put an extra wrapper around the control, because ::before/::after don't work on <select> elements (this is because generated content is placed relative to an element's formatting box, but form inputs work more like replaced elements — their display is generated by the browser and put in place — and therefore don't have one): <div class="select-wrapper"><select id="select" name="select"> <option>banana</option> <option>cherry</option> <option>...
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Tips for authoring fast-loading HTML pages - Learn web development
too much time spent querying the last modified time of the referenced files can delay the initial display of the web page, since the browser must check the modification time for each of these files, before rendering the page.
... any dynamic features that require the page to complete loading before being used, should be initially disabled, and then only enabled after the page has loaded.
...consider compressing your images before adding them to your page, using compression features built into image-manipulation tools such as photoshop, or using a specialized tool such as compress jpeg or tiny png,.
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Choosing the right approach - Learn web development
single delayed operation repeating operation multiple sequential operations multiple simultaneous operations yes yes (recursive timeouts) yes (nested timeouts) no code example here the browser will wait two seconds before executing the anonymous function, then will display the alert message (see it running live, and see the source code): let mygreeting = settimeout(function() { alert('hello, mr.
...ion to setinterval(), using code like this: let i = 1; settimeout(function run() { console.log(i); i++; settimeout(run, 100); }, 100); there is a difference between recursive settimeout() and setinterval(): recursive settimeout() guarantees at least the specified amount of time (100ms in this example) will elapse between the executions; the code will run and then wait 100 milliseconds before it runs again.
... further information cooperative asynchronous javascript: timeouts and intervals, in particular requestanimationframe() requestanimationframe() reference promises promises are a javascript feature that allows you to run asynchronous operations and wait until it is definitely complete before running another operation based on its result.
...And 2 more matches

Arrays - Learn web development
for example: let sequence = [1, 1, 2, 3, 5, 8, 13]; let random = ['tree', 795, [0, 1, 2]]; before proceeding, create a few example arrays.
...try this: shopping[0] = 'tahini'; shopping; // shopping will now return [ "tahini", "milk", "cheese", "hummus", "noodles" ] note: we've said it before, but just as a reminder — computers start counting from 0!
...for example, to access one of the items inside the array that is the third item inside the random array (see previous section), we could do something like this: random[2][2]; try making some more modifications to your array examples before moving on.
...And 2 more matches

Adding features to our bouncing balls demo - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... hints and tips a couple of pointers before you get started.
...read the whole assessment before you start coding, and take each step slowly and carefully.
...And 2 more matches

Accessibility in React - Learn web development
when we switch between templates in our <todo /> component, we completely remove the elements that were there before to replace them with something else.
...however, you may have noticed a new problem — the "edit" button in the final <todo /> component is focussed immediately on page load, before we even interact with the app!
...using pseudocode, our logic should be something like this: if (wasnoteditingbefore && iseditingnow) { focusoneditfield() } if (waseditingbefore && isnoteditingnow) { focusoneditbutton() } the react team had discussed ways to get a component’s previous state, and has provided an example custom hook we can use for the job.
...And 2 more matches

React interactivity: Events and state - Learn web development
handling events if you've only written vanilla javascript before now, you might be used to having a separate javascript file, where you query for some dom nodes and attach listeners to them.
... const [name, setname] = usestate(''); reading user input before we can change the value of name, we need to capture a user's input as they type.
... add this inside your app() definition, before the return statement: const headingtext = `${tasklist.length} tasks remaining`; hrm.
...And 2 more matches

Styling Vue components with CSS - Learn web development
styling vue components with css before we move on to add more advanced features to our app, we should add some basic css to make it look better.
... add the following contents to the reset.css file: /*reset.css*/ /* resets */ *, *::before, *::after { box-sizing: border-box; } *:focus { outline: 3px dashed #228bec; } html { font: 62.5% / 1.15 sans-serif; } h1, h2 { margin-bottom: 0; } ul { list-style: none; padding: 0; } button { border: none; margin: 0; padding: 0; width: auto; overflow: visible; background: transparent; color: inherit; font: inherit; line-height: normal; -webkit-font-smoothing: inh...
...the images below show the look of the app before and after the reset is applied.
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Creating Sandboxed HTTP Connections
for cookies, the two topics are: http-on-modify-request - happens after the cookie data has been loaded into the request, but before the request is sent.
... http-on-examine-response - happens after the response is received, but before the cookies are processed whether to hold a weak reference to the observer argument.
... these methods provide all the required functionality needed to modify cookies before they are processed/sent, allowing for sandboxed cookie connections that don't affect the user's cookies.
...And 2 more matches

The Firefox codebase: CSS Guidelines
before adding more css it is good practice to check if the css that is being written is needed, it can be the case that a common component has been already written could be reused with or without changes.
... formatting spacing & indentation 2 spaces indentation is preferred add a space after each comma, except within color functions: linear-gradient(to bottom, black 1px, rgba(255,255,255,0.2) 1px) always add a space before !important.
... using descendant selectors is good practice for performance when possible: for example: .autocomplete-item[selected] > .autocomplete-item-title would be more efficient than .autocomplete-item[selected] .autocomplete-item-title overriding css before overriding any css rules, check whether overriding is really needed.
...And 2 more matches

Localizing with Koala
before you can use them, you need to create a new koala project.
... note how koala is smart enough to insert this entity before searchendcap.label.
...to make sure you're always translating the most recent en-us reference, you should update the source repository before you start working.
...And 2 more matches

Mozilla DOM Hacking Guide
before we begin the explanation of class info, i'd like to introduce quickly the javascript engine and xpconnect.
...if this method has been called before.
...specifically, due to some changes that happened around, april 2002, some things that were not possible before are now possible.
...And 2 more matches

Mozilla Development Strategies
it's your responsibility to find and fix the problems in your code before checking in.
...appreciate it even more if they find it before you ship.
... they're giving you a second chance to get it right before it becomes a bug that affects users.
...And 2 more matches

sslintro.html
must be called before any other nss functions.
...one of these functions must be called before any cryptographic operations can be performed with nss.
...for an ssl socket that is configured before it is connected, ssl figures this out when the application calls pr_connect or pr_accept.
...And 2 more matches

How to embed the JavaScript engine
s_enumeratestub, js_resolvestub, js_convertstub, }; int main(int argc, const char *argv[]) { jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext.
... nullptr, js_globalobjecttracehook }; int main(int argc, const char *argv[]) { js_init(); jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext.
...nullptr, nullptr, nullptr, js_globalobjecttracehook }; int main(int argc, const char *argv[]) { js_init(); jsruntime *rt = js_newruntime(8l * 1024 * 1024); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext.
...And 2 more matches

JSAPI User Guide
report->filename : "[no filename]", (unsigned int) report->lineno, message); } int run(jscontext *cx) { // enter a request before running anything in the context.
...each of these functions checks, just before it returns, to see if an exception is pending in the current jscontext.
...*/ char *filename; unsigned int lineno; /* * the return value comes back here -- if it could be a gc thing, you must * add it to the gc's "root set" with js_add*root(cx, &thing) where thing * is a jsstring *, jsobject *, or jsdouble *, and remove the root before * rval goes out of scope, or when rval is no longer needed.
...And 2 more matches

SpiderMonkey 31
migrating to spidermonkey 31 the first change most embedders will notice is that spidermonkey must now be initialized before it can be used, using the newly-repurposed js_init method.
... js_init is a new function which must be used to initialize the js engine before any jsruntimes are created or other jsapi methods are called.
... it must be called before js_init is called.
...And 2 more matches

Redis Tips
getting started with redis before you go any further in this document, make sure you have played with redis for at least 5 or 10 minutes.
... it sets the value of a key, and returns the value the key had before you changed it.
... and you'll probably find problems like that long before you go into production.
...And 2 more matches

Avoiding leaks in JavaScript XPCOM components
to understand closures a little better before examining how they can cause leaks, consider the following example, in which there are two pairs of function objects, and each pair has an instance of the private_data variable: // this function returns an array containing two functions.
...(var declarations inside javascript functions are function-scope, including the part of the function before the declaration.) this means that the value of iterator, the wrapper for the native tree walker, is reachable from the function.
... simply assigning iterator = null before the return is sufficient to fix the leak.
...And 2 more matches

nsIMessenger
savefirst if true, the attachment is saved using saveattachment() before it is deleted.
... withoutwarning if true, no warning is shown to the user before the delete.
... savefirst if true, the attachments are saved using saveallattachments() before being deleted.
...And 2 more matches

nsIXULTemplateQueryProcessor
the template builder must call initializeforbuilding() before the other methods, except for translateref().
...the template builder will call this method once for each query within the template, before any results can be generated using generateresults(), but after initializeforbuilding() has been called.
...this will be called before the rules are processed and whenever the template is rebuilt.
...And 2 more matches

Thunderbird Configuration Files
locate your profile folder before the configuration files are presented, you should know how to find your profile folder, which is where thunderbird saves all your settings on your hard drive.
...this folder does not exist by default, so you need to create it before you can start adding your preferences.
...as with userchrome.css, this folder does not exist by default, so you need to create it before you can start adding your preferences.
...And 2 more matches

Basic operations - Firefox Developer Tools
opening the memory tool before firefox 50, the memory tool is not enabled by default.
... to load a snapshot from an existing .fxsnapshot file, click the import button, which looks like a rectangle with an arrow rising from it (before firefox 49, this button was labeled with the text "import..."): you'll be prompted to find a snapshot file on disk.
... to create a diff, click the button that looks like a venn diagram next to the camera icon (before firefox 47, this looked like a "+/-" icon): you'll be prompted to select the snapshot to use as a baseline, then the snapshot to compare.
...And 2 more matches

HTMLTableElement - Web APIs
if a correct object is given, it is inserted in the tree immediately before the first element that is neither a <caption>, nor a <colgroup>, or as the last child if there is no such element, and the first <thead> that is a child of this element is removed from the tree, if any.
...if a correct object is given, it is inserted in the tree immediately before the first element that is neither a <caption>, a <colgroup>, nor a <thead>, or as the last child if there is no such element, and the first <tfoot> that is a child of this element is removed from the tree, if any.
...if none is found, a new one is created and inserted in the tree immediately before the first element that is neither a <caption>, nor a <colgroup>, or as the last child if there is no such element.
...And 2 more matches

Establishing a connection: The WebRTC perfect negotiation pattern - Web APIs
process of sending an offer, and making use of the updated setlocaldescription() method: let makingoffer = false; pc.onnegotiationneeded = async () => { try { makingoffer = true; await pc.setlocaldescription(); signaler.send({ description: pc.localdescription }); } catch(err) { console.error(err); } finally { makingoffer = false; } }; we set makingoffer immediately before calling setlocaldescription() in order to lock against interfering with sending this offer, and we don't clear it back to false until the offer has been sent to the signaling server (or an error has occurred, preventing the offer from being made).
...and these must both be completed before we can proceed with handling the received offer.
... since there isn't a single "roll back and use this offer instead", performing this change on the polite peer requires two steps, executed in the context of promise.all(), which is used to ensure that both statements execute completely before continuing to handle the received offer.
...And 2 more matches

Using XMLHttpRequest - Web APIs
regexp can be used if you always know the content of the xml document beforehand.
... regexp can be used if you always know the content of the html responsetext beforehand.
... note: you need to add the event listeners before calling open() on the request.
...And 2 more matches

Color picker tool - CSS: Cascading Style Sheets
inear-gradient(top, hsl(0, 0%, 100%) 0%, hsla(0, 0%, 100%, 0) 50%, hsla(0, 0%, 0%, 0) 50%, hsl(0, 0%, 0%) 100%), -o-linear-gradient(left, hsl(0, 0%, 50%) 0%, hsla(0, 0%, 50%, 0) 100%); background-color: #f00; } .ui-color-picker .picker { width: 10px; height: 10px; border-radius: 50%; border: 1px solid #fff; position: absolute; top: 45%; left: 45%; } .ui-color-picker .picker:before { width: 8px; height: 8px; content: ""; position: absolute; border: 1px solid #999; border-radius: 50%; } .ui-color-picker .hue, .ui-color-picker .alpha { width: 198px; height: 28px; margin: 5px; border: 1px solid #fff; float: left; } .ui-color-picker .hue { background: url("https://mdn.mozillademos.org/files/5701/hue.png") center; background: -moz-linear-gradient(left, #f00 0%, #f...
... height: 24px; padding: 2px 0; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; } /* preview color */ .ui-color-picker .preview { width: 95px; height: 53px; margin: 5px; margin-top: 10px; border: 1px solid #ddd; background-image: url("https://mdn.mozillademos.org/files/5705/alpha.png"); float: left; position: relative; } .ui-color-picker .preview:before { height: 100%; width: 50%; left: 50%; top: 0; content: ""; background: #fff; position: absolute; z-index: 1; } .ui-color-picker .preview-color { width: 100%; height: 100%; background-color: rgba(255, 0, 0, 0.5); position: absolute; z-index: 1; } .ui-color-picker .switch_mode { width: 10px; height: 20px; position: relative; border-radius: 5px 0 0 5px; border: 1px solid #ddd; ...
...: url('https://mdn.mozillademos.org/files/6065/arrow.png') center no-repeat; width: 100%; height: 12px; top: -12px; z-index: 2; } #picker-samples #add-icon { width: 100%; height: 100%; position: relative; box-shadow: inset 0px 0px 2px 0px #ddd; } #picker-samples #add-icon:hover { cursor: pointer; border-color: #ddd; box-shadow: inset 0px 0px 5px 0px #ccc; } #picker-samples #add-icon:before, #picker-samples #add-icon:after { content: ""; position: absolute; background-color: #eee; box-shadow: 0 0 1px 0 #eee; } #picker-samples #add-icon:before { width: 70%; height: 16%; top: 42%; left: 15%; } #picker-samples #add-icon:after { width: 16%; height: 70%; top: 15%; left: 42%; } #picker-samples #add-icon:hover:before, #picker-samples #add-icon:hover:after { background-color...
...And 2 more matches

Controlling Ratios of Flex Items Along the Main Axis - CSS: Cascading Style Sheets
flex-basis: what is the size of the item before growing and shrinking happens?
... important concepts when working on the main axis there are a few concepts worth digging into before looking at how the flex properties work to control ratios along the main axis.
... these relate to the natural size of flex items before any growing or shrinking takes place, and to the concept of free space.
...And 2 more matches

WebKit CSS extensions - CSS: Cascading Style Sheets
a -webkit-animation-trigger -webkit-app-region -webkit-appearance* -webkit-aspect-ratio b -webkit-backdrop-filter -webkit-background-composite -webkit-border-after** -webkit-border-after-color** -webkit-border-after-style** -webkit-border-after-width** -webkit-border-before** -webkit-border-before-color** -webkit-border-before-style** -webkit-border-before-width** -webkit-border-end** -webkit-border-end-color** -webkit-border-end-style** -webkit-border-end-width** -webkit-border-fit -webkit-border-horizontal-spacing -webkit-border-start** -webkit-border-start-color** -webkit-border-start-style** -webkit-border-start-width** -webkit-border-vertical-spac...
...ing -webkit-box-align** -webkit-box-direction** -webkit-box-flex-group** -webkit-box-flex** -webkit-box-lines** -webkit-box-ordinal-group** -webkit-box-orient** -webkit-box-pack** -webkit-box-reflect** c -webkit-column-axis -webkit-column-break-after -webkit-column-break-before -webkit-column-break-inside -webkit-column-progression -webkit-cursor-visibility d-i -webkit-dashboard-region -webkit-font-size-delta -webkit-font-smoothing -webkit-highlight -webkit-hyphenate-character -webkit-hyphenate-limit-after -webkit-hyphenate-limit-before -webkit-hyphenate-limit-lines -webkit-initial-letter l -webkit-line-align -webkit-line-box-contain -webkit-line-clamp -webkit-line-grid -webkit-line-snap -webkit-locale -webkit-logical-height -webkit-logical-width m ...
... -webkit-margin-after-collapse -webkit-margin-after -webkit-margin-before-collapse -webkit-margin-before -webkit-margin-bottom-collapse -webkit-margin-collapse -webkit-margin-end** -webkit-margin-start** -webkit-margin-top-collapse -webkit-marquee-direction -webkit-marquee-increment -webkit-marquee-repetition -webkit-marquee-speed -webkit-marquee-style -webkit-marquee -webkit-mask-box-image-outset -webkit-mask-box-image-repeat -webkit-mask-box-image-slice -webkit-mask-box-image-source -webkit-mask-box-image-width -webkit-mask-box-image -webkit-mask-repeat-x -webkit-mask-repeat-y -webkit-mask-source-type -webkit-max-logical-height -webkit-max-logical-width -webkit-min-logical-height -webkit-min-logical-width n -webkit-nbsp-mode p -webkit-padding-after** -web...
...And 2 more matches

Cross-browser audio basics - Developer guides
so the ideal place to create a fallback or inform of incompatibility is before the closing </audio> tag.
... preload the preload attribute allows you to specify a preference for how the browser preloads the audio, in other words, which part of the file it downloads when the <audio> element is initialized, and before the play button is pressed.
... preload can take 3 different values: none: don't download anything before the play button is pressed.
...And 2 more matches

Printing - Developer guides
you want to adjust the user experience of printing, such as presenting a specially-formatted version of your content before printing begins.
... <link href="/path/to/print.css" media="print" rel="stylesheet" /> using media queries to improve layout detecting print requests some browsers (including firefox 6 and later and internet explorer) send beforeprint and afterprint events to let content determine when printing may have occurred.
... note: you can also use window.onbeforeprint and window.onafterprint to assign handlers for these events, but using eventtarget.addeventlistener() is preferred.
...And 2 more matches

Control flow and error handling - JavaScript
important: javascript before ecmascript2015 (6th edition) does not have block scope!
...for example: var x = 1; { var x = 2; } console.log(x); // outputs 2 this outputs 2 because the var x statement within the block is in the same scope as the var x statement before the block.
...the finally block executes after the try and catch blocks execute but before the statements following the try...catch statement.
...And 2 more matches

Using Promises - JavaScript
since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them.
... guarantees unlike old-fashioned passed-in callbacks, a promise comes with some guarantees: callbacks will never be called before the completion of the current run of the javascript event loop.
...read the following example: new promise((resolve, reject) => { console.log('initial'); resolve(); }) .then(() => { throw new error('something failed'); console.log('do this'); }) .catch(() => { console.error('do that'); }) .then(() => { console.log('do this, no matter what happened before'); }); this will output the following text: initial do that do this, no matter what happened before note: the text do this is not displayed because the something failed error caused a rejection.
...And 2 more matches

var - JavaScript
description var declarations, wherever they occur, are processed before any code is executed.
... 'use strict'; function foo() { var x = 1; function bar() { var y = 2; console.log(x); // 1 (function `bar` closes over `x`) console.log(y); // 2 (`y` is in scope) } bar(); console.log(x); // 1 (`x` is in scope) console.log(y); // referenceerror in strict mode, `y` is scoped to `bar` } foo(); variables declared using var are created before any code is executed in a process known as hoisting.
... var hoisting because variable declarations (and declarations in general) are processed before any code is executed, declaring a variable anywhere in the code is equivalent to declaring it at the top.
...And 2 more matches

Web video codec guide - Web media technologies
aliasing aliasing is a general term for anything that upon being reconstructed from the encoded data does not look the same as it did before compression.
...these are due to the mathematics involved in the coding of the residual frames, and can be easily noticed before being repaired by the next key frame.
... the absolute minimum frame rate that a video can be before its contents are no longer perceived as motion by the human eye is about 12 frames per second.
...And 2 more matches

Populating the page: how browsers work - Web Performance
this mechanism is designed so that two entities attempting to communicate—in this case the browser and web server—can negotiate the parameters of the network tcp socket connection before transmitting data, often over https.
...this handshake, or rather the tls negotiation, determines which cipher will be used to encrypt the communication, verifies the server, and establishes that a secure connection is in place before beginning the actual transfer of data.
... this requires three more round trips to the server before the request for content is actually sent.
...And 2 more matches

Communicating With Other Scripts - Archive of obsolete content
page scripts if a page includes its own scripts using <script> tags, either embedded in the page or linked to it using the src attribute, there are a couple of ways a content script can communicate with it: using the dom postmessage() api using custom dom events using the dom postmessage api note that before firefox 31 code in content scripts can't use window to access postmessage() and addeventlistener() and instead must use document.defaultview.
... see the section below on using postmessage() before firefox 31.
... } </script> <button onclick="sendmessage()">send message</button> </body> </html> finally, the content script "listen.js" uses window.addeventlistener() to listen for messages from the page script: // listen.js window.addeventlistener('message', function(event) { console.log(event.data); // message from page script console.log(event.origin); }, false); using postmessage() before firefox 31 if your add-on is running in a version of firefox before firefox 31, then your content script can't access the postmessage() or addeventlistener() apis using window, but must access them using document.defaultview instead.
... before firefox 30 here's an example showing how to use custom dom events to send a message from a content script to a page script, before firefox 30.

Interacting with page scripts - Archive of obsolete content
communicating with page scripts there are two different ways a content script can communicate with a page script: using the dom postmessage() api using custom dom events using the dom postmessage api note that before firefox 31 code in content scripts can't use window to access postmessage() and addeventlistener() and instead must use document.defaultview.
... see the section below on using postmessage() before firefox 31.
...); } </script> <button onclick="sendmessage()">send message</button> </body> </html> finally, the content script "listen.js" uses window.addeventlistener() to listen for messages from the page script: // listen.js window.addeventlistener('message', function(event) { console.log(event.data); // message from page script console.log(event.origin); }, false); postmessage() before firefox 31 if your add-on is running in a version of firefox before firefox 31, then your content script can't access the postmessage() or addeventlistener() apis using window, but must access them using document.defaultview instead.
... before firefox 30 here's an example showing how to use custom dom events to send a message from a content script to a page script, before firefox 30.

widget - Archive of obsolete content
content scripts specified by this property are loaded before those specified by the contentscript property.
...this may take one of the following values: "start": load content scripts immediately after the document element for the widget is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the widget has been loaded, at the time the window.onload event fires this property is optional and defaults to "end".
...this may have one of the following values: "start": load content scripts immediately after the document element for the widget is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the widget has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.
...this may have one of the following values: "start": load content scripts immediately after the document element for the widget view is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the widget view has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.

Forms related code snippets - Archive of obsolete content
date picker (before implementing it in a working environment, please read the note about the const statement compatibility) <!doctype html> <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <title>datepicker example - mdn</title> <script type="text/javascript"> /*\ |*| |*| datepicker example mdndeveloper network |*| |*| https://developer.mozilla.org/docs/code_snippets/forms |*| https://developer.mozilla.org/user:fusionchess |*| |*| this snippet is released under the gnu public license, version 3 or later.
... this.writedays(); otarget.onclick = function () { if (otable.parentnode) { otable.parentnode.removechild(otable); return; } otable.style.zindex = nzindex++; otable.style.position = "absolute"; otable.style.left = otarget.offsetleft + "px"; otable.style.top = (otarget.offsettop + otarget.offsetheight) + "px"; otarget.parentnode.insertbefore(otable, otarget); }; ainstances.push(this); } datepicker.prototype.writedays = function () { const nendblanks = (this.current.getday() + bzeroismonday * 6) % 7, nend = amonthlengths[this.current.getmonth()] + nendblanks, ntotal = nend + ((7 - nend % 7) % 7); var otd, otr; if (this.otbody) { this.container.removechild(this.otbody); } thi...
... image preview before upload the filereader.prototype.readasdataurl() method can be useful, for example, to get a preview of an image before uploading it.[article] this example shows how to use it in this way.
... note: the filereader() constructor was not supported by internet explorer for versions before 10.

Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
before you learn how to develop extensions, let's learn about xul, the xml-based user-interface language, which is one of the building blocks for extensions.
... common attributes before we look at the various interface objects, let's look at some of their common attributes, especially the frequently used ones.
... <?xml version="1.0" encoding="utf-8"?> <overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <hbox id="box1" align="center" style="border: 1px solid; margin: 1em;"> <button label="button 1"/> <button label="button 2" insertbefore="label1"/> </hbox> <button label="button 3"/> </overlay> listing 25: substitute code for overlaydocument.xul let's open base.xul in a firefox window again.
... figure 20: output from listing 23 and 25 furthermore, following the declaration insertbefore="label1", the "button2" button now has been inserted before the element with the id "label1".

Appendix F: Monitoring DOM changes - Archive of obsolete content
often times, this must be used in combination with a slight delay, or even polling, via settimeout, for cases where the url change happens before the page is fully loaded.
...in particular, the ::before and ::after pseudo-elements, and pseudo-classes like :hover and :active can be used to achieve extremely complex dynamic behavior.
...variations on this method include modifying the arguments passed to the wrapped function, modifying its return value, and making changes both before and after the original method is called.
...for instance, if you need to know about attribute changes to a particular node, then you should replace its setattribute method with a function that calls the original setattribute function as originalsetattribute.apply(this, arguments) before running your necessary event code.

Session store API - Archive of obsolete content
this event is sent just before a tab is restored.
... firefox 3 note in firefox 3 and later, if you need to detect when a tab is about to be closed so that you can update data associated with the tab before it is closed, you can watch for the "sstabclosing" event, which is sent to the tab.
... if you want to set permissions or otherwise manipulate a restored tab before the page is loaded into it, you should watch sstabrestoring.
... starting in firefox 3.5, notifications are sent after reading session store data and before using it, as well as immediately before writing it back to disk.

MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
var ldaphost = "example.com"; var ldapbase = "dc=company,dc=local"; if( userinfo.envuser ) { var ldapfilter = "samaccountname=" + userinfo.envuser; } else { throw("couldn't get uid from the environment"); } // ldap attributes to retrieve from the server var ldapattrs = new array( "cn", "mail", "samaccountname" ); // add more attributes here, if needed) // define how to process ldap results before we make the call function processldapvalues(queryresults) { if( queryresults ) { // build the userinfo object for later use for( var attr in ldapattrs ) { userinfo[ ldapattrs[attr] ] = getldapvalue( queryresults, ldapattrs[attr] ); } } else { throw( "no ldap results" ); } } // call upon ldap for the values in ldapattrs array, // uses the previous processldapvalues() ge...
...getldapattributes("ldap2.int-evry.fr", "ou=people,dc=int-evry,dc=fr", "uid=" +env_user, "uid,cn,mail"); } catch(e) { displayerror("lockedpref", e); } eop print $page; windows peculiarities without web base cgi file, beware that in windows, the original (before encoding) mozilla.js file must start with: //begin ce prefs , if not you'll get "failed to read configuration file..." message, and mozilla won't start :-( in windows environment variables like user or home, are username and homepath, that's why we must create a different pair of configuration files (cfg and cgi) for both systems (linux/windows).
... the shuffle function comes from here: http://www.mickweb.com/javascript/ar...reshuffle.html before publishing the code changes, please add this right before the shuffle function: /** * setup the shuffle method for an array, from mickweb script * factory at: * http://www.mickweb.com/javascript/arrays/pureshuffle.html */ here's how the ldap fail-over works: // 2) setup multiple ldap servers for fail-over var ldap_values; var ldap_servers = new array('ldap2.int-evry.fr', ...
...beware that in windows, that file is already there, so it must be saved before being replaced by ours, in order to come back to a normal state in case of problem.

Developing New Mozilla Features - Archive of obsolete content
learn the codebase and coding practices before you start your feature include learning time in your schedule.
...our cross-platform component model (“xpcom”) is similar to com, but you’ll want to make sure you use it well before going too far with your project.
... if it is not possible to submit your feature in manageable size patches and you submit a 500k patch, be prepared for several months of review and revision before the patch is ready to be checked in it may not take this long.
...we’ve opted to spend the time improving code consistency before check-in when the pain is limited to the developers and the reviewers rather than everyone in the tree.

Creating XPI Installer Modules - Archive of obsolete content
where before a single manifest.rdf file described the resources in an entire package directory or archive, now contents.rdf files can be used for as large or as small a part of your package description as you want; you can use several contents.rdf files in your package to describe the various parts (e.g., one for the skin of your package, another for the content, and so on), or you can use a single one, as wa...
...s common before.
...since we are not updating the mozilla ui to provide special access to this window (e.g., an item in the tasks menu or elsewhere), the measure of the success of the installation of the barley package is that the user can, as before, invoke our software by using a special startup option: mozilla -chrome chrome://barley/content this option tells mozilla to load a chrome other than the default, which is the main browser window.
...while you are developing these resources and before you have made them a package of their own, you can test the basic layout and functionality by opening barley.xul from within mozilla by using file -> open.

Attribute (XUL) - Archive of obsolete content
« xul reference home acceltext accessible accesskey activetitlebarcolor afterselected align allowevents allownegativeassertions alternatingbackground alwaysopenpopup attribute autocheck autocompleteenabled autocompletepopup autocompletesearch autocompletesearchparam autofill autofillaftermatch autoscroll beforeselected buttonaccesskeyaccept buttonaccesskeycancel buttonaccesskeydisclosure buttonaccesskeyextra1 buttonaccesskeyextra2 buttonaccesskeyhelp buttonalign buttondir buttondisabledaccept buttonlabelaccept buttonlabelcancel buttonlabeldisclosure buttonlabelextra1 buttonlabelextra2 buttonlabelhelp buttonorient buttonpack buttons checked checkstate clicktoscroll class closebutton closemenu coalesceduplicatearcs collapse collapsed colo...
...xed flags flex focused forcecomplete grippyhidden grippytooltiptext group handlectrltab height helpuri hidden hidechrome hidecolumnpicker hideheader hideseconds hidespinbuttons highlightnonmatches homepage href icon id ignoreblurwhilesearching ignorecase ignoreincolumnpicker ignorekeys image inactivetitlebarcolor increment index inputtooltiptext insertafter insertbefore instantapply inverted iscontainer isempty key keycode keytext label lastpage lastselected last-tab left linkedpanel max maxheight maxlength maxpos maxrows maxwidth member menu menuactive min minheight minresultsforpopup minwidth mode modifiers mousethrough movetoclick multiline multiple name negate newlines next noautofocus noautohide noinitialfocus nomatc...
...h norestorefocus object observes onbeforeaccept onbookmarkgroup onchange onclick onclosetab oncommand oncommandupdate ondialogaccept ondialogcancel ondialogclosure ondialogextra1 ondialogextra2 ondialoghelp onerror onerrorcommand onextra1 onextra2 oninput onload onnewtab onpageadvanced onpagehide onpagerewound onpageshow onpaneload onpopuphidden onpopuphiding onpopupshowing onpopupshown onsearchcomplete onselect ontextcommand ontextentered ontextrevert ontextreverted onunload onwizardback onwizardcancel onwizardfinish onwizardnext open ordinal orient pack pageid pageincrement pagestep parent parsetype persist persistence phase pickertooltiptext placeholder popup position predicate preference preference-editable primary priority pr...
...operties querytype readonly ref rel removeelement resizeafter resizebefore rows screenx screeny searchbutton searchsessions searchlabel selected selectedindex seltype setfocus showcaret showcommentcolumn showpopup size sizemode sizetopopup smoothscroll sort sortactive sortdirection sortresource sortresource2 spellcheck src state statedatasource statusbar statustext style subject substate suppressonselect tabindex tabscrolling targets template timeout title toolbarname tooltip tooltiptext tooltiptextnew top type uri useraction validate value var visuallyselected wait-cursor width windowtype wrap wraparound ...

Dynamically modifying XUL-based user interface - Archive of obsolete content
examples: using dom methods this section demonstrates the use of appendchild(), createelement(), insertbefore(), and removechild() dom methods.
...it uses document.createelementns() method to create the items, and insertbefore() with appendchild() to insert the created xml elements within the document.
... appendchild() appends the node after all other nodes, while insertbefore() inserts the node before the node referenced by its second parameter.
...abel) { const xul_ns = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"; var item = document.createelementns(xul_ns, "menuitem"); // create a new xul menuitem item.setattribute("label", alabel); return item; } var popup = document.getelementbyid("mypopup"); // a <menupopup> element var first = createmenuitem("first item"); var last = createmenuitem("last item"); popup.insertbefore(first, popup.firstchild); popup.appendchild(last); you can also use appendchild() and insertbefore() to move existing elements.

findbar - Archive of obsolete content
for example, the standard findbar in firefox 3.5 looks like this on the mac: you may attach a findbar to a particular browser element by either setting the findbar's browserid attribute to the id of the browser element before the findbar element is bound, or by setting the findbar's browser property to the browser element itself.
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata close() return type: no return value ...
... if the findbar hasn't been used before, find_normal is the default.
... if the findbar hasn't been used before, find_normal is the default.

insertItem - Archive of obsolete content
« xul reference home insertitem( id, beforenode, wrapper, beforepermanent ) not in seamonkey 1.x return type: element add an item with the given id to the toolbar.
... the new item is added just before the item given by the second argument.
... if the second argument is null, but the beforepermanent argument is true, the item is added to the beginning of the toolbar before the first permanent item.
... otherwise, if the beforepermanent argument is false, the new item is added to the end of the toolbar.

Attribute Substitution - Archive of obsolete content
for instance, to include a prefix before a variable value, you can use: <label value="my name is ?name"/> the effect will be that the ?name part of the attribute will be replaced by the value of the variable ?name.
...recall that the template builder doesn't load the datasource before processing a template.
...thus, if you use a variable set in a binding, you must ensure the datasource is loaded before the template is built, or just rebuild the template.
... another possibilty is to rearrange the rdf such that the values, in this example, the descriptions, are specified before the containers.

textbox (Toolkit autocomplete) - Archive of obsolete content
timeout type: integer for autocomplete textboxes, the number of milliseconds before the textbox starts searching for completions.
...for search textboxes, the number of milliseconds before the timer fires a command event.
...for timed textboxes, the number of milliseconds before the timer fires a command event.
...node(), comparedocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata getsearchat( index ) return type: str...

Textbox (XPFE autocomplete) - Archive of obsolete content
timeout type: integer for autocomplete textboxes, the number of milliseconds before the textbox starts searching for completions.
...for search textboxes, the number of milliseconds before the timer fires a command event.
...for timed textboxes, the number of milliseconds before the timer fires a command event.
...node(), comparedocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata addsession( session ) obsolete since g...

Tree Widget Changes - Archive of obsolete content
for example, nsitreeview.getcellvalue() takes a row index and a nsitreecolumn as arguments, whereas before it took a row index and a column id.
... one feature that has been added is restorenaturalorder which may be used to restore the original order of the columns before the user moved them around.
... the constants below have been changed, and their integer values are different: nsitreeview.indropbefore -> nsitreeview.drop_before (-1) nsitreeview.indropon -> nsitreeview.drop_on (0) nsitreeview.indropafter -> nsitreeview.drop_after (1) nsitreeview.progressnormal -> nsitreeview.progress_normal (1) nsitreeview.progressundetermined -> nsitreeview.progress_undetermined (2) nsitreeview.progressnode -> nsitre...
...eview.progress_none (3) as well, the drag and drop methods candropon and candropbeforeafter have been replaced with a single method candrop(idx,orientation) which handles both.

Accesskey display rules - Archive of obsolete content
however, if the last character of the label is an ellipsis or a colon, the accesskey text is inserted before them.
...this is controled by "intl.menuitems.insertseparatorbeforeaccesskeys" pref value.
... if the value is "true" (string), a spece will be inserted before accesskey text.
...therefore, xul toolkit removes accesskey text before setting the label to the buttons.

Localization - Archive of obsolete content
this line is typically placed just before the window element.
...play: none;" flex="1"> <treecols> <treecol id="name" label="&results.filename;" flex="1"/> <treecol id="location" label="&results.location;" flex="2"/> <treecol id="size" label="&results.size;" flex="1"/> </treecols> <treechildren> <treeitem> <treerow> <treecell label="mozilla"/> <treecell label="/usr/local"/> <treecell label="&bytes.before;2520&bytes.after;"/> </treerow> </treeitem> </treechildren> </tree> <splitter id="splitbar" resizeafter="grow" style="display: none;"/> <spacer class="titlespace"/> <hbox> <progressmeter id="progmeter" value="50%" style="display: none;"/> <spacer flex="1"/> <button id="find-button" label="&button.find;" oncommand="dofind()"/> <button id="cancel-button"...
...for example, the number might need to appear before the equivalent of 'bytes' instead of after.
...!entity findcriteria "search criteria"> <!entity type.name "name"> <!entity type.size "size"> <!entity type.date "date modified"> <!entity mode.is "is"> <!entity mode.isnot "is not"> <!entity casesensitive "case sensitive search"> <!entity matchfilename "match entire filename"> <!entity results.filename "filename"> <!entity results.location "location"> <!entity results.size "size"> <!entity bytes.before ""> <!entity bytes.after "bytes"> <!entity button.find "find"> <!entity button.cancel "cancel"> now, to add text for a new language all you need to do is create another dtd file.

Modifying a XUL Interface - Archive of obsolete content
three related functions are the insertbefore(), replacechild() and removechild functions.
... the syntax of these functions is as follows: parent.appendchild(child); parent.insertbefore(child, referencechild); parent.replacechild(newchild, oldchild); parent.removechild(child); it should be fairly straightforward from the function names what these functions do.
... the insertbefore() function inserts a new child node before an existing one.
...this is done recursively, so for large tree structures make sure that this is desired before passing true to the clonenode() function.

More Event Handlers - Archive of obsolete content
recall that the capturing phase occurs before the bubbling phase, so any capturing listeners will trigger before any bubbling listeners.
...for example, the 'popupshowing' event is sent to a popup just before it is displayed.
...load events the load event is sent to the document (the window tag) once the xul file has finished loading and just before the content is displayed.
... this event is commonly used to initialize fields and perform other tasks that need to be done before the user can use the window.

Popup Menus - Archive of obsolete content
before_start the popup appears above the element with the left edges of the element and the popup window aligned.
... before_end the popup appears above the element with the right edges of the element and the popup window aligned.
... end_before the popup appears to the right of the element with the top edges of the element and the popup window aligned.
... start_before the popup appears to the left of the element with the top edges of the element and the popup window aligned.

Using the Editor from XUL - Archive of obsolete content
editorstartup() does some other minor bits of setup before finally kicking off the url load, which the most important part here.
...we can't set that before xul parsing, so we have to force a load of the page we now want to edit.
...before each window is closed, javascript code in globaloverlay.js tries to call a trytoclose method on each window.
...these functions call beforeedit() and afteredit() on the current typing rules.

XUL element attributes - Archive of obsolete content
this attribute overrides the insertbefore attribute.
... insertbefore type: id when an element is in an overlay, the insertbefore attribute specifies the id of the element in the base window that the element should appear before.
...persistence will not remember the absence of an attribute, so for boolean attributes like checked where absence means false, you will need to explicitly set the attribute to false before the window closes (bug 15232).
...this attribute is ignored if either an insertbefore or insertafter attribute matches an element.

datepicker - Archive of obsolete content
dateleadingzero type: boolean a read only value indicating whether a leading zero should be displayed before the date when it is less than 10.
... monthleadingzero type: boolean a read only value indicating whether a leading zero should be displayed before the month when it is less than 10.
... yearleadingzero type: boolean a read only value indicating whether a leading zero should be displayed before the year when it is less than 1000.
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata related interfaces nsidomxulcontrole...

menupopup - Archive of obsolete content
onpopupshowing type: script code this event is sent to a popup just before it is opened.
... valid single-word values are after_start, after_end, before_start, before_end, end_after, end_before, start_after, start_before, overlap, at_pointer or after_pointer.
...node(), comparedocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata hidepopup() return type: ...
... position possible values for position are: before_start, before_end, after_start, after_end, start_before, start_after, end_before, end_after, overlap, and after_pointer.

prefwindow - Archive of obsolete content
attributes buttonalign, buttondir, buttonorient, buttonpack, buttons, defaultbutton, lastselected, onbeforeaccept, ondialogaccept, ondialogcancel, ondialogdisclosure, ondialoghelp, onload, onunload, title, type properties buttons, currentpane, defaultbutton, lastselected, preferencepanes, type methods acceptdialog, addpane, canceldialog, centerwindowonscreen, getbutton, opensubdialog, openwindow, showpane examples <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="te...
... onbeforeaccept type: script code the code in this attribute is called when the ok button is pressed or the acceptdialog method is called.
...node(), comparedocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata acceptdialog() return type...
...if you put other elements before the first <prefpane>, you possibly see strange behaviors about switching panes.

textbox - Archive of obsolete content
timeout type: integer for autocomplete textboxes, the number of milliseconds before the textbox starts searching for completions.
...for search textboxes, the number of milliseconds before the timer fires a command event.
...for timed textboxes, the number of milliseconds before the timer fires a command event.
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata style classes the following classes may...

timepicker - Archive of obsolete content
hourleadingzero type: boolean a read only value indicating whether a leading zero should be displayed before the hour when it is less than 10.
... minuteleadingzero type: boolean a read only value indicating whether a leading zero should be displayed before the minute when it is less than 10.
... secondleadingzero type: boolean a read only value indicating whether a leading zero should be displayed before the second when it is less than 10.
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata related interfaces nsidomxulcontrol...

tooltip - Archive of obsolete content
onpopupshowing type: script code this event is sent to a popup just before it is opened.
... valid single-word values are after_start, after_end, before_start, before_end, end_after, end_before, start_after, start_before, overlap, at_pointer or after_pointer.
...node(), comparedocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata hidepopup() return type: n...
... position possible values for position are: before_start, before_end, after_start, after_end, start_before, start_after, end_before, end_after, overlap, and after_pointer.

Archived Mozilla and build documentation - Archive of obsolete content
browsers, like internet explorer 4, that were built before the conception of w3c standards inherited many quirks.
...it is good style to check for these unwanted regressions and fixing them before checkin rather than causing bugzilla avalanches.
... when working with mozilla, you tend to accumulate patches which need to be reviewed, super-reviewed, and/or approved before they can be committed to the trunk.
... when you have only a few uncommitted patches, you can get by using cvs diff, and just editing the output to remove other patches before submitting.

Sunbird Theme Tutorial - Archive of obsolete content
you can use this kind of zip tool if you rename each file before and after using the tool.
...before and after the at-sign, it can only contain the characters a-z, a-z, 0-9, full stop, hyphen and underscore.
... fixing bug 320823 if you are using the sunbird 0.3a1 release, or a test build before 2005-12-21, then you must apply a fix for bug 320823 to allow sunbird to use themes.
...in your <tt>chrome.manifest</tt> file, add lines like this: skin communicator testing chrome/communicator/ skin global testing chrome/global/ skin help testing chrome/help/ skin mozapps testing chrome/mozapps/ replacing <tt>testing</tt> with your theme's one-word internal name as before.

Browser Feature Detection - Archive of obsolete content
e bottom true true true captionside true false true clear true true true clip true true true content true false true counterincrement true false true counterreset true false true cue true false false cueafter true false false cuebefore true false false cursor true true true direction true true true elevation true false false emptycells true false true fontsizeadjust true false true fontstretch true false true left true true true markeroffset true false true marks tr...
... true ie7 only true orphans true false true outline true false true outlinecolor true false true outlinestyle true false true outlinewidth true false true overflow true true true page true false true pagebreakafter true true true pagebreakbefore true true true pagebreakinside true false true pause true false true pauseafter true false true pausebefore true false true pitch true false false pitchrange true false true playduring false false false position true true true quotes ...
... false}, {name: 'bottom', 'supported': false}, {name: 'captionside', 'supported': false}, {name: 'clear', 'supported': false}, {name: 'clip', 'supported': false}, {name: 'content', 'supported': false}, {name: 'counterincrement', 'supported': false}, {name: 'counterreset', 'supported': false}, {name: 'cue', 'supported': false}, {name: 'cueafter', 'supported': false}, {name: 'cuebefore', 'supported': false}, {name: 'cursor', 'supported': false}, {name: 'direction', 'supported': false}, {name: 'elevation', 'supported': false}, {name: 'emptycells', 'supported': false}, {name: 'fontsizeadjust', 'supported': false}, {name: 'fontstretch', 'supported': false}, {name: 'left', 'supported': false}, {name: 'markeroffset', 'supported': false}, {name: 'marks', 'supported'...
...'minwidth', 'supported': false}, {name: 'orphans', 'supported': false}, {name: 'outline', 'supported': false}, {name: 'outlinecolor', 'supported': false}, {name: 'outlinestyle', 'supported': false}, {name: 'outlinewidth', 'supported': false}, {name: 'overflow', 'supported': false}, {name: 'page', 'supported': false}, {name: 'pagebreakafter', 'supported': false}, {name: 'pagebreakbefore', 'supported': false}, {name: 'pagebreakinside', 'supported': false}, {name: 'pause', 'supported': false}, {name: 'pauseafter', 'supported': false}, {name: 'pausebefore', 'supported': false}, {name: 'pitch', 'supported': false}, {name: 'pitchrange', 'supported': false}, {name: 'playduring', 'supported': false}, {name: 'position', 'supported': false}, {name: 'quotes', 'supported'...

Index - Game development
it is assumed that before reading this you have read our 3d collision detection introductory article first, and have basic knowledge about three.js.
... 49 game over 2d, beginner, canvas, games, javascript, phaser, tutorial, game over to make the game more interesting we can introduce the ability to lose — if you don't hit the ball before it reaches the bottom edge of the screen it will be game over.
... 50 initialize the framework 2d, beginner, canvas, games, html, javascript, phaser, tutorial before we can start writing the game's functionality, we need to create a basic structure to render the game inside.
... 63 create the canvas and draw on it 2d, beginner, canvas, games, html, javascript, tutorial before we can start writing the game's functionality, we need to create a basic structure to render the game inside.

Building up a basic demo with Babylon.js - Game development
before reading on, copy this code to a new text file and save it in your working directory as index.html.
... initialising the babylon.js engine we have to create a babylon.js engine instance first (passing it the <canvas> element to render on) before we start developing our game.
...add these lines at the end of the <script> element, just before the closing </script>.
...define a helper variable — t — that we will use for animations, just before the renderloop, and decrement it on every frame inside the loop, like this: var t = 0; var renderloop = function () { scene.render(); t -= 0.01; // animation code goes here }; engine.runrenderloop(renderloop); the t variable will be incremented on every rendered frame.

Building up a basic demo with PlayCanvas editor - Game development
you can finish this before you continue our tutorial if you like.
... now follow the same steps as we did before when coloring the cube: create a new material using the add asset (plus) button.
...as you can see, the file contains some boilerplate code already: pc.script.create('boxanimation', function (app) { // creates a new boxanimation instance var boxanimation = function (entity) { this.entity = entity; }; boxanimation.prototype = { // called once after all resources are loaded and before the first update initialize: function () { }, // called every frame, dt is time in seconds since last update update: function (dt) { } }; return boxanimation; }); the most interesting part is the update() function, which is where we can put any code that we want repeated on every frame.
... add the coneanimation.js script to the cone object, as before.

Plug-in Development Overview - Gecko Plugin API Reference
drawing a plug-in instance before drawing itself on the page, the plug-in must provide information about itself, set the window or other target in which it draws, arrange for redrawing, and handle events.
... npn_invalidaterect: invalidate an area in a windowless plug-in before repainting or refreshing.
... npn_invalidateregion: invalidate an area in a windowless plug-in before repainting or refreshing.
... use the npn_memflush method to free memory (mac os only) before calling memory-intensive mac toolbox calls.

Sizing items in CSS - Learn web development
the natural or intrinsic size of things html elements have a natural size, set before they are affected by any css.
...for example, if you want a full-page hero section to show before the rest of your content, making that part of your page 100vh high will push the rest of the content below the viewport, meaning that it will only appear once the document is scrolled.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: sizing.
...when you move onto css layout, sizing will become very important in mastering the different layout methods, so it is worth understanding the concepts here before moving on.

Flexbox - Learn web development
try adding the following declaration to your <section> rule: flex-direction: column; you'll see that this puts the items back in a column layout, much like they were before we added any css.
... before you move on, delete this declaration from your example.
... we'd like to encourage you to play with these values to see how they work before you continue.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: flexbox.

Grids - Learn web development
you can mix fr units and fixed length tracks — in such a case the space needed for the fixed tracks is taken away before the space is distributed to the other tracks.
...change your track listing to the following: .container { display: grid; grid-template-columns: repeat(3, 1fr); grid-gap: 20px; } you will now get 3 1fr tracks just as before.
... .container { display: grid; grid-template-areas: "header header" "sidebar content" "footer footer"; grid-template-columns: 1fr 3fr; grid-gap: 20px; } header { grid-area: header; } article { grid-area: content; } aside { grid-area: sidebar; } footer { grid-area: footer; } reload the page and you will see that your items have been placed just as before without us needing to use any line numbers!
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: grids.

CSS layout - Learn web development
get started prerequisites before starting this module, you should already: have basic familiarity with html, as discussed in the introduction to html module.
...after studying this guide you can test your flexbox skills to check your understanding before moving on.
...this article will give you all you need to know to get started with page layout, then test your grid skills before moving on.
... legacy layout methods grid systems are a very common feature used in css layouts, and before css grid layout they tended to be implemented using floats or other layout features.

Using CSS generated content - Learn web development
examples text content css can insert text content before or after an element.
... to specify this, make a rule and add ::before or ::after to the selector.
... html a text where i need to <span class="ref">something</span> css .ref::before { font-weight: bold; color: navy; content: "reference "; } output the character set of a stylesheet is utf-8 by default, but it can also be specified in the link, in the stylesheet itself, or in other ways.
... image content to add an image before or after an element, you can specify the url of an image file in the value of the content property.

Fundamental text and font styling - Learn web development
note: if the above paragraph leaves you feeling confused, then no matter — go back and review our box model article, to brush up on the box model theory, before carrying on.
... text layout styles: text-indent: specify how much horizontal space should be left before the beginning of the first line of the text content.
... text-align-last: define how the last line of a block or a line, right before a forced line break, is aligned.
... this assessment tests all the knowledge discussed in this module, so you might want to read the other articles before moving on to it.

Learn to style HTML using CSS - Learn web development
get started prerequisites you should learn the basics of html before attempting any css.
... before starting this topic, you should also be familiar with using computers and using the web passively (i.e., just looking at it, consuming the content).
... it is recommended that you work through getting started with the web before proceeding with this topic.
... the aim here is to provide you with a toolkit for writing competent css and help you understand all the essential theory, before moving on to more specific disciplines like text styling and css layout.

Client-side form validation - Learn web development
previous overview: forms next before submitting data to the server, it is important to ensure all required form controls are filled out, in the correct format.
...we've seen many of these earlier in the course, but to recap: required: specifies whether a form field needs to be filled in before the form can be submitted.
...that means that even though the browser doesn't automatically check the validity of the form before sending its data, you can still do it yourself and style the form accordingly.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: form validation.

Images in HTML - Learn web development
fortunately, it wasn't too long before the ability to embed images (and other more interesting types of content) inside web pages was added.
... note: you should read a quick primer on urls and paths to refresh your memory on relative and absolute urls before continuing.
...you should use an image editor to put your image at the correct size before putting it on your webpage.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: html images.

Responsive images - Learn web development
in this case, before each comma we write: a media condition ((max-width:600px)) — you'll learn more about these in the css topic, but for now let's just say that a media condition describes a possible state that the screen can be in.
... in all cases, you must provide an <img> element, with src and alt, right before </picture>, otherwise no images will appear.
... when the browser starts to load a page, it starts to download (preload) any images before the main parser has started to load and interpret the page's css and javascript.
...the only thing to do now before moving on is to try our multimedia assessment, and see how you get on.

General asynchronous programming concepts - Learn web development
you should understand these concepts before working through the other articles in the module.
...each thread can only do a single task at once: task a --> task b --> task c each task will be run sequentially; a task has to complete before the next one can be started.
...now when you click the button, the browser is able to display the paragraph before the dates have finished calculating.
...the fetching of an image from the server), and then wait until the result has returned before running another operation: main thread: task a task b promise: |__async operation__| since the operation is happening somewhere else, the main thread is not blocked while the async operation is being processed.

Introducing asynchronous JavaScript - Learn web development
instead, you need your code to wait until the response is returned before it tries to do anything else to it.
...in this case the callback is waiting on the xhr call to finish downloading the resource (using the onload event handler) before it passes it to the callback.
...the following example is fairly similar to what we've seen before (see it live, and the source).
...you just can't guarantee that the async function will return before the browser has processed the sync block.

Build your own function - Learn web development
we've seen this before, but let's just refresh our memories.
... if you tried the last experiment, make sure to undo the last change before carrying on.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: functions.
... these tests require skills that are covered in the next article, so you might want to read those first before trying it.

Silly story generator - Learn web development
prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
... replaces the default name "bob" in the story with a custom name, only if a custom name is entered into the "enter custom name" text field before the generate button is pressed.
... converts the default us weight and temperature quantities and units in the story into uk equivalents if the uk radio button is checked before the generate button is pressed.
...put it just before the closing </body> tag.

What went wrong? Troubleshooting JavaScript - Learn web development
the instance that stores the random number that we want to guess at the start of the game should be around line number 44: let randomnumber = math.floor(math.random()) + 1; and the one that generates the random number before each subsequent game is around line 113: randomnumber = math.floor(math.random()) + 1; to check whether these lines are indeed the problem, let's turn to our friend console.log() again — insert the following line directly below each of the above two lines: console.log(randomnumber); save and refresh, then play a few games — you'll see that randomnumber is equal to 1 at each point ...
... we need to multiply the random number by 100 before we round it down.
... syntaxerror: missing ; before statement this error generally means that you have missed a semicolon at the end of one of your lines of code, but it can sometimes be more cryptic.
... note: see our syntaxerror: missing ; before statement reference page for more details about this error.

Introducing JavaScript objects - Learn web development
get started prerequisites before starting this module, you should have some familiarity with html and css.
... you are advised to work through the introduction to html and introduction to css modules before starting on javascript.
... you should also have some familiarity with javascript basics before looking at javascript objects in detail.
... before attempting this module, work through javascript first steps and javascript building blocks.

Getting started with Ember - Learn web development
you'll need node and npm installed before you can install ember-cli.
...make sure you navigate to somewhere appropriate in the terminal before you run it.
... getting ready to build our ember project you'll need a code editor before continuing to interact with your brand new project.
... in ember-cli-build.js, find the following code: let app = new emberapp(defaults, { // add options here }); add the following lines underneath it before saving the file: app.import('node_modules/todomvc-common/base.css'); app.import('node_modules/todomvc-app-css/index.css'); for more information on what ember-cli-build.js does, and for other ways in which you can customize your build / pipeline, the ember guides have a page on addons and dependencies.

React interactivity: Editing, filtering, conditional rendering - Learn web development
first, import usestate into the todo component like we did before with the app component, by updating the first import statement to this: import react, { usestate } from "react"; we'll now use this to set an isediting state, the default state of which should be false.
...editingtemplate : viewtemplate}</li>; your browser should render all your tasks just like before.
...still in todo.js, put the following underneath the existing hook: const [newname, setnewname] = usestate(''); next, create a handlechange() function that will set the new name; put this underneath the hooks but before the templates: function handlechange(e) { setnewname(e.target.value); } now we'll update our editingtemplate's <input /> field, setting a value attribute of newname, and binding our handlechange() function to its onchange event.
...before we map over the tasks state, we should filter it (with array.prototype.filter()) to eliminate objects we don't want to render.

Beginning our React todo list - Learn web development
defining user stories before we begin our work will help us focus our work.
... implementing our styles paste the following css code into src/index.css so that it replaces what's currently there: /* resets */ *, *::before, *::after { box-sizing: border-box; } *:focus { outline: 3px dashed #228bec; outline-offset: 0; } html { font: 62.5% / 1.15 sans-serif; } h1, h2 { margin-bottom: 0; } ul { list-style: none; padding: 0; } button { border: none; margin: 0; padding: 0; width: auto; overflow: visible; background: transparent; color: inherit; font: inherit; line-height: normal; -webki...
...rem 0.8rem; border: 2px solid #565656; } .todo-text:focus { box-shadow: inset 0 0 0 2px; } /* checkbox styles */ .c-cb { box-sizing: border-box; font-family: arial, sans-serif; -webkit-font-smoothing: antialiased; font-weight: 400; font-size: 1.6rem; line-height: 1.25; display: block; position: relative; min-height: 44px; padding-left: 40px; clear: left; } .c-cb > label::before, .c-cb > input[type="checkbox"] { box-sizing: border-box; top: -2px; left: -2px; width: 44px; height: 44px; } .c-cb > input[type="checkbox"] { -webkit-font-smoothing: antialiased; cursor: pointer; position: absolute; z-index: 1; margin: 0; opacity: 0; } .c-cb > label { font-size: inherit; font-family: inherit; line-height: inherit; display: inline-block; margin-bot...
...tom: 0; padding: 8px 15px 5px; cursor: pointer; touch-action: manipulation; } .c-cb > label::before { content: ""; position: absolute; border: 2px solid currentcolor; background: transparent; } .c-cb > input[type="checkbox"]:focus + label::before { border-width: 4px; outline: 3px dashed #228bec; } .c-cb > label::after { box-sizing: content-box; content: ""; position: absolute; top: 11px; left: 9px; width: 18px; height: 7px; transform: rotate(-45deg); border: solid; border-width: 0 0 5px 5px; border-top-color: transparent; opacity: 0; background: transparent; } .c-cb > input[type="checkbox"]:checked + label::after { opacity: 1; } save and look back at your browser, and your app should now have reasonable styling.

Starting our Svelte Todo list app - Learn web development
moreover, our editor can display this warning even before calling the compiler: you can tell svelte to ignore this warning for the next block of markup with a comment beginning with svelte-ignore, like this: <!-- svelte-ignore a11y-missing-attribute --> <img height="32" width="88" src="https://udn.realityripple.com/samples/b0/98dase3c7d.png"> note: with vscode you can automatically add this ignore comment by clicking on the quick fix...
...replace the contents of the file public/global.css with the following: /* resets */ *, *::before, *::after { box-sizing: border-box; } *:focus { outline: 3px dashed #228bec; outline-offset: 0; } html { font: 62.5% / 1.15 sans-serif; } h1, h2 { margin-bottom: 0; } ul { list-style: none; padding: 0; } button { border: none; margin: 0; padding: 0; width: auto; overflow: visible; background: transparent; color: inherit; font: inherit; line-height: normal; -webki...
...rem 0.8rem; border: 2px solid #565656; } .todo-text:focus { box-shadow: inset 0 0 0 2px; } /* checkbox styles */ .c-cb { box-sizing: border-box; font-family: arial, sans-serif; -webkit-font-smoothing: antialiased; font-weight: 400; font-size: 1.6rem; line-height: 1.25; display: block; position: relative; min-height: 44px; padding-left: 40px; clear: left; } .c-cb > label::before, .c-cb > input[type="checkbox"] { box-sizing: border-box; top: -2px; left: -2px; width: 44px; height: 44px; } .c-cb > input[type="checkbox"] { -webkit-font-smoothing: antialiased; cursor: pointer; position: absolute; z-index: 1; margin: 0; opacity: 0; } .c-cb > label { font-size: inherit; font-family: inherit; line-height: inherit; display: inline-block; margin-bot...
...tom: 0; padding: 8px 15px 5px; cursor: pointer; touch-action: manipulation; } .c-cb > label::before { content: ""; position: absolute; border: 2px solid currentcolor; background: transparent; } .c-cb > input[type="checkbox"]:focus + label::before { border-width: 4px; outline: 3px dashed #228bec; } .c-cb > label::after { box-sizing: content-box; content: ""; position: absolute; top: 11px; left: 9px; width: 18px; height: 7px; transform: rotate(-45deg); border: solid; border-width: 0 0 5px 5px; border-top-color: transparent; opacity: 0; background: transparent; } .c-cb > input[type="checkbox"]:checked + label::after { opacity: 1; } with our markup styled, everything now looks better: the code so far git to see the state of the code as it should be...

Advanced Svelte: Reactivity, lifecycle, accessibility - Learn web development
to start with, add the following line at the beginning of the newtodo.svelte <script> section: import { onmount } from 'svelte' and these lines at the end of it: console.log('initializing:', nameel) onmount( () => { console.log('mounted:', nameel) }) now remove the if (autofocus) nameel.focus() line to avoid throwing the error we were seeing before.
... we could achieve all this in our todo component whenever we add or remove the <input> from the dom, but we would have to be very careful to add the event listener after the node has been added to the dom, and remove the listener before the node is removed from the dom.
... import selectonfocus() from actions.js in this file too, as before: import { selectonfocus } from '../actions.js' add the use:selectonfocus directive to the <input>, like this: <input bind:value={name} bind:this={nameel} use:selectonfocus type="text" id="todo-0" autocomplete="off" class="input input__lg" /> with a few lines of code we can add functionality to regular html elements, in a very reusable and declarative way.
... our onedit() function can now be much simpler: function onedit() { editing = true // enter editing mode } as a last example before we move on, let's go back to our todo.svelte component and give focus to the edit button after the user presses save or cancel.

Handling common accessibility problems - Learn web development
if you are inventing them yourself, you need to make sure that they are keyboard accessible; if you are using some kind of third-party framework, carefully review the options available to see how accessible they are before diving in.
...if you've not used vo before, you will be given a welcome screen where you can choose to start vo or not, and run through a rather useful tutorial to learn how to use it.
...you can choose whether to make a donation or download it for free; you'll also need to give them your e-mail address before you can download it.
...in the case of nvda, the modifier can either be insert (the default), or capslock (can be chosen by checking the first checkbox in the nvda welcome dialog before pressing ok).

Introduction to automated testing - Learn web development
with the in-built image editor, highlight your screenshot before you push it to your colleagues.
...use a different directory name than before, like sauce-test for example.
...use a different directory name than before, like bstack-test for example.
...use a different directory name than before, like tb-test for example.

Implementing feature detection - Learn web development
before we move on, we'd like to say one thing upfront — don't confuse feature detection with browser sniffing (detecting what specific browser is accessing the site) — this is a terrible practice that should be discouraged at all costs.
... next, add a <script></script> element at the bottom of your body (just before the closing </body> tag).
...this needs to be applied to the page before any css (or javascript) that might make use of it.
... finally, add another <script> element at the bottom of the html body (just before the </body> tag), and put the following script inside the tags: if (modernizr.geolocation) { navigator.geolocation.getcurrentposition(function(position) { let latlng = new google.maps.latlng(position.coords.latitude,position.coords.longitude); let myoptions = { zoom: 8, center: latlng, maptypeid: google.maps.maptypeid.terrain, disabledefaultui: true } ...

Handling common HTML and CSS problems - Learn web development
first things first: fixing general problems we said in the first article of this series that a good strategy to begin with is to test in a couple of modern browsers on desktop/mobile, to make sure your code is working generally, before going on to concentrate on the cross browser issues.
... in our debugging html and debugging css articles, we provided some really basic guidance on debugging html/css — if you are not familiar with the basics, you should definitely study these articles before carrying on.
... put the following code into the head of your html document, just before the opening <style> tag: <script type="text/javascript" src="mootools-core-1.6.0.js"></script> <!--[if (gte ie 6)&(lte ie 8)]> <script type="text/javascript" src="selectivizr-min.js"></script> <![endif]--> if you try running this in an old version of ie, it should work fine.
...you are advised to look and see if there is an answer to your question already, before posting a new question.

Introduction to cross browser testing - Learn web development
before you even get to cross browser issues, you should have already fixed out bugs in your code (see debugging html, debugging css, and what went wrong?
...no more new work done on them) a long time before a new feature was even invented.
...for example, if the e-commerce site owner wants a webgl-powered 3d tour of each product built into the product pages, they will need to accept that this just won't work in ie versions before 11.
...the most important thing is that you test each small part before committing it — don't leave all the testing till the end!

Client-side tooling overview - Learn web development
from time to time, even the most experienced of web developers get stuck on a tooling problem; it is possible to waste hours attempting to get a tooling pipeline working before even touching a single line of application code.
... bundlers/packagers these are tools that get your code ready for production, for example by “tree-shaking” to make sure only the parts of your code libraries that you are actually using are put into your final production code, or "minifying" to remove all the whitespace in your production code, making it as small as possible before it is uploaded to a server.
... testing tools these generally take the form of a tool that will automatically run tests against your code to make sure it is correct before you go any further (for example, when you attempt to push changes to a github repo).
... you’ll probably need a combination of the following things: experienced teachers, mentors, fellow students, or colleagues that have some experience, have solved such problems before, and can give advice.

Old Thunderbird build
building thunderbird before you start, make sure that the version you checked out is not busted.
... then just re-run the mach command above (you can do the addition before running mach for the first time).
...to run the executable from your comm-central working directory: windows: obj-.../dist/bin/thunderbird.exe linux: obj-.../dist/bin/thunderbird os x: obj-.../dist/daily.app/contents/macos/thunderbird how to update and build again in your comm-central directory, run the same command as before: python client.py checkout then just re-run the mach command above.
... if on windows you get link errors like "lnk1102: out of memory" or "lnk1318: unexpected pdb error; ok (0)", try deleting the largest .pdb files before rushing out the door to buy more ram.

Eclipse CDT Manual Setup
before you proceed any further, check that your changes to eclipse's memory limits have taken effect and are present in eclipse/help > about eclipse > installation details > configuration.
... whenever you create a new workspace for a mozilla source tree, you should be sure to turn off the following two settings in the workspace preferences (window > preferences, or eclipse > preferences) before creating a project in that workspace: in "general > workspace", disable "build automatically" in "c/c++ > indexer", disable "automatically update the index" turning off automatic indexing prevents the cpu intensive indexer from running at various stages during the steps below before we're ready.
...(if an "indexing" item starts after the "refreshing the workspace" item has finished, click the little red box beside that item to cancel it, since we want to configure the project before the indexer runs.) initial project properties so that the indexer will run faster and give better results, and so that eclipse doesn't give results for irrelevant files, you should add some resource filters to have eclipse ignore certain non-source files and directories.
... if the main object directory for your source tree is a fennec build: in the "cdt gcc build output parser", change the compiler command pattern to (.*gcc)|(.*[gc]\+\+)|(clang) (before this change it should have been "(gcc)|([gc]\+\+)|(clang)").

Experimental features in Firefox
you can test your web sites and applications before these features get released and ensure everything will still work with the latest web technology capabilities.
... nightly 73 no developer edition 73 no beta 73 no release 73 no preference name dom.webgpu.enabled html dom api global event: beforeinput the global beforeinput event is sent to an <input> element—or any element whose contenteditable attribute is enabled—immediately before the element's value changes.
... nightly 74 no developer edition 74 no beta 74 no release 74 no preference name dom.input_events.beforeinput.enabled htmlmediaelement method: setsinkid() htmlmediaelement.setsinkid() allows you to set the sink id of an audio output device on an htmlmediaelement, thereby changing where the audio is being output.
...we experiment with new ideas, add new features, and test them on the nightly and developer edition channels before letting them go through to beta and release.

DeferredTask.jsm
multiple attempts to run the same task before the delay will be coalesced.
...multiple attempts to run the task before the delay has passed are coalesced.
...it is, however, possible to arm the timer again during the execution of the task, in which case the task will need to finish before the timer is started again, thus guaranteeing a time of inactivity between executions that is at least equal to the provided delay.
... for example, during shutdown, you may want to ensure that any pending write is processed, using the latest version of the data if the timer is armed: asyncshutdown.profilebeforechange.addblocker( "example service: shutting down", () => savedeferredtask.finalize() ); instead, if you are going to delete the saved data from disk anyways, you might as well prevent any pending write from starting, while still ensuring that any write that is currently in progress terminates, so that the file is not in use any more: savedeferredtask.disarm(); savedeferredtask.finalize().

QA phase
/hg.mozilla.org/releases/mozilla-aurora )/ l10n-central (directory for l10n directories, one per l10n; often referred to as "l10n base")/ your-locale-code (a directory with your l10n files, in this example we'll use x-testing) example: root/mozilla-aurora & root/l10n-central/x-testing additionally, you will need to copy and translate the toolkit/defines.inc file directly from en-us before you can build.
...before a team becomes official, we like to get the localizers comfortable with the hg commands that allow for cloning, pulling, committing, and pushing work to an experimental repository.
... note: you must have mercurial configured before you begin.
... pushing to your repository there are a couple of things you should take note of before you push to your repository: make sure that your files have been encoded in unicode without bom (byte order mark).

SVN for Localizers
note: if you do not already have access to svn, visit this wiki page on how to get set up with an svn account before proceeding.
... you can also run svn status to check the list of modified files (they'll display a m before the name) you're about to commit.
...it's very important for you to update your working copy with the newest files from mozilla svn repository before you start making changes.
...as a general rule, you should at least do it before translating anything.

Localization sign-off reviews
does not need to be approved before revision merge between release channels, although it is recommended.
... how it all works a large part of the review process takes place before you even submit your request for a sign-off review.
...so before you request your sign-off review, be sure that it is as ready as it can be.
...once they are fixed, push your fix to your repo, attach it to the corresponding bug using the same mercurial revision number as before, and then request another review.

Localization technical reviews
more intl.properties checkpoints, cont we also check the plural rule for the locale, that the general.useragent.locale is set to the locale code, that accept-lang shows the locale code(s) (like ab, ab-cd,...) and is followed by en and en-us, and finally that intl.menuitems.insertseparatorbeforeaccesskeys = true, where "true" should be left untranslated.
...most locales should have the following: #filter substitution pref("general.useragent.locale", "@ab_cd@") how it all works a large part of the review process takes place before you even submit your request for a technical review.
...so before you request your technical review, be sure that it is as ready as it can be.
...once they are fixed, push your fix to your repo, attach it to the corresponding bug using the same mercurial revision number as before, and then request another review.

DMD
desktop firefox (linux) build build firefox with these options: ac_add_options --enable-dmd if building via try server, modify browser/config/mozconfigs/linux64/common-opt or a similar file before pushing.
... desktop firefox (mac) build build with these options: ac_add_options --enable-dmd if building via try server, modify browser/config/mozconfigs/macosx64/common-opt or a similar file before pushing.
...you can do this by running: adb push $objdir/dist/bin/libdmd.so /sdcard/ second, you will need to make an executable wrapper for fennec which sets an environment variable before launching it.
... launch launch fennec either by tapping on the icon as usual, or from the command line (as before, be sure to replace org.mozilla.fennec_$username with the app identifier as appropriate).

Gecko Profiler FAQ
in the end, you should have one big “before” profile and one big “after” profile.
...the only way that i’ve tried before is to use a “difference calltree”: in the regular call tree, each node of the calltree is assigned a weight which is just the number of samples that were under this call stack.
... in a difference call tree, each node’s weight instead is computed as <number of samples under this stack in the “after” profile> minus <number of samples under this stack in the “before” profile>.
... but the short answer is picking up real browser workloads, and finding ways to split out the overall cost contributed by the thing that your change is going to affect and compare things before and after.

pkfnc.html
this function will return the newest certificate that matches the subject, based on the notbefore / notafter fields of the certificate.
...if you want to preserve it, copy the string before freeing the slot.
...if you want to preserve it, copy the string before freeing the slot.
... several functions in the nss libraries use the password callback function to obtain the password before performing operations that involve the protected information.

NSS_3.12.3_release_notes.html
this was allowed by default before nss 3.12.3.
... nss_strict_nofork string ("1", "disabled", or any other non-empty value) it is an error to try to use a pkcs#11 crypto module in a process before it has been initialized in that process, even if the module was initialized in the parent process.
... nss_use_decoded_cka_ec_point boolean (any non-empty value to enable) tells nss to send ec key points across the pkcs#11 interface in the non-standard unencoded format that was used by default before nss 3.12.3.
...this behavior was the default before nss 3.12.3.

Hacking Tips
if you want to know at which lir the code is failing at, the js::ion::codegenerator::generatebody function can be intrumented to dump the lir id before each instruction.
...external programs such as iongraph, dot, and your png viewer are search into the path, otherwise custom one can either be configured with environment variables (gdb_iongraph, gdb_dot, gdb_pngviewer) before starting gdb, or with gdb parameters (set iongraph-bin <path>, set dot-bin <path>, set pngviewer-bin <path>) within gdb.
... using rr on a test get the command line for your test run using -s: ./jit_test.py -s $js_shell saved-stacks/async.js insert 'rr' before the shell invocation: rr $js_shell -f $js_src/jit-test/lib/prolog.js --js-cache $js_src/jit-test/.js-cache -e "const platform='linux2'; const libdir='$js_src/jit-test/lib/'; const scriptdir='$js_src/jit-test/tests/saved-stacks/'" -f $js_src/jit-test/tests/saved-stacks/async.js (note that the above is an example; simply setting js_shell and js_src will not work).
... dumping the javascript heap from the shell, you can call the dumpheap before firefox function to dump out all gc things (reachable and unreachable) that are present in the heap.

Garbage collection
if the allocation rate is high during incremental gc, the engine may run out of memory before finishing the incremental gc.
... the write barrier is a piece of code that runs just before a pointer store occurs and records just enough information to make sure that live objects don't get collected.
...live cells will be marked either because they're reachable or because they were marked by a pre-barrier before being removed from the graph.
...js::nativeobject::privatewritebarrierpre takes care of this by invoking the jsobject's class trace hook before the private field is set.

Secure Development Guidelines
bbv: stack overflow example: void foo(char *bar) { char c[12]; strcpy(c, bar); } int main(int argc, char **argv) { foo(argv[1]); } bbv: stack overflow before the stack overflow bbv: stack overflow after the stack overflow bbv: heap overflow dynamic memory malloc() calloc() heapalloc() mmap() not on the stack segment!
...o_something(); delete ptr1; do_something_else(); ptr2 = new char[-1] // oom } catch (...) { delete ptr1; delete ptr2; } new will throw an exception — ptr1 is already freed in the try block then freed again in the catch block freeing un-initialized data free data in the catch block assumption is that it’s initialized in the try block if the try block throws before the variable is initialized, the catch block will operate on un-intialized data freeing un-initialized data example: int main(){ char *ptr; try { ptr = new char[-1]; // oom } catch(...) { delete ptr; } } freeing un-initialized data: prevention be careful when freeing data in catch blocks make sure the try block can’t throw before data is initia...
...lized initialize variables when they’re declared; for example, set pointers to null memory leaks usually occur when memory is allocated in a try block after the allocation, something throws in the try block before memory is freed in the try block the catch block does not foresee this and doesn't free the memory freeing un-initialized data example: int main(){ char *p; try { p = new char [1000]; ...
... } } memory leaks: prevention any acquired resource in a try block should be freed in a catch block (if the try block throws before the resource is freed) might be helpful to initialize variables null for pointers -1 for file descriptors ...

mozIStorageStatement
you must call this method on every active statement before you try to call mozistorageconnection.close().
...this must be called before reusing the statement.
... note: the statement does not have to be reset before being reused.
... note: the statement must be reset before being reused.

nsIDOMEvent
if the event was retargeted for some reason other than an anonymous boundary crossing, this will be set to the target before the retargeting occurs.
... originaltarget nsidomeventtarget the original target of the event, before any retargetings.
...this method may only be called before the event has been dispatched via the dispatchevent method, though it may be called multiple times during that phase if necessary.
...the event will complete dispatch to all listeners on the current eventtarget before event flow stops.

nsIDocShell
forcedcharset nsiatom a character set to override the page's default character set while processing; this is tried before using any other character set during page loads.
... isinunload boolean find out whether the docshell is currently in the middle of a page transition (after the onunload event has fired, but before the new document has been set up) read only.
... busy_flags_before_page_load 2 returned by the busyflags attribute when the nsidocshell has started loading a document from the network, but no data has been received yet.
...called by the document before initiating an out of band document.write().

nsIJSON
don't forget to gcroot the result before using it.
...don't forget to gcroot the jsval before using it.
...don't forget to gcroot the result before using it.
...don't forget to gcroot the jsval before using it.

nsINavHistoryObserver
method overview void onbeforedeleteuri(in nsiuri auri, in acstring aguid); obsolete since gecko 21.0 void onbeginupdatebatch(); void onclearhistory(); void ondeleteuri(in nsiuri auri, in acstring aguid); void ondeletevisits(in nsiuri auri, in prtime avisittime, in acstring aguid); void onendupdatebatch(); void onpagechanged(in nsiuri auri, in unsigned long awhat, in astr...
... methods onbeforedeleteuri() obsolete since gecko 21.0 (firefox 21.0 / thunderbird 21.0 / seamonkey 2.18) note: this method was removed in gecko 21.0 as part of bug 826409.
... note: see using onbeforedeleteuri() in gecko 1.9.1 for how to implement this in gecko 1.9.1 void onbeforedeleteuri( in nsiuri auri, in acstring aguid ); parameters auri the uri of the page about to be deleted.
... using onbeforedeleteuri() in gecko 1.9.1 if you wish to support onbeforedeleteuri() in applications based on gecko 1.9.1, you must implement your observer's queryinterface() method to match on both nsinavhistoryobserver and nsinavhistoryobserver_mozilla_1_9_1_additions, as shown below.

Setting HTTP request headers
in particular, to get the nsihttpchannel just before the http request is made we need to observe the "http-on-modify-request" topic.
...it is the same code we used before, earlier in this article, to add the http request header.
...we are saying we want httprequestobserver to be notified (by calling its observe method) when a "http-on-modify-request" topic takes place (which we know happens just before each http request).
...while the previous version we showed before was good for learning, in an actual real-world application, you'd probably want to code it more like the following.

Storage
the latter will allow all ongoing transactions to complete before closing the connection, and will optionally notify you via callback when the connection is closed.
...once all the parameters are set up, a single call to mozistoragestatement.bindparameters() will ensure that the parameters are bound before execution.
... you can then execute the statement asynchronously, and the statement will get each set of bindings bound to it before execution asynchronously.
...you should do this before you reuse the statement.

Getting Started Guide
if you have never used nscomptrs before, this section is for you.
...clients are expected to keep this reference count accurate by incrementing it when they acquire a reference to the interface, and decrementing it before they let go.
...if you were to use a raw pointer instead, your function couldn't know what ownership relationship the caller had to the input value, and hence, couldn't know whether to release it or not before assigning in the new value.
...an nscomptr always calls release before letting go, whether the nscomptr is letting go so that it can point to a different object, or because the nscomptr is going out of scope.

Plug-in Development Overview - Plugins
drawing a plug-in instance before drawing itself on the page, the plug-in must provide information about itself, set the window or other target in which it draws, arrange for redrawing, and handle events.
... npn_invalidaterect: invalidate an area in a windowless plug-in before repainting or refreshing.
... npn_invalidateregion: invalidate an area in a windowless plug-in before repainting or refreshing.
... use the npn_memflush method to free memory (mac os only) before calling memory-intensive mac toolbox calls.

Streams - Plugins
in general, this mode is more expensive, because the entire stream must be downloaded to a temporary file before use unless the stream comes from a local file or an http server that supports the byte-range extension to http.
... finding out how much data the plug-in can accept after a call to npp_newstream and before writing data to the plug-in, the browser calls npp_writeready to determine the maximum number of bytes that the plug-in can consume.
...the browser calls npp_writeready before each call to npp_write.
...the browser must download the entire stream to a temporary file before it can be used, unless the stream comes from a local file or an http server that supports the byte-range extension to http.

Index - Firefox Developer Tools
38 aggregate view before firefox 48, this was the default view of a heap snapshot.
... after firefox 48, the default view is the tree map view, and you can switch to the aggregate view using the dropdown labeled "view:": 39 basic operations before firefox 50, the memory tool is not enabled by default.
... 83 allocations to enable the allocations view, you must check "record allocations" in the performance tool settings, before recording a profile.
... 158 about:debugging (before firefox 68) the about:debugging page provides a single place from which you can attach the firefox developer tools to a number of debugging targets.

Element.insertAdjacentHTML() - Web APIs
syntax element.insertadjacenthtml(position, text); parameters position a domstring representing the position relative to the element; must be one of the following strings: 'beforebegin': before the element itself.
... 'afterbegin': just inside the element, before its first child.
... 'beforeend': just inside the element, after its last child.
... visualization of position names <!-- beforebegin --> <p> <!-- afterbegin --> foo <!-- beforeend --> </p> <!-- afterend --> note: the beforebegin and afterend positions work only if the node is in the dom tree and has a parent element.

Comparison of Event Targets - Web APIs
event.explicitoriginaltarget event.webidl if the event was retargeted for some reason other than an anonymous boundary crossing, this will be set to the target before the retargeting occurs.
... event.originaltarget event.webidl the original target of the event, before any retargetings.
... event.composedtarget event.webidl the original non-native target of the event before composition from shadow dom.
... <td class="standard">target who's event listener is being processed <small>event.currenttarget</small></td> <td class="standard">identify other element (if any) involved in the event <small>event.relatedtarget</small></td> <td class="non-standard">if there was a retargetting of the event for some reason <small> event.explicitoriginaltarget</small> contains the target before retargetting (never contains anonymous targets)</td> <td class="non-standard">if there was a retargetting of the event for some reason <small> event.originaltarget</small> contains the target before retargetting (may contain anonymous targets)</td> </tr> </thead> <tr> <td id="target"></td> <td id="currenttarget"></td> <td id="relatedtarget"></td...

HTMLBodyElement - Web APIs
windoweventhandlers.onbeforeprint is an eventhandler representing the code to be called when the beforeprint event is raised.
... windoweventhandlers.onbeforeunload is an eventhandler representing the code to be called when the beforeunload event is raised.
... living standard technically, the event-related properties onafterprint, onbeforeprint, onbeforeunload, onblur, onerror, onfocus, onhashchange, onlanguagechange, onload, onmessage, onoffline, ononline, onpopstate, onresize, onstorage, and onunload, have been moved to windoweventhandlers.
... the following properties have been added: onafterprint, onbeforeprint, onbeforeunload, onblur, onerror, onfocus, onhashchange, onload, onmessage, onoffline, ononline, onpopstate, onresize, onstorage, and onunload.

Ajax navigation example - Web APIs
"</title>"; ?> </head> <body> <?php include "include/before_content.php"; ?> <p>this paragraph is shown only when the navigation starts from <strong>first_page.php</strong>.</p> <div id="ajax-content"> <?php } ?> <p>this is the content of <strong>first_page.php</strong>.</p> <?php if ($as_json) { echo json_encode(array("page" => $page_title, "content" => ob_get_clean())); } else { ?> </div> <p>this paragraph is shown only when the...
..."</title>"; ?> </head> <body> <?php include "include/before_content.php"; ?> <p>this paragraph is shown only when the navigation starts from <strong>second_page.php</strong>.</p> <div id="ajax-content"> <?php } ?> <p>this is the content of <strong>second_page.php</strong>.</p> <?php if ($as_json) { echo json_encode(array("page" => $page_title, "content" => ob_get_clean())); } else { ?> </div> <p>this paragraph is shown only when t...
..."</title>"; ?> </head> <body> <?php include "include/before_content.php"; ?> <p>this paragraph is shown only when the navigation starts from <strong>third_page.php</strong>.</p> <div id="ajax-content"> <?php echo $page_content; ?> </div> <p>this paragraph is shown only when the navigation starts from <strong>third_page.php</strong>.</p> <?php include "include/after_content.php"; echo "</body>\n</html>"; } ?> css/style.css: #aja...
...it is shared between all ajax pages.</p> include/before_content.php: <p> [ <a class="ajax-nav" href="first_page.php">first example</a> | <a class="ajax-nav" href="second_page.php">second example</a> | <a class="ajax-nav" href="third_page.php">third example</a> | <a class="ajax-nav" href="unexisting.php">unexisting page</a> ] </p> include/header.php: <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <script type="text/javascrip...

Basic concepts - Web APIs
in this case the complete event is fired after the os has been told to write the data but potentially before that data has actually been flushed to disk.
... the event may thus be delivered quicker than before, however, there exists a small chance that the entire transaction will be lost if the os crashes or there is a loss of system power before the data is flushed to disk.
...you're storing critical data that cannot be recomputed later) you can force a transaction to flush to disk before delivering the complete event by creating a transaction using the experimental (non-standard) readwriteflush mode (see idbdatabase.transaction.) this is currently experimental, and can only be used if the dom.indexeddb.experimental pref is set to true in about:config.
...the key must be of a data type that has a number that is greater than the one before it.

LocalFileSystem - Web APIs
for example, if you were to create a mail app, you might create a temporary storage for caching assets (like images and attachments) to speed up performance, while creating persistent storage for unique data—such as drafts of emails that were composed while offline—that should not be lost before they are backed up into the cloud.
...persistent storage is storage that stays in the browser unless the app or the user removes it, but the user must grant you permission before you can use it.
...quest storage, you need to do something like the following: var requestedbytes = 1024*1024*10; // 10mb navigator.webkitpersistentstorage.requestquota ( requestedbytes, function(grantedbytes) { window.requestfilesystem(persistent, grantedbytes, oninitfs, errorhandler); }, function(e) { console.log('error', e); } ); your user must grant your app permission to store data locally before your app can use persistent storage.
...the user must grant permission before the app can use this type of storage.

NotificationEvent - Web APIs
or androidopera for androidsafari on iossamsung internetnotificationevent experimentalchrome full support 42edge full support ≤18firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie ?
...l support 4.0notificationevent() constructor experimentalchrome full support 42edge full support ≤18firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie ?
...droid full support 4.0action experimentalchrome full support 48edge full support ≤18firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie ?
... full support 5.0notification experimentalchrome full support 42edge full support ≤18firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie ?

PerformanceEventTiming - Web APIs
auxclick beforeinput click compositionend compositionstart compositionupdate contextmenu dblclick dragend dragenter dragleave dragover dragstart drop input keydown keypress keyup mousedown mouseenter mouseleave mouseout mouseover mouseup pointerover pointerenter pointerdown pointerup pointercancel pointerout pointerleave gotpointercapture lostpointercapture touchstart touchend touchcancel properties performanceeventtiming.processingstart returns the time at which event dispatch started.
... examples the following example shows how to use the api for all events: const observer = new performanceobserver(function(list) { const perfentries = list.getentries().foreach(entry => { // full duration const inputduration = entry.duration; // input delay (before processing event) const inputdelay = entry.processingstart - entry.starttime; // synchronous event processing time (between start and end dispatch).
... // keep track of whether (and when) the page was first hidden, see: // https://github.com/w3c/page-visibility/issues/29 // note: ideally this check would be performed in the document <head> // to avoid cases where the visibility state changes before this code runs.
...entries that occurred before calling `observe()` below.

Range - Web APIs
range.setstartbefore() sets the start position of a range relative to another node.
... range.setendbefore() sets the end position of a range relative to another node.
... range.comparenode() returns a constant representing whether the node is before, after, inside, or surrounding the range.
... range.comparepoint() returns -1, 0, or 1 indicating whether the point occurs before, inside, or after the range.

Resource Timing API - Web APIs
the first property in the processing model is starttime which returns the timestamp immediately before the resource loading process begins.
...the next stages are connectstart and connectend which are the timestamps immediately before and after connecting to the server, respectively.
... the last three timestamps are, in order: requeststart - the timestamp before the browser starts requesting the resource from the server; responsestart - the timestamp after the browser receives the first byte of the response from the server; and responseend - the timestamp after the browser receives the last byte of the resource.
... the encodedbodysize property returns the size (in octets) received from the fetch (http or cache), of the payload body, before removing any applied content-codings.

SVGSVGElement - Web APIs
svgsvgelement.usecurrentview the initial view (i.e., before magnification and panning) of the current innermost svg document fragment can be either the "standard" view, i.e., based on attributes on the <svg> element such as viewbox) or on a "custom" view (i.e., a hyperlink into a particular <view> or other element).
... svgsvgelement.currentview an svgviewspec defining the initial view (i.e., before magnification and panning) of the current innermost svg document fragment.
...if getcurrenttime() is called before the document timeline has begun (for example, by script running in a <script> element before the document's svgload event is dispatched), then 0 is returned.
...if setcurrenttime() is called before the document timeline has begun (for example, by script running in a <script> element before the document's svgload event is dispatched), then the value of seconds in the last invocation of the method gives the time that the document will seek to once the document timeline has begun.

Movement, orientation, and motion: A WebXR example - Web APIs
options this example has a number of options you can configure by adjusting the values of constants before you load it in the browser.
... starting up the webxr session the sessionstarted() function handles actually setting up and starting the session, by setting up event handlers, compiling and installing the glsl code for the vertex and fragment shaders, and attaching the webgl layer to the webxr session before kicking off the rendering loop.
... applying the user inputs the applyviewercontrols() function, which is called by drawframe() before beginning to render anything, takes the offsets in each of the three directions, the yaw offset, and the pitch offset as recorded by the handlekeydown() and handlepointermove() functions in response to the user pressing keys and dragging their mouse with the right mouse button pressed.
... loadshader() creates a shader object and loads the specified source code into it before compiling the code and checking to ensure that the compiler succeeded before returning the newly compiled shader to the caller.

Using the Web Audio API - Web APIs
autoplay policies typically require either explicit permission or a user engagement with the page before scripts can trigger audio to play.
...we have a play button that changes to a pause button when the track is playing: <button data-playing="false" role="switch" aria-checked="false"> <span>play/pause</span> </button> before we can play our track we need to connect our audio graph from the audio source/input node to the destination.
...we'll use the factory method in our code: const gainnode = audiocontext.creategain(); now we have to update our audio graph from before, so the input is connected to the gain, then the gain node is connected to the destination: track.connect(gainnode).connect(audiocontext.destination); this will make our audio graph look like this: the default value for gain is 1; this keeps the current volume the same.
...again let's use a range type input to vary this parameter: <input type="range" id="panner" min="-1" max="1" value="0" step="0.01"> we use the values from that input to adjust our panner values in the same way as we did before: const pannercontrol = document.queryselector('#panner'); pannercontrol.addeventlistener('input', function() { panner.pan.value = this.value; }, false); let's adjust our audio graph again, to connect all the nodes together: track.connect(gainnode).connect(panner).connect(audiocontext.destination); the only thing left to do is give the app a try: check out the final demo here on codepen...

Visualizations with Web Audio API - Web APIs
these methods copy data into a specified array, so you need to create a new array to receive the data before invoking one.
...oscilloscope to create the oscilloscope visualisation (hat tip to soledad penadés for the original code in voice-change-o-matic), we first follow the standard pattern described in the previous section to set up the buffer: analyser.fftsize = 2048; var bufferlength = analyser.frequencybincount; var dataarray = new uint8array(bufferlength); next, we clear the canvas of what had been drawn on it before to get ready for the new visualization display: canvasctx.clearrect(0, 0, width, height); we now define the draw() function: function draw() { in here, we use requestanimationframe() to keep looping the drawing function once it has been started: var drawvisual = requestanimationframe(draw); next, we grab the time domain data and copy it into our array analyser.getbytetimedomaindata(dataarr...
...the only difference from before is that we have set the fft size to be much smaller; this is so that each bar in the graph is big enough to actually look like a bar rather than a thin strand.
... var barwidth = (width / bufferlength) * 2.5; var barheight; var x = 0; as before, we now start a for loop and cycle through each value in the dataarray.

Using Web Workers - Web APIs
function declarations after the importscripts() method are also kept, since these are always evaluated before the rest of the code.
... the port connection needs to be started either implicitly by use of the onmessage event handler or explicitly with the start() method before any messages can be posted.
... sending messages to and from a shared worker now messages can be sent to the worker as before, but the postmessage() method has to be invoked through the port object (again, you'll see similar constructs in both multiply.js and square.js): squarenumber.onchange = function() { myworker.port.postmessage([squarenumber.value,squarenumber.value]); console.log('message posted to worker'); } now, on to the worker.
... example.html: (the main page): var myworker = new worker('my_task.js'); myworker.onmessage = function(oevent) { console.log('worker said : ' + oevent.data); }; myworker.postmessage('ali'); my_task.js (the worker): postmessage("i\'m working before postmessage(\'ali\')."); onmessage = function(oevent) { postmessage('hi ' + oevent.data); }; the structured cloning algorithm can accept json and a few things that json can't — like circular references.

Window.open() - Web APIs
in addition to the toolbar buttons, firefox (before 76) will render the tab bar if it is visible, present in the parent window.
...therefore, before executing a script targeting a secondary window, the browser in the main window will verify that the secondary window has the same domain name.
...opening new browser windows, jakob nielsen, may 1999 when extreme changes in context are explicitly identified before they occur, then the users can determine if they wish to proceed or so they can be prepared for the change: not only they will not be confused or feel disoriented, but more experienced users can better decide how to open such links (in a new window or not, in the same window, in a new tab or not, in "background" or not).
...references "if your link spawns a new window, or causes another windows to 'pop up' on your display, or move the focus of the system to a new frame or window, then the nice thing to do is to tell the user that something like that will happen." world wide web consortium accessibility initiative regarding popups "use link titles to provide users with a preview of where each link will take them, before they have clicked on it." ten good deeds in web design, jakob nielsen, october 1999 using link titles to help users predict where they are going, jakob nielsen, january 1998 example "new window" icons & cursors always use the target attribute if javascript support is disabled or non-existent, then ...

Window.requestAnimationFrame() - Web APIs
the window.requestanimationframe() method tells the browser that you wish to perform an animation and requests that the browser calls a specified function to update an animation before the next repaint.
... the method takes a callback as an argument to be invoked before the repaint.
...this will request that your animation function be called before the browser performs the next repaint.
... element.style.transform = 'translatex(' + math.min(0.1 * elapsed, 200) + 'px)'; if (elapsed < 2000) { // stop the animation after 2 seconds window.requestanimationframe(step); } } window.requestanimationframe(step); notes edge versions below 17 and internet explorer do not reliably fire requestanimationframe before the paint cycle.

WindowOrWorkerGlobalScope.queueMicrotask() - Web APIs
the microtask is a short function which will run after the current task has completed its work and when there is no other code waiting to be run before control of the execution context is returned to the browser's event loop.
... this lets your code run without interfering with any other, potentially higher priority, code that is pending, but before the browser regains control over the execution context, potentially depending on work you need to complete.
... microtasks are especially useful for libraries and frameworks that need to perform final cleanup or other just-before-rendering tasks.
...enqueued microtasks are executed after all pending tasks have completed but before yielding control to the browser's event loop.

ARIA: listbox role - Accessibility
(for further details and a full list of aria states and properties see the aria listbox (role) documentation.) keyboard interactions when a single-select listbox receives focus: if none of the options are selected before the listbox receives focus, the first option receives focus.
... if an option is selected before the listbox receives focus, focus is set on the selected option.
... when a multi-select listbox receives focus: if none of the options are selected before the listbox receives focus, focus is set on the first option and there is no automatic change in the selection state.
... if one or more options are selected before the listbox receives focus, focus is set on the first option in the list that is selected.

CSS reference - CSS: Cascading Style Sheets
elayanimation-directionanimation-durationanimation-fill-modeanimation-iteration-countanimation-nameanimation-play-stateanimation-timing-function@annotationannotation()attr()b::backdropbackdrop-filterbackface-visibilitybackgroundbackground-attachmentbackground-blend-modebackground-clipbackground-colorbackground-imagebackground-originbackground-positionbackground-repeatbackground-size<basic-shape>::before (:before)bleed (@page)<blend-mode>block-sizeblur()borderborder-blockborder-block-colorborder-block-endborder-block-end-colorborder-block-end-styleborder-block-end-widthborder-block-startborder-block-start-colorborder-block-start-styleborder-block-start-widthborder-block-styleborder-block-widthborder-bottomborder-bottom-colorborder-bottom-left-radiusborder-bottom-right-radiusborder-bottom-stylebor...
...leftborder-left-colorborder-left-styleborder-left-widthborder-radiusborder-rightborder-right-colorborder-right-styleborder-right-widthborder-spacingborder-start-end-radiusborder-start-start-radiusborder-styleborder-topborder-top-colorborder-top-left-radiusborder-top-right-radiusborder-top-styleborder-top-widthborder-widthbottom@bottom-centerbox-decoration-breakbox-shadowbox-sizingbreak-afterbreak-beforebreak-insidebrightness()ccalc()caption-sidecaret-colorch@character-variantcharacter-variant()@charset:checkedcircle()clamp()clearclipclip-pathcm<color>colorcolor-adjustcolumn-countcolumn-fillcolumn-gapcolumn-rulecolumn-rule-colorcolumn-rule-stylecolumn-rule-widthcolumn-spancolumn-widthcolumnsconic-gradient()containcontentcontrast()<counter>counter-incrementcounter-resetcounter-set@counter-stylecou...
...overflow-anchoroverflow-blockoverflow-inlineoverflow-wrapoverflow-xoverflow-yoverscroll-behavioroverscroll-behavior-blockoverscroll-behavior-inlineoverscroll-behavior-xoverscroll-behavior-yppad (@counter-style)paddingpadding-blockpadding-block-endpadding-block-startpadding-bottompadding-inlinepadding-inline-endpadding-inline-startpadding-leftpadding-rightpadding-top@pagepage-break-afterpage-break-beforepage-break-insidepaint()paint-orderpath()pc<percentage>perspectiveperspective()perspective-originplace-contentplace-itemsplace-self::placeholderpointer-eventspolygon()<position>positionprefix (@counter-style)ptpxqqquotesrradradial-gradient()range (@counter-style)<ratio>:read-only:read-writerect()remrepeat()repeating-linear-gradient()repeating-radial-gradient():requiredresize<resolution>revertrgb()...
... general sibling combinator a ~ b specifies that the elements selected by both a and b share the same parent and that the element selected by a comes before—but not necessarily immediately before—the element selected by b.

position - CSS: Cascading Style Sheets
xploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetpositionchrome full support 1edge full support 12firefox full support 1notes full support 1notes notes before firefox 57, absolute positioning did not work correctly when applied to elements inside tables that have border-collapse applied to them (bug 1379306).notes before firefox 30, absolute positioning of table rows and row groups was not supported (bug 63895).ie full support 4opera full support 4safari ...
... full support 1webview android full support ≤37chrome android full support 18firefox android full support 4notes full support 4notes notes before firefox 57, absolute positioning did not work correctly when applied to elements inside tables that have border-collapse applied to them (bug 1379306).notes before firefox 30, absolute positioning of table rows and row groups was not supported (bug 63895).opera android full support 14safari ios full support 1samsung internet android f...
...t 11samsung internet android full support 6.0fixedchrome full support 1edge full support 12firefox full support 1notes full support 1notes notes before firefox 44, position: fixed didn't create a stacking context in most cases.
... 4safari full support 1webview android full support ≤37chrome android full support 18firefox android full support 4notes full support 4notes notes before firefox 44, position: fixed didn't create a stacking context in most cases.

will-change - CSS: Cascading Style Sheets
browsers may set up optimizations before an element is actually changed.
... these kinds of optimizations can increase the responsiveness of a page by doing potentially expensive work before they are actually required.
...so it is a good practice to switch will-change on and off using script code before and after the change occurs.
...then the browser can choose to apply any ahead-of-time optimizations required for the property change before the property change actually happens.

<input type="tel"> - HTML: Hypertext Markup Language
unlike <input type="email"> and <input type="url"> , the input value is not automatically validated to a particular format before the form can be submitted, because formats for telephone numbers vary so much around the world.
... here's a screenshot of what that might look like: validation as we've touched on before, it's quite difficult to provide a one-size-fits-all client-side validation solution for phone numbers.
... important: html form validation is not a substitute for server-side scripts that ensure the entered data is in the proper format before it is allowed into the database.
... in this example we'll use the same css as before, but our html is changed to look like this: <form> <div> <label for="telno">enter a telephone number (in the form xxx-xxx-xxxx): </label> <input id="telno" name="telno" type="tel" required pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}"> <span class="validity"></span> </div> <div> <button>submit</button> </div> </form> div { margin-bottom: 10px; position: relative; ...

<input>: The Input (Form Input) element - HTML: Hypertext Markup Language
note: an element with the autofocus attribute may gain focus before the domcontentloaded event is fired.
...when autofocus is assigned, screen-readers "teleport" their user to the form control without warning them beforehand.
...while a screen reader will announce the label of the form control receiving focus, the screen reader will not announce anything before the label, and the sighted user on a small device will equally miss the context created by the preceding content.
... required required is a boolean attribute which, if present, indicates that the user must specify a value for the input before the owning form can be submitted.

<script>: The Script element - HTML: Hypertext Markup Language
this attribute allows the elimination of parser-blocking javascript where the browser would have to load and evaluate scripts before continuing to parse.
... defer this boolean attribute is set to indicate to a browser that the script is meant to be executed after the document has been parsed, but before firing domcontentloaded.
... this attribute allows the elimination of parser-blocking javascript where the browser would have to load and evaluate scripts before continuing to parse.
... notes scripts without async , defer or type="module" attributes, as well as inline scripts, are fetched and executed immediately, before the browser continues to parse the page.

A re-introduction to JavaScript (JS tutorial) - JavaScript
this is useful for checking for null objects before accessing their attributes: var name = o && o.getname(); or for caching values (when falsy values are invalid): var name = cachedname || (cachedname = getname()); javascript has a ternary operator for conditional expressions: var allowed = (age > 18) ?
... it is important to note that wherever the rest parameter operator is placed in a function declaration it will store all arguments after its declaration, but not before.
... 'this can now be reversed'.reversed(); // desrever eb won nac siht as mentioned before, the prototype forms part of a chain.
...we've seen this once before, with an earlier makeperson() function.

Array.prototype.forEach() - JavaScript
the range of elements processed by foreach() is set before the first invocation of callback.
...if existing elements of the array are changed or deleted, their value as passed to callback will be the value at the time foreach() visits them; elements that are deleted before being visited are not visited.
... converting a for loop to foreach const items = ['item1', 'item2', 'item3'] const copyitems = [] // before for (let i = 0; i < items.length; i++) { copyitems.push(items[i]) } // after items.foreach(function(item){ copyitems.push(item) }) printing the contents of an array note: in order to display the content of an array in the console, you can use console.table(), which prints a formatted version of the array.
... foreach() does not make a copy of the array before iterating.

Object.create() - JavaScript
adding the missing object-method directly from the standard-object does not work: ocn = object.create( null ); // create "null" object (same as before) ocn.tostring = object.tostring; // since new object lacks method then try assigning it directly from standard-object > ocn.tostring // shows "tostring() { [native code] }" -- missing method seems to be there now > ocn.tostring == object.tostring // shows "true" -- method seems to be same as the standard object-method > ocn.tostring() // error: function.prototype.tostring requires that 'this' ...
...be a function adding the missing object-method directly to new object's "prototype" does not work either, since the new object does not have a real prototype (which is really the cause of all these problems) and one cannot be directly added: ocn = object.create( null ); // create "null" object (same as before) ocn.prototype.tostring = object.tostring; // error: cannot set property 'tostring' of undefined ocn.prototype = {}; // try to create a prototype ocn.prototype.tostring = object.tostring; // since new object lacks method then try assigning it from standard-object > ocn.tostring() // error: ocn.tostring is not a function adding the missing object-method by using the standard-object as new object's prototype does not work either: ocn = object.create( null ...
...); // create "null" object (same as before) object.setprototypeof(ocn, object); // set new object's prototype to the standard-object > ocn.tostring() // error: function.prototype.tostring requires that 'this' be a function some ok solutions again, adding the missing object-method directly from the standard-object does not work.
... however, adding the generic method directly, does: ocn = object.create( null ); // create "null" object (same as before) ocn.tostring = tostring; // since new object lacks method then assign it directly from generic version > ocn.tostring() // shows "[object object]" > "ocn is: " + ocn // shows "ocn is: [object object]" ob={}; ob.pn=ocn; ob.po=oco; // create a compound object (same as before) > showproperties(ob) // display top-level properties - po: [object object] - pn: [object object] however, setting the generic prototype as the new object's prototype works even better: ocn = object.create( null ); // create "null" object (same as before) object.setprototypeof(ocn, object.prototype); // set new object's prototype to the "generic" object (not standard-object) (in ...

Digital audio concepts - Web media technologies
high-resolution (96 khz) audio is used in some high-end audio systems, and it and ultra-high resolution (192 khz) audio are useful for audio mastering, where you need as much quality as possible while manipulating and editing the sound before downsampling to the sample rate you will use for the final product.
... this is similar to how photographers will use high resolution images for editing and compositing before presenting the customer with a jpeg suitable for use on a web site.
... all of this means there is a fundamental question that has to be asked and answered before choosing a codec: given the content of the sound, the usage context, and the target audience, is it acceptable to lose some degree of audio fidelity, and if so, how much; or is it necessary that, upon decoding the data, the result be identical to the source audio?
...a sound coming from our right will arrive at our right ear before it arrives at our left ear.

Codecs used by WebRTC - Web media technologies
general codec requirements before looking at codec-specific capabilities and requirements, there are a few overall requirements that must be met by any codec configuration used with webrtc.
... preferred codecs for webrtc in major web browsers audio video chrome edge firefox vp9 (firefox 46 and later) vp8 opera safari choosing the right codec before choosing a codec that isn't one of the mandatory codecs (vp8 or avc for video and opus or pcm for audio), you should seriously consider the potential drawbacks: in particular, only these codecs can be generally assumed to be available on essentially all devices that support webrtc.
... licensing terms before choosing a video codec, make sure you're aware of any licensing requirements around the codec you select; you can find information about possible licensing concerns in our main guide to video codecs used on the web.
...be sure to confirm your exposure to liability before making any final decisions where potential exists for licensing issues.

Mobile first - Progressive web apps (PWAs)
in our planning your app article, we provided a high level look into the kinds of planning and functionality decisions you should make before you start coding an app, including some ideas for desktop and mobile design.
... first things first — mobile as a default you may think that concentrating on the mobile experience first sounds pointless, as we are more used to dealing with desktop sites, and we surely need to consider the full gamut of features for the overall experience across desktop, mobile, etc., before then paring it down to a mobile experience that is simpler, more streamlined, or whatever.
...then at implementation stage, we present the mobile layout and functionality as the default configuration provided, before additional information is loaded on top of that, whenever appropriate.
...for example: if you are serving different styling and layout information for different viewport sizes, etc., it makes more sense to include the narrow screen/mobile styling as the default styling before any media queries are encountered, rather than having desktop/wider screen styling first.

The building blocks of responsive design - Progressive web apps (PWAs)
border-box sizing the padding does not affect the overall width and height of the containers because we have set the box-sizing of all elements to border-box: *, *:before, *:after { -webkit-box-sizing: border-box; -moz-box-sizing: border-box; box-sizing: border-box; } this basically means that width and height will now set the dimensions of an element all the way up to and including the border, not just the content.
...this is created using the css rules included at the top of the stylesheet, before any media queries are encountered.
...if you use the mobile first methodology, you will be creating your mobile layout inside your default css, before any media queries have been applied.
... mobify.js capturing a very clever technique from mozilla that allows you to capture the source of the page before it's parsed.

page-mod - Archive of obsolete content
var data = require("sdk/self").data; var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*", contentscriptfile: [data.url("jquery.min.js"), data.url("my-script.js")] }); content scripts specified using this option are loaded before those specified by the contentscript option.
... the option takes a single string that may take any one of the following values: "start": load content scripts immediately after the document element is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) has been loaded, at the time the window.onload event fires var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*", contentscript: 'window.alert("...
...so you can rewrite the code above like this: var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*.org", contentstylefile: "./style.css" }); content styles specified by this option are loaded before those specified by the contentstyle option.

page-worker - Archive of obsolete content
content scripts specified by this option are loaded before those specified by the contentscript option.
...this may take one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires this property is optional and defaults to "end".
...this may have one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.

/loader - Archive of obsolete content
all other modules will be loaded by this module or its dependencies: let { main, loader } = require('toolkit/loader'); let loader = loader(options); let program = main(loader, './main'); a module can find out whether it was loaded as main: if (require.main === module) main(); it is possible to load other modules before a main one, but it's inherently harder to do.
...in order to load a module before a main one (for example to bootstrap an environment) the requirer must be created first: let { require, loader, module } = require('toolkit/loader'); let loader = loader(options); let requirer = module(requirerid, requireruri); let require = require(loader, requirer); let boostrap = require(bootstrapid); built-in modules each loader instance exposes the following built-in pseudo modules in addition to those passed via modules: chrome this pseudo module exposes everything that is typically available for js contexts with system principals under the components global.
...but sometimes you may want to prepare the environment using existing modules before doing that.

content/symbiont - Archive of obsolete content
this may take one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires this property is optional and defaults to "end".
...content scripts specified by this property are loaded before those specified by the contentscript property.
...this may have one of the following values: "start": load content scripts immediately after the document element for the page is inserted into the dom, but before the dom content itself has been loaded "ready": load content scripts once dom content has been loaded, corresponding to the domcontentloaded event "end": load content scripts once all the content (dom, js, css, images) for the page has been loaded, at the time the window.onload event fires contentscriptoptions read-only value exposed to content scripts under self.options property.

Bootstrapped extensions - Archive of obsolete content
this feature was unavailable in firefox versions before 8.
... install your bootstrap script must include an install() function, which the application calls before the first call to startup() after the extension is installed, upgraded, or downgraded.
... uninstall this function is called after the last call to shutdown() before a particular version of an extension is uninstalled.

Miscellaneous - Archive of obsolete content
alse); } } function onfocusinput(focusevent) { focusedcontrol = focusevent.originaltarget; } function onblurinput(blurevent) { focusedcontrol = null; } or var element = document.commanddispatcher.focusedelement; inserting text at the cursor function inserttext(element, snippet) { var selectionend = element.selectionstart + snippet.length; var currentvalue = element.value; var beforetext = currentvalue.substring(0, element.selectionstart); var aftertext = currentvalue.substring(element.selectionend, currentvalue.length); element.value = beforetext + snippet + aftertext; element.focus(); //put the cursor after the inserted text element.setselectionrange(selectionend, selectionend); } inserttext(document.getelementbyid("example"), "the text to be inserted"); disa...
...reateinstance(ci.nsibinaryinputstream); stream.setinputstream(postdata); var postbytes = stream.readbytearray(stream.available()); var poststr = string.fromcharcode.apply(null, postbytes); //do anything to your poststr alert(poststr); getting a string from the input stream is made somewhat simpler in firefox 4, by the addition of netutil.readinputstreamtostring() getting postdata of a request before the request is sent the above code will get the postdata for a page that has already loaded.
... to see what the postdata looks like before the request is even sent, use the 'http-on-modify-request' observer topic: observerservice.addobserver(observer, 'http-on-modify-request', false); where "observer" is an object that has a method "observe": function observe(subject, topic, data) { subject.queryinterface(components.interfaces.nsiuploadchannel); postdata = subject.uploadstream; } here again, postdata is not a string, but an nsiinputstream, so you can use the last code snippet of the previous section to get the data as a string.

Enhanced Extension Installation - Archive of obsolete content
if the item is found incompatible, a version update check is performed as before.
... finalization on the next startup, the startup system discovers the .autoreg file (as before) and starts the extension system with the dirty flag, which causes the system to scan for items to be installed as before.
...the startup process discovered the .autoreg file, before pending operations are finalized the extension system reads the extensions-startup.manifest and scans all of the install locations looking for items that match the following criteria: item in install location is not listed in startup manifest (new item being installed by just appearing in the install location).

Extension Versioning, Update and Compatibility - Archive of obsolete content
as a rough overview this is a version string split by periods, some examples: 2.0 1.0b1 3.0pre1 5.0.1.2 note: before firefox 1.5 the more basic firefox version format was used: major.minor.release.build[+] where only digits were allowed.
... note: before firefox 1.5 the preference app.extensions.version could be used to override the version that the application believed itself to be to allow normally incompatible extensions to install.
... the technical details of the signing mechanism are beyond the scope of this document however the basics are as follows: step 1 - done once, before you publish your add-on the target: adding updatekey in install.rdf the add-on author creates a public/private rsa cryptographic key pair.

Listening to events in Firefox extensions - Archive of obsolete content
if a page uses an unload or beforeunload handler, it fires when the user navigates away from the page.
...if the page contains frames, then when the cached page is loaded: pageshow events from each frame fire before the pageshow event in the main document fires.
... when the user navigates away from the cached page, the pagehide event from each frame fires before the pagehide event in the main document.

Appendix A: Add-on Performance - Archive of obsolete content
the problem with the onload event is that it runs before the main window becomes visible, so all handlers need to complete before the user can see the window.
... luckily, minimizing your startup time is easy, if you follow these guidelines: do not load or run code before it’s needed.
...if there's anything you can unload before shutdown, or if there's anything you can do to unload things more efficiently, then it's important that you do.

User Notifications and Alerts - Archive of obsolete content
they interrupt the user's workflow, demanding immediate action before anything else can be done.
... the notificationbox element you have probably seen these before.
... an easy way to display alerts is to include a hidden box in your overlay, which you can fill with any content you need before removing the hidden attribute so that it is displayed to the user.

Setting up an extension development environment - Archive of obsolete content
(note that the extension manager automatically restarts the application at startup sometimes, which may mean you won't have time to see the messages logged before the automatic restart happens.
... to see them, prevent the automatic restart by setting the environment no_em_restart to 1 before starting the application.) nglayout.debug.disable_xul_fastload = true.
... note: if you already installed the extension via xpi, you should uninstall it first before creating the pointer file.

Exception logging in JavaScript - Archive of obsolete content
as a result, if, for example, c++ code called a javascript component, which threw an exception, that exception would be logged to the console before control was returned to the c++ caller.
...if the javascript in frame 2 either receives an exception from frame 3 or generates its own exception, and that exception remains unandled, then the exception will always be logged to the error console before control returns to the c++ in frame 1.
... in other words, all unhandled javascript exceptions (except those in rules 3 and 4 above) will be logged before control returns to the outermost c++ caller.

Style System Overview - Archive of obsolete content
mapruleinfointo implementations must check that the property is not filled in before filling it in.
... managing style contexts style contexts must (in most cases) be created before frames are constructed, to determine what frame to create.
... resolvepseudostylecontextfor: for pseudo-elements (:first-letter, :before, etc.) resolvestylecontextfornonelement: skips rule matching and uses root rule node (text frame optimization) managing style contexts style context resolving functions will walk the rule processors in stylesetimpl::filerules, find the correct rule node, and find a current child of the parent (“sibling sharing”) or create a new child.

JavaScript Client API - Archive of obsolete content
before starting before you start learning the javascript api, you should spend some time on http://docs.services.mozilla.com/ reading about how the sync service operates.
...before developing against the javascript api, it is recommended to speak to developers of the api.
...reason for this is, weave will iterate through the registerengines preference and try to instantiate each engine it has there before you the line mentioned above ever has a chance to execute.this means the constructor to your engine is not ready when weave tries to instantiate it.

Simple Storage - Archive of obsolete content
the namespace currently lives in the future and must be imported before it is used: jetpack.future.import("storage.simple"); methods sync()as described above, the jetpack.storage.simple object is automatically written to disk, but a feature may force flush by calling jetpack.storage.simple.sync().
... notes : [{ label: "(empty)", disabled: true }]) });}// modify the page's context menu by sneaking in before it's shown.
...:(jetpack.menu.context.page.beforeshow = function (menu) { menu.reset(); if (jetpack.selection.text) menu.add({ label: "note", command: function () { notes.unshift(jetpack.selection.text); if (notes.length > 20) notes.pop(); updatejetpackmenu(); } });};// initialize the jetpack menu with the current notes.updatejetpackmenu(); see also settings jep 11 ...

Simple Storage - Archive of obsolete content
the namespace currently lives in the future and must be imported before it is used: jetpack.future.import("storage.simple"); methods sync()as described above, the jetpack.storage.simple object is automatically written to disk, but a feature may force flush by calling jetpack.storage.simple.sync().
... notes : [{ label: "(empty)", disabled: true }]) }); } // modify the page's context menu by sneaking in before it's shown.
...:( jetpack.menu.context.page.beforeshow = function (menu) { menu.reset(); if (jetpack.selection.text) menu.add({ label: "note", command: function () { notes.unshift(jetpack.selection.text); if (notes.length > 20) notes.pop(); updatejetpackmenu(); } }); }; // initialize the jetpack menu with the current notes.

Scripting - Archive of obsolete content
it can contain the following functions: startup when the app starts, before the user interface is displayed.
...preload just before the user interface is displayed.
...shutdown just before the application terminates.

Frequently Asked Questions - Archive of obsolete content
the native svg support must be turned off before mozilla will look to see if there's an svg plugin installed.
...tim is working on implementing <filter> and working on items that need to be done before turning on svg by default.
...jonathan is working on various bugs, especially those that need to be fixed before svg can be enabled in the official builds.

Space Manager Detailed Design - Archive of obsolete content
ft, nscoord atop, nscoord aright, nscoord abottom, nsiframe*); bandrect(nscoord aleft, nscoord atop, nscoord aright, nscoord abottom, nsvoidarray*); ~bandrect(); // list operations bandrect* next() const {return (bandrect*)pr_next_link(this);} bandrect* prev() const {return (bandrect*)pr_prev_link(this);} void insertbefore(bandrect* abandrect) {pr_insert_before(abandrect, this);} void insertafter(bandrect* abandrect) {pr_insert_after(abandrect, this);} void remove() {pr_remove_link(this);} // split the band rect into two vertically, with this band rect becoming // the top part, and a new band rect being allocated and returned for the // bottom part // // does not insert the ne...
... starting at the head of the list of bandrects, check for intersection with the rect passed in: case #1: the rect is totally above the current band rect, so insert a new band rect before the current bandrect cases #2 and #7: the rect is partially above the band rect, so it is divided into two bandrects, one entirely above the band, and one containing the remainder of the rect.
... insert the part that is totally above the bandrect before the current bandrect, as in case #1 above, and adjust the other band rect to exclude the part already added.

Elements - Archive of obsolete content
the part before the colon is a namespace prefix so you must declare the xul namespace as well.
... a field no longer changes the value of a property set on the object itself (rather than a proto) before binding attachment.
... any - this causes the filter to ignore the state of any modifiers that occur before the any keword.

Windows Install - Archive of obsolete content
note the disk space verification, the editing of the windows registry, the writing to the installation log, and the error checking before either performinstall or cancelinstall is called.
... spacerequired) { logcomment("insufficient disk space: " + dirpath); logcomment(" required : " + spacerequired + " k"); logcomment(" available: " + spaceavailable + " k"); return(false); } return(true); } function updatewinreg4ren8dot3() { var fprogram = getfolder("program"); var ftemp = getfolder("temporary"); //notes: // can't use a double backslash before subkey // - windows already puts it in.
... // subkeys have to exist before values can be put in.

execute - Archive of obsolete content
blocking a boolean value that specifies whether the installation should wait for the execution of the file to finish before it resumes.
...the blocking parameter is not available as part of this method in versions of netscape before 6.1/mozilla 0.9.3.
...the optional blocking argument, when set to true, specifies that the installation should wait for this executable to finish before processing the next queued install command.

timeout - Archive of obsolete content
« xul reference home timeout type: integer for autocomplete textboxes, the number of milliseconds before the textbox starts searching for completions.
...for search textboxes, the number of milliseconds before the timer fires a command event.
...for timed textboxes, the number of milliseconds before the timer fires a command event.

XUL Events - Archive of obsolete content
attribute: onpopuphiding popupshowing this event is sent to a popup just before it is popped open.
...for user changes, the checkboxstatechange event is sent before the command event.
...for user changes, the radiostatechange event is sent before the command event.

Special per-platform menu considerations - Archive of obsolete content
menu_filequitseparator the separator just before the quit/exit item.
... menu_prefsseparator the separator just before the preferences/options item.
... aboutseparator the separator just before the about item.

Multiple Queries - Archive of obsolete content
here are the results that would be generated by the first query above, before any bindings are applied: (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/canal.jpg, then, the builder adds the three results generated from the second query: (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xulplanet.com/ndeakin/images/t/canal.jpg) (?start = http://www.xulplanet.com/rdf/myphotos, ?photo = http://www.xu...
...the template builder removes any duplicate items before generating content.
...the builder hasn't put all the matches for the first query before the matches for the second query.

XUL accessibility guidelines - Archive of obsolete content
to prevent this, move the focus to the next element before disabling, hiding, or destroying the focus element.
... the following example shows a javascript function that can be called before destroying an element to check for focus and move it if necessary.
...if flickering or flashing is necessary then warn the user before it is displayed.

XUL Event Propagation - Archive of obsolete content
very often, the event raised by the element is heard by the element itself and handled right there before it bubbles up any higher.
...where event bubbling propagates an event from its target up higher into the node hiearchy, event capturing intercepts an event before it is received by other elements, even by the event target itself.
...any node above the event-raising element in the node hierarchy), you can use event capturing to handle the event in the ancestor before it is heard in the target itself or any of the intervening nodes.

iframe - Archive of obsolete content
warning: the type attribute must be set before the element is inserted into the document.
...this can be used to workaround things like bug 540911 inherited from xul element align, allowevents, allownegativeassertions, class, coalesceduplicatearcs, collapsed, container, containment, context, contextmenu, datasources, dir, empty, equalsize, flags, flex, height, hidden, id, insertafter, insertbefore, left, maxheight, maxwidth, menu, minheight, minwidth, mousethrough, observes, ordinal, orient, pack, persist, popup, position, preference-editable, querytype, ref, removeelement, sortdirection, sortresource, sortresource2, statustext, style, template, tooltip, tooltiptext, top, uri, wait-cursor, width properties accessibletype type: integer a value indicating the ty...
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata related nsiaccessibleprovider ...

progressmeter - Archive of obsolete content
this is used when the length of time to complete an operation is not known beforehand.
... inherited from xul element align, allowevents, allownegativeassertions, class, coalesceduplicatearcs, collapsed, container, containment, context, contextmenu, datasources, dir, empty, equalsize, flags, flex, height, hidden, id, insertafter, insertbefore, left, maxheight, maxwidth, menu, minheight, minwidth, mousethrough, observes, ordinal, orient, pack, persist, popup, position, preference-editable, querytype, ref, removeelement, sortdirection, sortresource, sortresource2, statustext, style, template, tooltip, tooltiptext, top, uri, wait-cursor, width properties accessibletype type: integer a value indicating the ty...
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata related interfaces nsiaccessibleprov...

tab - Archive of obsolete content
attributes accesskey, afterselected, beforeselected, command, crop, disabled, first-tab, image, label, last-tab, linkedpanel, oncommand, pending, pinned, selected, tabindex, unread, validate, value properties accesskey, accessibletype, command, control, crop, disabled, image, label, linkedpanel, selected, tabindex, value examples (example needed) attributes accesskey type: character this should be set to a character that is used as a shortcut key.
... beforeselected type: boolean this is set to true if the tab is immediately before the currently selected tab.
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata notes note: prior to gecko 1.9, disabl...

where - Archive of obsolete content
less the numeric value of the subject must be less than the value greater the numeric value of the subject must be greater than the value before the string value of subject must come before value alphabetically after the string value of subject must come after value alphabetically startswith the value of subject must start with the value endswith the value of subject must end with the value contains the value of subject must contain the value as a substring subject type: string the variable or string to comp...
... inherited from xul element align, allowevents, allownegativeassertions, class, coalesceduplicatearcs, collapsed, container, containment, context, contextmenu, datasources, dir, empty, equalsize, flags, flex, height, hidden, id, insertafter, insertbefore, left, maxheight, maxwidth, menu, minheight, minwidth, mousethrough, observes, ordinal, orient, pack, persist, popup, position, preference-editable, querytype, ref, removeelement, sortdirection, sortresource, sortresource2, statustext, style, template, tooltip, tooltiptext, top, uri, wait-cursor, width properties inherited properties align, , allowevents, , boxobject, builder, , , , classname, , , , , collapsed, contextmenu, controllers, database, datasources, dir, , , flex,...
...aredocumentposition, dispatchevent(), docommand, focus, getattribute(), getattributenode(), getattributenodens(), getattributens(), getboundingclientrect(), getclientrects(), getelementsbyattribute, getelementsbyattributens, getelementsbyclassname(), getelementsbytagname(), getelementsbytagnamens(), getfeature, getuserdata, hasattribute(), hasattributens(), hasattributes(), haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata ...

Getting started with XULRunner - Archive of obsolete content
here is mine: pref("toolkit.defaultchromeuri", "chrome://myapp/content/main.xul"); /* debugging prefs, disable these before you deploy your application!
... mac on the mac, before you can run a xulrunner application with everything intact, you must install it using the --install-app xulrunner commandline flag.
...before you get too far into things you might want to read the xulrunner tips article.

Mozilla release FAQ - Archive of obsolete content
if you're new to the mozilla newsgroups, you probably should be reading the newsgroup for a few days regularly before you post anything.
...for example, if you were to make a proposal to compress whole webpages before sending them, devise a new protocol to do so, research how http works, how html works, and think about all the good *and* bad points of reworking things.
...i would suggest that before you devote much time and effort to your port, you consider: how many users the os has that are likely to use mozilla does the os support multitasking well enough for mozilla does the os have a sufficiently evolved gui for mozilla to work does the os have sufficient networking support for mozilla is the os typically run on systems that have the resources to run mozilla does gcc or som...

Introduction to SSL - Archive of obsolete content
before continuing with the session, red hat servers can be configured to check that the client's certificate is present in the user's entry in an ldap directory.
...it is the client's responsibility to take step 4 before step 5.
...red hat servers may optionally be configured to perform step 5 before step 6.

-ms-hyphenate-limit-chars - Archive of obsolete content
if the word does not meet the required minimum number of characters in the word, before the hyphen, or after the hyphen, then the word is not hyphenated.
... initial valueautoapplies toall elementsinheritedyescomputed valueas specifiedanimation typediscrete syntax values auto corresponds to a value of 5 2 2, indicating a 5-character word limit, 2 characters required before a hyphenation break, and 2 characters required following a hyphenation break.
... <integer>{1,3} one to three integer values, corresponding to the word limit, the minimum number of characters required before a hyphenation break, and the minimum number of characters required following a hyphenation break, respectively.

Examples - Archive of obsolete content
</p> <p> <a href="http://validator.w3.org/check/referer"><img src="https://udn.realityripple.com/samples/8a/9e64asf935.png" alt="valid xhtml 1.0!" height="31" width="88" /></a> </p> </body> </html> before testing this example by yourself, please read this.
... </p> <p> <a href="http://validator.w3.org/check/referer"><img src="https://udn.realityripple.com/samples/8a/9e64asf935.png" alt="valid xhtml 1.0!" height="31" width="88" /></a> </p> </body> </html> before testing this example by yourself, please read this.
... </p> <p> <a href="http://validator.w3.org/check/referer"><img src="https://udn.realityripple.com/samples/8a/9e64asf935.png" alt="valid xhtml 1.0!" height="31" width="88" /></a> </p> </body> </html> before testing this example by yourself, please read this.

Back to the Server: Server-Side JavaScript On The Rise - Archive of obsolete content
and just like before, it's the mozilla team that's at the core of this latest evolution of the web.
...this gives you added control to interrogate and manage the document structure before it's pushed to the client.
... listing 7 - manipulating the dom server-side <script runat="server"> window.onserverload = function() { document.getelementbyid( "out-logger" ).innerhtml = jaxer.file.read( "dump.txt" ); } </script> the code in listing 7 is executed server-side and takes advantage of the onserverload event which ensures that we have a complete dom before trying to access it.

Writing JavaScript for XHTML - Archive of obsolete content
before processing the file, all comments will be stripped from the document, so enclosing your script in them is like throwing your lunch in a piranha pool.
...for name comparisons, first convert to lower case before doing the comparison (e.g., "el.nodename.tolowercase() === 'html'").
...now you can't do this as easily as before.

Building Mozilla XForms - Archive of obsolete content
before you can start building the xforms extension, you should check your mozilla build environment by doing a regular firefox build.
...for xforms, you will need to add the following line: ac_add_options --enable-extensions="default,xforms" # if you're using a mozilla source before 2010-11-06 (e.g.
...$topsrcdir/browser/config/mozconfig mk_add_options moz_co_project=browser mk_add_options moz_objdir=@topsrcdir@/obj-@config_guess@ ac_add_options --enable-extensions="default,xforms" ac_add_options --enable-debug ac_add_options --disable-optimize ac_add_options --disable-tests building now that you have everything ready, you can rebuild mozilla with the same command you used before to build firefox without xforms.

Mozilla's DOCTYPE sniffing - Archive of obsolete content
almost standards mode was created after 1.0 and 1.1alpha, but before 1.0.1 and 1.1beta.
... before almost standards mode was created these doctypes triggered full standards mode.
... the system identifier "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd" (before 1.5b and 1.4.2, this triggered almost standards mode).

Bounding volume collision detection with THREE.js - Game development
it is assumed that before reading this you have read our 3d collision detection introductory article first, and have basic knowledge about three.js.
...keep in mind that in order for this property to be defined, you need to manually call geometry.computeboundingbox beforehand.
...sphere in a similar fashion as before, there is a sphere.intersectssphere method to perform this test.

Bounce off the walls - Game development
all bouncing off the top edge, so now let's think about the bottom edge: if(y + dy > canvas.height) { dy = -dy; } if the ball's y position is greater than the height of the canvas (remember that we count the y values from the top left, so the top edge starts at 0 and the bottom edge is at 320 pixels, the canvas' height), then bounce it off the bottom edge by reversing the y axis movement as before.
...it is very similar actually, all you have to do is to repeat the statements for x instead of y: if(x + dx > canvas.width || x + dx < 0) { dx = -dx; } if(y + dy > canvas.height || y + dy < 0) { dy = -dy; } at this point you should insert the above code block into the draw() function, just before the closing curly brace.
...we have another problem however — when the ball hits each wall it sinks into it slightly before changing direction: this is because we're calculating the collision point of the wall and the center of the ball, while we should be doing it for its circumference.

Buttons - Game development
you only want the ball to move when the button is pressed, not before!
... keeping the paddle still before the game starts it works as expected, but we can still move the paddle when the game hasn't started yet, which looks a bit silly.
...to do that, adjust the update() function like so: function update() { game.physics.arcade.collide(ball, paddle, ballhitpaddle); game.physics.arcade.collide(ball, bricks, ballhitbrick); if(playing) { paddle.x = game.input.x || game.world.width*0.5; } } that way the paddle is immovable after everything is loaded and prepared, but before the start of the actual game.

Hoisting - MDN Web Docs Glossary: Definitions of Web-related terms
learn more technical example one of the advantages of javascript putting function declarations into memory before it executes any code segment is that it allows you to use a function before you declare it in your code.
...now, let's see what happens when we call the function before we write it: catname("chloe"); function catname(name) { console.log("my cat's name is " + name); } /* the result of the code above is: "my cat's name is chloe" */ even though we call the function in our code first, before the function is written, the code still works.
...the variables can be initialized and used before they are declared.

XInclude - MDN Web Docs Glossary: Definitions of Web-related terms
i=0; i < xincludes.length; i++) { var xinclude = xincludes[i]; var href = xinclude.getattribute('href'); var parse = xinclude.getattribute('parse'); var xpointer = xinclude.getattribute('xpointer'); var encoding = xinclude.getattribute('encoding'); // e.g., utf-8 // "text/xml or application/xml or matches text/*+xml or application/*+xml" before encoding (then utf-8) var accept = xinclude.getattribute('accept'); // header "accept: "+x var acceptlanguage = xinclude.getattribute('accept-language'); // "accept-language: "+x var xifallback = xinclude.getelementsbytagnamens('http://www.w3.org/2001/xinclude', 'fallback')[0]; // only one such child is allowed if (href === '' || href === null) { //...
...ll-formed document response responsenodes = [response.documentelement]; // put in array so can be treated the same way as the above } // prepend any node(s) (as xml) then remove xinclude for (j=0; j < responsenodes.length ; j++) { xincludeparent.insertbefore(responsenodes[j], xinclude); } xincludeparent.removechild(xinclude); } else if (responsetype === 'responsetext') { if (encname) { var encodingtype = response.match(pattern); if (encodingtype) { ...
...h response now (as plain text or xml) } } } catch (e) { // use xi:fallback if xinclude retrieval above failed var xifallbackchildren = xifallback.childnodes; // prepend any node(s) then remove xinclude for (j=0; j < xifallbackchildren.length ; j++) { xincludeparent.insertbefore(xifallbackchildren[j], xinclude); } xincludeparent.removechild(xinclude); } } } return docu; } ...

WAI-ARIA basics - Learn web development
for example, html5 introduced a number of semantic elements to define common page features (<nav>, <footer>, etc.) before these were available, developers would simply use <div>s with ids or classes, e.g.
...before you continue, you should get a screenreader testing setup put in place, so you can test some of the examples as you go through.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: wai-aria.

Fundamental CSS comprehension - Learn web development
the final step before you move on is to attempt the assessment for the module — this involves a number of related exercises that must be completed in order to create the final design — a business card/gamer card/social media profile.
... prerequisites: before attempting this assessment you should have already worked through all the articles in this module.
...using any technique that you know, track these down and fix them before moving on.

Introduction to CSS layout - Learn web development
going back to our original non-positioned example, we could add the following css rule to implement absolute positioning: .positioned { position: absolute; top: 30px; left: 30px; } here we give our middle paragraph a position value of absolute, and the same top and left properties as before.
... table layout html tables are fine for displaying tabular data, but many years ago — before even basic css was supported reliably across browsers — web developers used to also use tables for entire web page layouts — putting their headers, footers, different columns, etc.
... you'll notice that the caption paragraph has been given display: table-caption; — which makes it act like a table <caption> — and caption-side: bottom; to tell the caption to sit on the bottom of the table for styling purposes, even though the markup is before the <input> elements in the source.

Legacy layout methods - Learn web development
previous overview: css layout next grid systems are a very common feature used in css layouts, and before css grid layout they tended to be implemented using floats or other layout features.
... layout and grid systems before css grid layout it may seem surprising to anyone coming from a design background that css didn’t have an inbuilt grid system until very recently, and instead we seemed to be using a variety of sub-optimal methods to create grid-like designs.
...if we wanted to leave an empty column space before the first container — or between containers — we would need to create an offset class to add a left margin to our site to push it across the grid visually.

Normal Flow - Learn web development
prerequisites: the basics of html (study introduction to html), and an idea of how css works (study introduction to css.) objective: to explain how browsers layout web pages by default, before we begin to make changes.
... before digging deeper into different layout methods, it is worth revisiting some of the things you will have studied in previous modules with regard to normal document flow.
... if two adjacent elements both have the margin set on them and the two margins touch, the larger of the two remains, and the smaller one disappears — this is called margin collapsing, and we have met this before too.

Styling links - Learn web development
the outline is a useful accessibility aid, so think carefully before turning it off; you should at least double up the styles given to the link hover state on the focus state too.
...we'll skip over most of the css, as it's just the same information you've looked at before.
... this assessment tests all the knowledge discussed in this module, so you might want to read the next article before moving on to it.

Basic native form controls - Learn web development
here is a basic single line text field example: <input type="text" id="comment" name="comment" value="i'm a text field"> single line text fields have only one true constraint: if you type text with line breaks, the browser removes those line breaks before sending the data to the server.
...address), so the data is encrypted before it is sent.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: basic controls.

How to structure a web form - Learn web development
for example, some screen readers such as jaws and nvda will speak the legend's content before speaking the label of each control.
...the rule must be included before it is used so that sighted users and users of assistive technologies such as screen readers can learn what it means before they encounter a required element.
...you can find a further test to verify that you've retained this information before you move on — see test your skills: form structure.

The web and web standards - Learn web development
don't break the web another phrase you'll hear around open web standards is "don't break the web" — the idea is that any new web technology that is introduced should be backwards compatible with what went before it (i.e.
... there are another class of languages called back-end (or server-side) languages, meaning that they are run on the server before the result is then sent to the browser to be displayed.
... a typical use for a server-side language is to get some data out of a database and generate some html to contain the data, before then sending the html over to the browser to display it to the user.

Creating hyperlinks - Learn web development
block level links as mentioned before, almost any content can be made into a link, even block-level elements.
...find details on our <a href="contacts.html">contacts page</a>.</p> moving down into subdirectories: if you wanted to include a hyperlink inside index.html (the top level index.html) pointing to projects/index.html, you would need to go down into the projects directory before indicating the file you want to link to.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: links.

HTML text fundamentals - Learn web development
emove all the seeds and stalk from the pepper, and chop coarsely.</li> <li>add all the ingredients into a food processor.</li> <li>process all the ingredients into a paste.</li> <li>if you want a coarse "chunky" hummus, process it for a short time.</li> <li>if you want a smooth hummus, process it for a longer time.</li> </ol> since the last two bullets are very closely related to the one before them (they read like sub-instructions or choices that fit below that bullet), it might make sense to nest them inside their own unordered list, and put that list inside the current fourth bullet.
...elements like this, which only affect presentation and not semantics, are known as presentational elements and should no longer be used, because as we've seen before, semantics is so important to accessibility, seo, etc.
...you can find some further tests to verify that you've retained this information before you move on—see test your skills: html text basics.

Making asynchronous programming easier with async and await - Learn web development
you'll note that we've wrapped the code inside a function, and we've included the async keyword before the function keyword.
...instead of needing to chain a .then() block on to the end of each promise-based method, you just need to add an await keyword before the method call, and then assign the result to a variable.
... async/await class methods as a final note before we move on, you can even add async in front of class/object methods to make them return promises, and await promises inside them.

Asynchronous JavaScript - Learn web development
get started prerequisites asynchronous javascript is a fairly advanced topic, and you are advised to work through javascript first steps and javascript building blocks modules before attempting this.
...you should understand these concepts before working through the other articles in the module.
...the former allows standard functions to implicitly behave asynchronously with promises, whereas the latter can be used inside async functions to wait for promises before the function continues.

Introduction to web APIs - Learn web development
note: if you are not already familiar with how objects work, you should go back and work through our javascript objects module before continuing.
...if you are not already familiar with how client-side web api events work, you should go and read this article first before continuing.
...at the time of writing, our web audio api example wouldn't work locally on google chrome — we had to upload it to github before it would work.

Video and Audio APIs - Learn web development
icons: @font-face { font-family: 'heydingscontrolsregular'; src: url('fonts/heydings_controls-webfont.eot'); src: url('fonts/heydings_controls-webfont.eot?#iefix') format('embedded-opentype'), url('fonts/heydings_controls-webfont.woff') format('woff'), url('fonts/heydings_controls-webfont.ttf') format('truetype'); font-weight: normal; font-style: normal; } button:before { font-family: heydingscontrolsregular; font-size: 20px; position: relative; content: attr(data-icon); color: #aaa; text-shadow: 1px 1px 0px black; } first of all, at the top of the css we use a @font-face block to import a custom web font.
... next we use generated content to display an icon on each button: we use the ::before selector to display the content before each <button> element.
... first of all, add the following lines inside the stopmedia() function — anywhere will do: rwd.classlist.remove('active'); fwd.classlist.remove('active'); clearinterval(intervalrwd); clearinterval(intervalfwd); now add the same lines again, at the very start of the playpausemedia() function (just before the start of the if statement).

Handling text — strings in JavaScript - Learn web development
"missing; before statement").
...in javascript, we do this by putting a backslash just before the character.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: strings.

Useful string methods - Learn web development
now, before your brain starts melting, don't worry!
...this can be useful for example if you want to normalize all user-entered data before storing it in a database.
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: strings.

JavaScript First Steps - Learn web development
in our first javascript module, we first answer some fundamental questions such as "what is javascript?", "what does it look like?", and "what can it do?", before moving on to taking you through your first practical experience of writing javascript.
... get started prerequisites before starting this module, you don't need any previous javascript knowledge, but you should have some familiarity with html and css.
... you are advised to work through the following modules before starting on javascript: getting started with the web (which includes a really basic javascript introduction).

Object prototypes - Learn web development
note: before ecmascript 2015, there wasn't officially a way to access an object's prototype directly — the "links" between the items in the chain are defined in an internal property, referred to as [[prototype]] in the specification for the javascript language (see ecmascript).
...you can find some further tests to verify that you've retained this information before you move on — see test your skills: object-oriented javascript.
... note that this set of tests relies on some of the knowledge taught in the next article, so you might want to read that first before you try them.

JavaScript — Dynamic client-side scripting - Learn web development
before attempting to learn javascript, you are strongly advised to get familiar with at least these two technologies first, and perhaps others as well.
... javascript first steps in our first javascript module, we first answer some fundamental questions such as "what is javascript?", "what does it look like?", and "what can it do?", before moving on to taking you through your first practical experience of writing javascript.
... client-side web apis when writing client-side javascript for web sites or applications, you won't go very far before you start to use apis — interfaces for manipulating different aspects of the browser and operating system the site is running on, or even data from other web sites or services.

Properly configuring server MIME types - Learn web development
for perl cgi, you should have the line print "content-type: text/html\n\n"; before any other output lines.
... for php, you should have the line header('content-type: text/html'); before any other output lines.
... for asp, you should have the line response.contenttype = "text/html"; before any other output lines.

Getting started with React - Learn web development
before the return statement of app, add const subject = 'react';.
...go ahead and do that before the return statement, like so: function app(props) { console.log(props); return ( // return statement ); } save your file and check your browser's javascript console.
...before we do that, however, let's recap some of the things we’ve learned.

Dynamic behavior in Svelte: working with variables and props - Learn web development
find the <h2> heading with an id of list-heading and replace the hardcoded number of active and completed tasks with dynamic expressions: <h2 id="list-heading">{completedtodos} out of {totaltodos} items completed</h2> go to the app, and you should see the "2 out of 3 items completed" message as before, but this time the information is coming from the todos array.
... <todos {todos} /> at this point your todos should render just like they did before, except that now we're passing them in from the app.svelte component.
...in this case, the preventdefault modifier tells svelte to generate the code to call event.preventdefault() before running the handler.

Adding a new todo form: Vue events, methods, and models - Learn web development
add a blank <template> and a <script> tag like before: <template></template> <script> export default {}; </script> let's add in an html form that lets you enter a new todo item and submit it into the app.
...the first, .trim, will remove whitespace from before or after the input.
... let's make a further improvement before we move on.

Tools and testing - Learn web development
get started prerequisites you should really learn the basics of the core html, css, and javascript languages first before attempting to use many the tools detailed here.
... for example, you'll need to know the fundamentals of these languages before you start debugging problems in complex web code, making effective use of javascript frameworks, or writing tests and running them against your code using test runners.
...this module gives you some fundamental background knowledge about how client-side frameworks work and how they fit into your toolset, before moving on to tutorial series covering some of today's most popular ones.

Testopia
if you are upgrading, please reverse the existing version's patch before installing.
...you can then merge your changes before deleting the old version.
... as always please backup your installation before attempting to install or upgrade.

Chrome registration
note: versions of gecko before gecko 1.8.0.13 and gecko 1.8.1.5 contained a bug where if you use the comparisons <, > or =, the version string had be two or more characters long.
...this is very helpful when trying to write a chrome.manifest file as you can inspect where the files are being mapped from (jar files, local directory, etc.) old-style contents.rdf manifests before the plaintext manifests were introduced (which happened in firefox 1.5, toolkit 1.8), rdf manifests named "contents.rdf" were used to register chrome.
... this format is deprecated; however, seamonkey versions before version 2 do not support the plaintext manifest format yet, so contents.rdf manifests are required for extensions that wish to maintain backwards compatibility with firefox 1.0 or the suite.

Creating reftest-based unit tests
in order to test invalidation it is important that invalidation tests let the document completely finish loading and displaying before making the changes for which invalidation and repainting is to be tested.
... making the changes before the document has completely finished loading and painting would mean that the test may not actually test the browser's invalidation logic, since the changed parts of the document may end up displaying correctly purely due to a pending post-load paint.
...the 'mozreftestinvalidate' event is designed to fire as soon after the initial rendering of the document is finished as possible, but never before.

Debugging on Mac OS X
disabling sip has system security implications that should be understood before taking this step.
... creating an xcode project if you try to create a new xcode project in an existing directory then xcode will delete its existing contents (xcode will warn you beforehand).
... before going any further, close the project (file > close project) and open finder.

Configuring Build Options
please read the following directions carefully before building, and follow them in order.
... other options mk_add_options autoclobber=1 if a clobber would be required before a build, this will cause mach to clobber and continue with the build instead of asking the user to manually clobber and exiting.
...this can be useful since certain warnings coincide with reviewbot lints which must be fixed before merging.

Simple Instantbird build
windows build prerequisites gnu/linux build prerequisites mac os x build prerequisites tip: after completing setup for your os, and before you get the source, you can opt to add the progressextension to your mercurial.ini (for windows) or .hgrc (for *nix / mac) file.
... then just re-run the mach command above (you may need to clobber (see below), or you can do the addition before running make for the first time).
... upstream changes to fetch the latest upstream changes, in your comm-central directory, run the same command as before: python client.py checkout problems building?

Eclipse CDT
before you use eclipse with the mozilla source you must increase its memory limits.
...(if you're thinking of adding tips, please first consider how widely useful they'll be before adding to this already lengthy page.) for further documentation see the official eclipse user guide and eclipse cdt user guide.
...update 2017-11-04 by jwatt: ticking the "index all header variants" option caused eclipse to blow through the 12 gb of ram i'd given it while indexing before it ran out of memory and crashed.) there are parser errors it is expected that eclipse will show parser errors even for a known-good copy of the mozilla source.

Error codes returned by Mozilla APIs
these components usually provide an initialization method, often called init, which must be called before other methods are used.
...use nsifile.exists() to check if the file exists beforehand.
...for example, an attempt was made to use the element.insertbefore method to insert a node before one that is not a child.

Storage access policy: Block cookies from trackers
as described above, note that nightly may include additional protections that end up getting removed or changed before they reach our release users.
... as mentioned before, the way to know that you will be able to use storage as a third-party going forward will be using the storage access api.
...depending on the type of integration, the user may have to take some action to interact with the social content provider before the provider is given access to their cookies.

HTTP Cache
the response payload) to write to the cache entry, it must open the output stream on it before it calls metadataready.
...the data will be available as the writer writes data to the cache entry's output stream immediately, even before the output stream is closed.
... lifetime of an existing entry that doesn't pass server revalidation such a cache entry is first examined in the nsicacheentryopencallback.oncacheentrycheck callback, where the consumer finds out it must be revalidated with the server before use.

Extending a Protocol
it's quite involved and, unfortunately, all steps need to be done before we can successfully recompile.
... we need to add the following things: at the top of the file: include protocol pecho; after "manager pbrowser or pinprocess;", add: manages pecho; finally, under parent: add async pecho(); - this is the "constructor" part we talked about before, which will allow us to eventually send messages.
... defining echoparent.h like before, create ./dom/ipc/echoparent.h, and code it as follows - the inline comments describe what's going on.

Bootstrapping a new locale
(you should "cd" to the directory before beginning.) in the terminal, type the following command: $ hg clone http://hg.mozilla.org/releases/mozilla-x.x.x/ where "x.x.x" is the existing release branch version.
... before you run the copy commands, you need to make the locale directory at the same level as the mozilla-1.9.x/ you just cloned from above.
... working with bit bucket before a team becomes official, we like to get the localizers comfortable with the hg commands that allow for cloning, pulling, committing, and pushing work to an experimental repository.

Localizing without a specialized tool
before we start, did you make sure to install mercurial and confirm that you have set up the proper build environment on your local machine?
... you can do this by typing: cd ../../ where each ".." represents the prior sub directory before the main directory where you want to be.
... you can do this by typing: cd ../../ where each ".." represents the prior sub directory before the main directory where you want to be.

Release phase
configuration before you try pushing, you need to tell ssh which username you wish to use for connecting with hg.mozilla.org.
...the output will look something like this: comparing with ssh://hg.mozilla.org/releases/l10n-central/x-testing searching for changes changeset: 0:7c543e8f3a6a tag: tip user: your name <email@example.com> date: mon nov 23 18:08:25 2009 +0100 summary: added search bar strings make sure this output is accurate before continuing.
... sign-offs do not need to be approved before revision merge between release channels, although it is recommended.

Creating localizable web applications
in general though, we should consider implementing such decorations as css images (background-image or ::after's/::before's content) and then select them with "html[dir="rtl"] > ...".
...bad: <div class="tut_didyouknow"> <img src="/static/img/question-64.png" class="tut_icon"> <?printf (_("did you know you can test a persona before you submit it?
...good: css: div.tut_didyouknow { background: url(/static/img/question-64.png) no-repeat 0 0; padding-left: 64px; } html[dir='rtl'] div.tut_didyouknow { background-image: url(/static/img/question-64.png); background-position: 100% 0; padding-left: 0; padding-right: 64px; } html/php: <div class="tut_didyouknow"> <?printf (_("did you know you can test a persona before you submit it?

Profiling with the Firefox Profiler
it's a good idea to search bugzilla before filing a bug about a performance problem in firefox but sometimes it's hard to find issues that have already been reported.
...this example is for firefox nightly (package name is org.mozilla.fennec_aurora), and you have to allow storage access on permission settings before launching it.
...cleopatra doesn't currently understand this prefix, so it needs to be removed before pasting.

Reporting a Performance Problem
wait until the "symbolicating call stacks" notification disappears before sharing the profile.
...before uploading, the publish button asks you what data you'd like to publish to our servers.
...before you do this, please share the performance profile with the addon authors through a bug report.

Introduction to NSPR
pr_cleanup waits for the last user thread to exit before returning, whereas it ignores system threads when determining when a process should exit.
...the thread must also reinstate the monitored invariant before exiting the monitor.
...this assumption implies that the monitored invariant must be reinstated before calling pr_waitcondvar.

PR_WaitCondVar
timeout the value pr_interval_no_timeout requires that a condition be notified (or the thread interrupted) before it will resume from the wait.
... description before the call to pr_waitcondvar, the lock associated with the condition variable must be held by the calling thread.
...to detect the expiration of the specified interval, call pr_intervalnow before and after the call to pr_waitcondvar and compare the elapsed time with the specified interval.

NSS PKCS11 Functions
if you want to preserve it, copy the string before freeing the slot.
...if you want to preserve it, copy the string before freeing the slot.
...several functions in the nss libraries use the password callback function to obtain the password before performing operations that involve the protected information.

Python binding for NSS
if a python unicode object is passed to a nss/nspr function it will be encoded as utf-8 first before being passed to nss/nspr.
...depercated elements will persist for a least two releases before being removed from the api entirely.
...thus a socket object behaves like a file object and must be closed once for each makefile() call before it's actually closed.

Invariants
a jsnative or other callback may move cx to another compartment, as long as it returns cx to the script's compartment before returning.
...so code must check js_validcontextpointer(ownercx) before dereferencing it.
...(taken together, ecma 262-3 §11.13.1 and ecma 262-3 §10.1.4 specify that in an assignment such as x = f(), the name lookup for x occurs before f is called.

Property cache
when recording a getprop, the jit needs to know the result type before the interpreter executes the instruction.
... ↓ o ----> o ----> o ----> o ^global ^x' (----> indicates proto as before; downward arrows ↓ indicate the parent relation) method guarantee — if at time t0 the object x has shape s; and x has an own property p that is a method property (transparently joined function); and at time t1 an object y has shape s; and no shape-regenerating gc occurred; then at time t1 y's own property p is the same method property.
...(informally: changing an object's prototype changes its shape and the shape of every object that was on its prototype chain before the change.

Tracing JIT
frame reconstruction is necessary because a trace may inline a number of function calls, and may exit before those function calls return.
...when a guard bails, it means that there is no logic in the trace to handle the failed guard, and so the exit condition encodes the state of the interpreter before the guarded condition.
...a deep bail is special only insofar as it requires flushing the full set of deferred writes in the trace if it occurs (and further, requires that all registers holding temporary trace operands have flushed to the native stack before execution).

JS_ClearContextThread
before transferring a jscontext from thread a to thread b, thread a must call js_clearcontextthread.
... before thread b uses the jscontext, it must call js_setcontextthread.
... this is the first thing thread b does with the context, before beginning a request.

JS_NewGlobalObject
this api provides a way for consumers to set slots atomically (immediately after the global is created), before any debugger hooks are fired.
... if callers have no additional state on the global to set up, they may pass fireonnewglobalhook to js_newglobalobject, which causes that function to fire the hook as its final act before returning.
...but otherwise, callers must take care to fire the hook exactly once before compiling any script in the global's scope (we have assertions in place to enforce this).

TPS Tests
one alternative is to put underscores before the "disabled" preferences, e.g.
...this will cause tps to set the firstsync pref to the relevant value before syncing, so that the described actionwill take place logger.loginfo(msg) logs the given message to the tps log.
...the sync_wipe_server argument causes tps to set the firstsync="wipeserver" pref before syncing, in case the sync account already contains data (this is typically unnecessary, and done largely as an example).

Handling Mozilla Security Bugs
we understand and acknowledge the concerns of those who believe that too-hasty disclosure of exploit details can provide a short-term advantage to potential attackers, who can exploit a problem before most end users become aware of its existence.
... to establish, for each bug, the amount of information a distributor can reveal immediately (before a fix is available) without putting other distributors and their customers at risk.
... however, we will ask all individuals and organizations reporting security bugs through bugzilla to follow the voluntary guidelines below: before making a security bug world-readable, please provide a few days notice to the mozilla security bug group by sending an email to the private security bug group mailing list.

Gecko object attributes
margin-left specifies how much horizontal space there will be before the beginning of each line of content in a text accessible (see the css margin-left property).
... margin-top specifies how much vertical space there will be before the top of the first line of content in a text accessible (see the css margin-top property).
... text-indent specifies how much horizontal space should be left before beginning of the first line of the text content of an text accessible (see the css text-indent property).

Mork
a minus before the table id indicates that all the rows currently stored in the table should be removed before adding more rows.
... a minus sign before a row or rowreference indicates that said row should be removed from the table.
...the presence of an initial minus means to delete all cells before adding new cells.

Places Expiration
on shutdown most of the times the adaptive algorithm will ensure the database is clean before shutdown, so the only task executed on shutdown will be removal of session data (like session annotations).
... in some cases, like when a clear history is executed just before shutdown, a larger step is executed instead.
... places.history.expiration.max_pages: the maximum number of pages that may be retained in the database before starting to expire.

Accessing the Windows Registry Using XPCOM
second, you must call open() on the key before attempting to read a value.
... opening registry keys before doing anything with a registry key you must first open the key you are interested in.
...e demonstrates writing a new string value: var wrk = components.classes["@mozilla.org/windows-registry-key;1"] .createinstance(components.interfaces.nsiwindowsregkey); wrk.create(wrk.root_key_current_user, "software\\mdc\\test", wrk.access_write); wrk.writestringvalue("testvalue", "hello world!"); wrk.close(); checking the existence of keys and values before you attempt to read a value or open a child key, you should check to see whether it exists first.

An Overview of XPCOM
instead all exceptions must be handled within a given component, before crossing interface boundaries.
... ns_if_addref same as above but checks for null before calling addref.
... ns_if_release same as above but check for null before calling release.

Creating the Component Code
component registration all xpcom components - whether they're stored in shared libraries (dlls, dsos, dylibs), javascript files, or otherwise - need to be registered before they can be used.
... onion peel view of xpcom component creation before we begin looking at the various parts of the component and how they'll be implemented in the source, let's look at the module in weblock.cpp to see where we're going.
...pports *aouter, const nsiid & iid, void * *result) { if (!result) return ns_error_invalid_arg; sample* sample = new sample(); if (!sample) return ns_error_out_of_memory; nsresult rv = sample->queryinterface(iid, result); if (ns_failed(rv)) { *result = nsnull; delete sample; } return rv; } weblock1.cpp before any of the improvements and xpcom tools we describe in the following chapter are brought in, the source code for the weblock component that implements all the necessary interfaces looks like this.

Finishing the Component
before attempting to use unfrozen interfaces, you should contact the developers who are responsible for the code you're trying to use (i.e., module owners) and ask them how best to do what you are trying to do.
... the method that handles the check before page loading and the only method we care about in our own implementation of nsicontentpolicy is shouldload().
...this ensures that the urls are canonical before they are compared.

Introduction to XPCOM for the DOM
in the first case, if we forget to addref the object, the object may delete itself before we are done using the pointer, which would cause a crash when dereferencing it.
...you should however be absolutely sure of what you are doing before coding such a cast.
...from my own experience unfortunately it sometimes necessary to build "distclean" before it works.

imgILoader
this means that callers of loadimage should make sure to cancel() the resulting request before the observer goes away.
...this means that callers of loadimagewithchannel should make sure to cancel() the resulting request before the observer goes away.
...this must already be opened before this method is called, and there must have been no ondataavailable calls for it yet.

nsIAccessibleText
tafteroffset(in long offset, in nsaccessibletextboundary boundarytype, out long startoffset, out long endoffset); astring gettextatoffset(in long offset, in nsaccessibletextboundary boundarytype, out long startoffset, out long endoffset); nsipersistentproperties gettextattributes(in boolean includedefattrs, in long offset, out long rangestartoffset, out long rangeendoffset); astring gettextbeforeoffset(in long offset, in nsaccessibletextboundary boundarytype, out long startoffset, out long endoffset); void removeselection(in long selectionnum); void scrollsubstringto(in long startindex, in long endindex, in unsigned long scrolltype); void scrollsubstringtopoint(in long startindex, in long endindex, in unsigned long coordinatetype, in long x, in long y); void setselectionbounds(i...
... return value exceptions thrown missing exception gettextbeforeoffset() string methods may need to return multibyte-encoded strings, since some locales can't be encoded using 16-bit chars.
...astring gettextbeforeoffset( in long offset, in nsaccessibletextboundary boundarytype, out long startoffset, out long endoffset ); parameters offset boundarytype startoffset endoffset return value removeselection() void removeselection( in long selectionnum ); parameters selectionnum scrollsubstringto() makes a specific part of string visible on screen.

nsIBrowserSearchService
to access this service, use: var browsersearchservice = components.classes["@mozilla.org/browser/search-service;1"] .getservice(components.interfaces.nsibrowsersearchservice); attempting to use any method or attribute of this interface before init() has completed will force the service to fall back to a slower, synchronous, initialization.
... confirm a boolean value indicating whether the user should be asked for confirmation before this engine is added to the list.
... attempting to call any method of this interface before init() has completed will force the service to fall back to a slower, synchronous, initialization.

nsIChannel
setting contentcharset before the channel has been opened provides a hint to the channel on what the charset should be.
... setting contenttype before the channel has been opened provides a hint to the channel as to what the mime type is.
... if the nsirequest object passed to the stream listener's methods is not this channel, an appropriate onchannelredirect notification needs to be sent to the notification callbacks before onstartrequest is called.

nsIFilePicker
this should be set before calling open() or show().
...this should be set this before calling open() or show() to specify a starting point.
...if you would like to use another you must append it separately before the others you want to go into the drop down list.

nsIHttpServer
ady_initialized * if this server is already started * @throws ns_error_not_available * if the server is not started and cannot be started on the desired port * (perhaps because the port is already in use or because the process does * not have privileges to do so) * @note * behavior is undefined if this method is called after stop() has been * called on this but before the provided callback function has been * called.
... */ void start(in long port); /** * shuts down this server if it is running (including the period of time after * stop() has been called but before the provided callback has been called).
... * * @param path * the path on the server (beginning with a "/") which is to be handled by * handler; this path must not include a query string or hash component; it * also should usually be canonicalized, since most browsers will do so * before sending otherwise-matching requests * @param handler * an object which will handle any requests for the given path, or null to * remove any existing handler; if while the server is running the handler * throws an exception while responding to a request, an http 500 response * will be returned * @throws ns_error_invalid_arg * if path does not begin with a "/" */ ...

nsINavHistoryResultViewObserver
olumn column); void oncyclecell(in long row, in nsitreecolumn column); void onselectionchanged(); void onperformaction(in wstring action); void onperformactiononrow(in wstring action, in long row); void onperformactiononcell(in wstring action, in long row, in nsitreecolumn column); constants constant value description drop_before -1 the drag operation wishes to insert the dragged item before the indicated row.
... orientation whether the drag target is before, after, or on the indicated row.
... orientation drop_before, drop_on, or drop_after, indicating whether the drop destination is before, on, or after the target row.

nsIRequest
by default, cached content is automatically validated if necessary before reuse.
... note: these flags are intended for normal browsing, and they should therefore not apply to content that must be validated before each use.
...according to rfc2616, this response must be validated before it can be taken from a cache.

nsIWebBrowser
the embedder must associate the two by setting this property to point to the chrome object before creating the browser window via the browser's nsibasewindow interface.
...the embedder must explicitly set this value back to nsnull if the chrome object is destroyed before the browser object.
...in that case, the embedder should explicitly set this value back to null if the parent content listener is destroyed before the browser object.

nsIXPConnect
if the caller intends to use the return value from this call, the caller is responsible for rooting the jsval before making a call to this method.
...it is a good idea to transfer the jsobject to some equally protected place before releasing the holder (i.e., use js_setproperty to make this object a property of some other jsobject).
... this method will never wrap the jsobject involved in an xpcnativewrapper before returning.

Reference Manual
if you've never use nscomptrs before, you might want to read the getting started guide first.
...we just failed to release p before putting a new pointer into it.
...getter_addrefs releases and clears out p before you assign into it, i.e., before getnext is called.

Initialization and Destruction - Plugins
initialization the browser calls np_initialize when a plug-in is loaded and before the first instance is created.
...this table is filled out by the browser before the initialization call.
...it is called once after the last instance of the plug-in is destroyed, before releasing the plug-in library itself.

All keyboard shortcuts - Firefox Developer Tools
before firefox 55, the keyboard shortcut was ctrl + shift + q (cmd + opt + q on a mac).
...before firefox 66, the letter in this shortcut was s.
... note: before firefox 66, the combination ctrl + shift + s on windows and linux or cmd + opt + s on macos would open/close the debugger.

Aggregate view - Firefox Developer Tools
before firefox 48, this was the default view of a heap snapshot.
... because tracing allocations has a runtime cost, it must be explicitly enabled by checking "record call stacks" before you allocate the memory in the snapshot.
...for example, dom event objects are allocated before the javascript is run and event handlers are called.

Examine and edit HTML - Firefox Developer Tools
::before and ::after you can inspect pseudo-elements added using ::before and ::after: custom element definition when you open the inspector on a page that includes custom elements, you can view the class definition for the custom element in the debugger: inspect the element click on the word custom the source for the element's class will be displayed in the debugger.
...e modification attribute modification node removal use in console show dom properties show accessibility properties change pseudo-class hover active focus focus-within visited screenshot node scroll into view copy inner html outer html css selector css path xpath image data-url attribute paste inner html outer html before after as first child as last child expand all collapse all open link in new tab * open file in debugger * open file in style-editor * copy link address * * these options only appear in certain contexts, for example the "open file in style-editor" option only appears when you context-click over the top of a link to a css file.
... (paste) before paste the clipboard contents into the document immediately before this node.

about:debugging - Firefox Developer Tools
before you connect: enable developer settings on your android device.
...next, disable every debugging setting already activated and repeat the steps described before.
... you don't have to package or sign the extension before loading it, and it stays installed until you restart firefox.

AudioBufferSourceNode.AudioBufferSourceNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetaudiobuffersourcenode() constructorchrome full support 55notes full support 55notes notes before version 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 55notes full support 55notes notes before version 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before version 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

Beacon API - Web APIs
requests are guaranteed to be initiated before a page is unloaded and they are run to completion, without requiring a blocking request (for example xmlhttprequest).
... the beacon interface addresses the needs of analytics and diagnostics code that typically attempts to send data to a web server before unloading the document.
...to solve this problem, analytics and diagnostics code will typically make a synchronous xmlhttprequest in an unload or beforeunload handler to submit the data.

BiquadFilterNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetbiquadfilternode() constructorchrome full support 55notes full support 55notes notes before chrome 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42notes full support 42notes notes before o...
... webview android full support 55notes full support 55notes notes before version 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before chrome 59, the default values were not supported.firefox android full support 53opera android full support 42notes full support 42notes notes before opera 46, the default values were not supported.safari ios ...
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

Basic animations - Web APIs
if we need to move it we have to redraw it and everything that was drawn before it.
... restore the canvas state if you've saved the state, restore it before drawing a new frame.
... requestanimationframe(callback) tells the browser that you wish to perform an animation and requests that the browser call a specified function to update an animation before the next repaint.

Transformations - Web APIs
saving and restoring state before we look at the transformation methods, let's look at two other methods which are indispensable once you start generating ever more complex drawings.
... when the second restore() statement is called, the original state (the one we set up before the first call to save) is restored and the last rectangle is once again drawn in black.
... it's a good idea to save the canvas state before doing any transformations.

DelayNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetdelaynode() constructorchrome full support 55notes full support 55notes notes before version 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 55notes full support 55notes notes before version 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before version 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

DisplayMediaStreamConstraints - Web APIs
processing information is specified using mediatrackconstraints objects providing options which are applied to the track after the media data is received but before it is made available on the mediastream.
...if a mediatrackconstraints object is provided here, an audio track is included in the stream, but the audio is processed to match the specified constraints after being retrieved from the hardware but before being added to the mediastream.
...optionally, a mediatrackconstraints object may be given, providing options specifying processing to be performed on the video data before adding it to the stream.

Document.createElement() - Web APIs
when called on an html document, createelement() converts tagname to lower case before creating the element.
... examples basic example this creates a new <div> and inserts it before the element with the id "div1".
...reate a new div element const newdiv = document.createelement("div"); // and give it some content const newcontent = document.createtextnode("hi there and greetings!"); // add the text node to the newly created div newdiv.appendchild(newcontent); // add the newly created element and its content into the dom const currentdiv = document.getelementbyid("div1"); document.body.insertbefore(newdiv, currentdiv); } web component example the following example snippet is taken from our expanding-list-web-component example (see it live also).

DynamicsCompressorNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetdynamicscompressornode() constructorchrome full support 55notes full support 55notes notes before chrome 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 55notes full support 55notes notes before version 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before chrome 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

Event.initEvent() - Web APIs
this method must be called to set the event before it is dispatched, using eventtarget.dispatchevent().
...— 17notes notes before firefox 17, a call to this method after the dispatching of the event raised an exception instead of doing nothing.ie full support yesopera full support yessafari full support yeswebview android full support yeschrome an...
...— 17notes notes before firefox 17, a call to this method after the dispatching of the event raised an exception instead of doing nothing.opera android full support yessafari ios full support yessamsung internet android full support yeslegend full support full supportdeprecated.

Event - Web APIs
animationevent audioprocessingevent beforeinputevent beforeunloadevent blobevent clipboardevent closeevent compositionevent cssfontfaceloadevent customevent devicelightevent devicemotionevent deviceorientationevent deviceproximityevent domtransactionevent dragevent editingbeforeinputevent errorevent fetchevent focusevent gamepadevent hashchangeevent idbversionchangeevent inputevent keyboardevent mediastreamevent me...
...setting its value to true before returning from an event handler prevents propagation of the event.
... event.explicitoriginaltarget read only the explicit original target of the event (mozilla-specific.) event.originaltarget read only the original target of the event, before any retargetings.

GainNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetgainnode() constructorchrome full support 55notes full support 55notes notes before chrome 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 55notes full support 55notes notes before chrome 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before chrome 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

In depth: Microtasks and the JavaScript runtime environment - Web APIs
it then runs any pending javascript tasks, then any pending microtasks, then performs any needed rendering and painting before looping again to check for pending tasks.
...in other words, microtasks can enqueue new microtasks and those new microtasks will execute before the next task begins to run, and before the end of the current event loop iteration.
... microtasks are another solution to this problem, providing a finer degree of access by making it possible to schedule code to run before the next iteration of the event loop begins, instead of having to wait until the next one.

IDBDatabase.transaction() - Web APIs
in firefox 40+ the complete event is fired after the os has been told to write the data but potentially before that data has actually been flushed to disk.
... the complete event may thus be delivered quicker than before, however, there exists a small chance that the entire transaction will be lost if the os crashes or there is a loss of system power before the data is flushed to disk.
...you're storing critical data that cannot be recomputed later) you can force a transaction to flush to disk before delivering the complete event by creating a transaction using the experimental (non-standard) readwriteflush mode (see idbdatabase.transaction.) this is currently experimental, and can only be used if the dom.indexeddb.experimental pref is set to true in about:config.

IDBTransaction.oncomplete - Web APIs
in firefox 40+ the complete event is fired after the os has been told to write the data but potentially before that data has actually been flushed to disk.
... the complete event may thus be delivered quicker than before, however, there exists a small chance that the entire transaction will be lost if the os crashes or there is a loss of system power before the data is flushed to disk.
...you're storing critical data that cannot be recomputed later) you can force a transaction to flush to disk before delivering the complete event by creating a transaction using the experimental (non-standard) readwriteflush mode (see idbdatabase.transaction.) this is currently experimental, and can only be used if the dom.indexeddb.experimental pref is set to true in about:config.

IDBTransaction - Web APIs
in firefox 40+ the complete event is fired after the os has been told to write the data but potentially before that data has actually been flushed to disk.
... the complete event may thus be delivered quicker than before, however, there exists a small chance that the entire transaction will be lost if the os crashes or there is a loss of system power before the data is flushed to disk.
...you're storing critical data that cannot be recomputed later) you can force a transaction to flush to disk before delivering the complete event by creating a transaction using the experimental (non-standard) readwriteflush mode (see idbdatabase.transaction.

IIRFilterNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetiirfilternode() constructorchrome full support 55notes full support 55notes notes before version 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 55notes full support 55notes notes before version 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before version 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

Intersection Observer API - Web APIs
this set of values serves to grow or shrink each side of the root element's bounding box before computing intersections.
... the intersection root and root margin before we can track the intersection of an element with a container, we need to know what that container is.
... similarly, if the intersectionratio is going down, we use the string decreasingcolor and replace the word "ratio" in that with the intersectionratio before setting the target element's background-color.

MutationObserver.observe() - Web APIs
there are some caveats to note: if you call observe() on a node that's already being observed by the same mutationobserver, all existing observers are automatically removed from all targets being observed before the new observer is activated.
...if you begin watching a subtree of nodes, and a portion of that subtree is detached and moved elsewhere in the dom, you continue to watch the detached segment of nodes, receiving the same callbacks as before the nodes were detached from the original subtree.
...this prevents you from missing changes that occur after the connection is severed and before you have a chance to specifically begin monitoring the moved node or subtree for changes.

Navigator.sendBeacon() - Web APIs
description this method is for analytics and diagnostics that send data to a server before the document is unloaded, where sending the data any sooner may miss some possible data collection.
... for example, which link the user clicked before navigating away and unloading the page.
... historically, this was addressed with some of the following workarounds to delay the page unload long enough to send data to some url: submitting the data with a blocking synchronous xmlhttprequest call in unload or beforeunload event handlers.

OfflineAudioCompletionEvent.OfflineAudioCompletionEvent() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetofflineaudiocompletionevent() constructorchrome full support 57notes full support 57notes notes before chrome 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 57notes full support 57notes notes before version 59, the default values were not supported.chrome android full support 57notes full support 57notes notes before chrome 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

ParentNode.prepend() - Web APIs
the parentnode.prepend() method inserts a set of node objects or domstring objects before the first child of the parentnode.
... syntax parentnode.prepend(...nodestoprepend); parameters nodestoprepend one or more nodes to insert before the first child node currently in the parentnode.
...argitem : document.createtextnode(string(argitem))); }); this.insertbefore(docfrag, this.firstchild); } }); }); })([element.prototype, document.prototype, documentfragment.prototype]); specification specification status comment domthe definition of 'parentnode.prepend()' in that specification.

Using the Payment Request API - Web APIs
paymentrequest.canmakepayment() can be used to check whether the paymentrequest object is capable of making a payment before you start the payment process.
... checking before all prices are known if the checkout flow needs to know whether paymentrequest.canmakepayment() will return true even before all line items and their prices are known, you can instantiate paymentrequest with dummy data and pre-query .canmakepayment().
... }).catch(function(error) { console.log(error); if (fallbacktolegacyonpaymentrequestfailure) { window.location.href = '/legacy-web-form-checkout'; } else { showcheckouterrortouser(); } }); } else { window.location.href = '/legacy-web-form-checkout'; } } note: see our checking user can make payments before prices are known demo for the full code.

PerformanceResourceTiming.encodedBodySize - Web APIs
the encodedbodysize read-only property represents the size (in octets) received from the fetch (http or cache), of the payload body, before removing any applied content-codings.
... if the resource is retrieved from an application cache or a local resource, it must return the size of the payload body before removing any applied content-codings.
... syntax resource.encodedbodysize; return value a number representing the size (in octets) received from the fetch (http or cache), of the payload body, before removing any applied content-codings.

PerformanceResourceTiming.fetchStart - Web APIs
the fetchstart read-only property represents a timestamp immediately before the browser starts to fetch the resource.
... if there are http redirects the property returns the time immediately before the user agent starts to fetch the final resource in the redirection.
... syntax resource.fetchstart; return value a domhighrestimestamp immediately before the browser starts to fetch the resource.

PushEvent - Web APIs
full support 17firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie no support noopera full support 37safari no support nowebview android no support nochrome android full support ...
... full support 17firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie no support noopera full support 37safari no support nowebview android no support nochrome android full support ...
... full support 17firefox full support 44notes full support 44notes notes extended support releases (esr) before firefox 78 esr do not support service workers and the push api.ie no support noopera full support 44safari no support nowebview android no support nochrome android full support ...

Web Push API Notifications best practices - Web APIs
say your program manager found a hiccup in the approvals and wants to get your feedback on something before she proceeds.
...every push notification should be useful and time-sensitive, and the user should always be asked for permission before sending the first one, and be offered an easy way to opt out of getting more in the future.
...for example, safari 12.1 now requires—and other browsers either already do, or are planning[1] to do so—that the user interact with the page in some way before the page can request permission to perform push notifications.

ReadableStream.cancel() - Web APIs
var searchterm = "service workers"; // chars to show either side of the result in the match var contextbefore = 30; var contextafter = 30; var caseinsensitive = true; var url = 'https://html.spec.whatwg.org/'; console.log(`searching '${url}' for '${searchterm}'`); fetch(url).then(response => { console.log('received headers'); var decoder = new textdecoder(); var reader = response.body.getreader(); var tomatch = caseinsensitive ?
... searchterm.tolowercase() : searchterm; var buffersize = math.max(tomatch.length - 1, contextbefore); var bytesreceived = 0; var buffer = ''; var matchfoundat = -1; return reader.read().then(function process(result) { if (result.done) { console.log('failed to find match'); return; } bytesreceived += result.value.length; console.log(`received ${bytesreceived} bytes of data so far`); buffer += decoder.decode(result.value, {stream: true}); // already found match & just context-gathering?
...buffer.tolowercase() : buffer).indexof(tomatch); } if (matchfoundat === -1) { buffer = buffer.slice(-buffersize); } else if (buffer.slice(matchfoundat + tomatch.length).length >= contextafter) { console.log("here's the match:") console.log(buffer.slice( math.max(0, matchfoundat - contextbefore), matchfoundat + tomatch.length + contextafter )); console.log("cancelling fetch"); reader.cancel(); return; } else { console.log('found match, but need more context…'); } // keep reading return reader.read().then(process); }); }).catch(err => { console.log("something went wrong.

Using the Screen Capture API - Web APIs
motion the cursor should only be visible while moving, and, at the discretion of the user agent, for a brief time before after moving.
... before starting a project that will require sharing of audio, be sure to check the browser compatibility in mediadevices.getdisplaymedia() to see if the browsers you wish compaibility with have support for audio in captured screen streams.
... authorizing capture of display contents before streaming of captured screen contents can begin, the user agent will ask the user to confirm the sharing request, and to select the content to share.

Streams API concepts - Web APIs
if you want another reader to start reading your stream, you typically need to cancel the first reader before you do anything else (although you can tee streams, see the teeing section below) note that there are two different types of readable stream.
...if you want another writer to start writing to your stream, you typically need to abort it before you then attach another writer to it.
...this means that up to 3 chunks can be enqueued before the high water mark is reached and backpressure is applied.

WaveShaperNode.WaveShaperNode() - Web APIs
desktopmobilechromeedgefirefoxinternet exploreroperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internetwaveshapernode() constructorchrome full support 55notes full support 55notes notes before chrome 59, the default values were not supported.edge full support ≤79firefox full support 53ie no support noopera full support 42safari ?
... webview android full support 55notes full support 55notes notes before chrome 59, the default values were not supported.chrome android full support 55notes full support 55notes notes before chrome 59, the default values were not supported.firefox android full support 53opera android full support 42safari ios ?
... samsung internet android full support 6.0notes full support 6.0notes notes before samsung internet 7.0, the default values were not supported.legend full support full support no support no support compatibility unknown compatibility unknownsee implementation notes.see implementation notes.

WaveShaperNode.oversample - Web APIs
oversampling is a technique for creating more samples (up-sampling) before applying a distortion effect to the audio signal.
... '2x' double the amount of samples before applying the shaping curve.
... '4x' multiply by 4 the amount of samples before applying the shaping curve.

WebGLRenderingContext.pixelStorei() - Web APIs
glint 0 0 to infinity opengl es 3.0 gl.pack_skip_pixels number of pixel locations skipped before the first pixel is written into memory.
... glint 0 0 to infinity opengl es 3.0 gl.pack_skip_rows number of rows of pixel locations skipped before the first pixel is written into memory glint 0 0 to infinity opengl es 3.0 gl.unpack_row_length number of pixels in a row.
... glint 0 0 to infinity opengl es 3.0 gl.unpack_image_height image height used for reading pixel data from memory glint 0 0 to infinity opengl es 3.0 gl.unpack_skip_pixels number of pixel images skipped before the first pixel is read from memory glint 0 0 to infinity opengl es 3.0 gl.unpack_skip_rows number of rows of pixel locations skipped before the first pixel is read from memory glint 0 0 to infinity opengl es 3.0 gl.unpack_skip_images number of pixel images skipped before the first pixel is read from memory glint 0 0 to infinity opengl es 3.0 examples setting the pixel storage mode affects the webglrenderingcontext.readpixels() operations, as well as unpacking of textures with...

Basic scissoring - Web APIs
the reason for this distinction is that fragment color (and other fragment values, such as depth) may be manipulated and changed several times during graphics operations before finally being written to the screen.
...scissoring is a distinct stage in the webgl/opengl graphics pipeline (it occurs after color clearing, but before color masking).
... before the actual pixels are updated, fragments must go through the scissor test.

Adding 2D content to a WebGL context - Web APIs
drawing the scene the most important thing to understand before we get started is that even though we're only rendering a square plane object in this example, we're still drawing in 3d space.
...ss around const programinfo = { program: shaderprogram, attriblocations: { vertexposition: gl.getattriblocation(shaderprogram, 'avertexposition'), }, uniformlocations: { projectionmatrix: gl.getuniformlocation(shaderprogram, 'uprojectionmatrix'), modelviewmatrix: gl.getuniformlocation(shaderprogram, 'umodelviewmatrix'), }, }; creating the square plane before we can render our square plane, we need to create the buffer that contains its vertex positions and put the vertex positions in it.
... function drawscene(gl, programinfo, buffers) { gl.clearcolor(0.0, 0.0, 0.0, 1.0); // clear to black, fully opaque gl.cleardepth(1.0); // clear everything gl.enable(gl.depth_test); // enable depth testing gl.depthfunc(gl.lequal); // near things obscure far things // clear the canvas before we start drawing on it.

Lifetime of a WebRTC session - Web APIs
it’s so big that years ago, smart people saw how big it was, how fast it was growing, and the limitations of the 32-bit ip addressing system, and realized that something had to be done before we ran out of addresses to use, so they started working on designing a new 64-bit addressing system.
...these need to be agreed upon before the webrtc session can begin.
... if you need to change the configuration of the connection in some way (such as changing to a different set of ice servers), you can do so before restarting ice by calling rtcpeerconnection.setconfiguration() with an updated rtcconfiguration dictionary before restarting ice.

Web Video Text Tracks Format (WebVTT) - Web APIs
optional cue settings with at least one space before the first and between each setting.
...any text before the active text in the payload is previous text .
...before start, it must be noted that you can make use of a notepad and then save the file as ‘.vtt’ file.

Fundamentals of WebXR - Web APIs
in this guide, we provide a fundamental overview of what webxr is and how it works, as well as providing a foundation for what you'll need to know before you even begin to learn to develop augmented reality and virtual reality experiences for the web.
... basic concepts before getting into too much detail, let's consider some basic concepts that you need to know before you learn how to develop xr code.
...webxr doesn't generally care which type of device you're using, and the rendering process is almost exactly the same as for vr, except you don't erase the background or skybox before rendering each frame.

WebXR Device API - Web APIs
foundations and basics fundamentals of webxr before diving into the details of how to create content using webxr, it may be helpful to read this overview of the technology, which includes introductions to terminology that may be unfamiliar to you, or which may be used in a new way.
... creating a mixed reality experience starting up and shutting down a webxr session before actually presenting a scene using an xr device such as a headset or goggles, you need to create a webxr session bound to a rendering layer that draws the scene for presentation in each of the xr device's displays so that the 3d effect can be presented to the user.
... permissions and security for webxr the webxr device api has several areas of security to contend with, from establishing feature-policy to ensuring the user intends to use the mixed reality presentation before activating it.

Web Audio API - Web APIs
you need to create an audiocontext before you do anything else, as everything happens inside a context.
...it is an audionode audio-processing module that causes a given gain to be applied to the input data before its propagation to the output.
... obsolete: script processor nodes before audio worklets were defined, the web audio api used the scriptprocessornode for javascript-based audio processing.

Window: popstate event - Web APIs
it happens after the new location has loaded (if needed), displayed, made visible, and so on, after the pageshow event is sent, but before the persisted user state information is restored and the hashchange event is sent.
... if new-entry doesn't currently contain an existing document, fetch the content and create its document before continuing.
... if the browser has state information it wishes to store with the current-entry before navigating away from it, it then does so.

WindowEventHandlers - Web APIs
windoweventhandlers.onbeforeprint is an eventhandler representing the code to be called when the beforeprint event is raised.
... windoweventhandlers.onbeforeunload is an eventhandler representing the code to be called when the beforeunload event is raised.
...creation of windoweventhandlers (properties where on the target before it).

WindowOrWorkerGlobalScope.setTimeout() - Web APIs
delay optional the time, in milliseconds (thousandths of a second), the timer should wait before the specified function or code is executed.
... html <p>live example</p> <button onclick="delayedalert();">show an alert box after two seconds</button> <p></p> <button onclick="clearalert();">cancel alert before it happens</button> javascript var timeoutid; function delayedalert() { timeoutid = window.settimeout(window.alert, 2*1000, 'that was really slow!'); } function clearalert() { window.cleartimeout(timeoutid); } result see also cleartimeout() example.
...currently-executing code must complete before functions on the queue are executed, thus the resulting execution order may not be as expected.

WritableStreamDefaultWriter.close() - Web APIs
the underlying sink will finish processing any previously-written chunks, before invoking the close behavior.
... return value a promise, which fulfills with the undefined if all remaining chunks were successfully written before the close, or rejects with an error if a problem was encountered during the process.
...ed = encoder.encode(message, { stream: true }); encoded.foreach((chunk) => { defaultwriter.ready .then(() => { return defaultwriter.write(chunk); }) .then(() => { console.log("chunk written to sink."); }) .catch((err) => { console.log("chunk error:", err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.

WritableStreamDefaultWriter.ready - Web APIs
the first uses ready to ensure that the writablestream is done writing and thus able to receive data before sending a binary chunk.
... the second also checks whether the the writablestream is done writing, but this time because the writing must be finished before the writer can be closed.
... defaultwriter.ready .then(function() { defaultwriter.write(chunk) .then(function() { console.log("chunk written to sink.); }) .catch(function(err) { console.log("chunk error: " + err); }); }); // call ready again to ensure that all chunks are written // before closing the writer.

XMLHttpRequest - Web APIs
it must be called before any other method calls.
... xmlhttprequest.timeout is an unsigned long representing the number of milliseconds a request can take before automatically being terminated.
...you must call setrequestheader()after open(), but before send().

XRSession - Web APIs
the select event is sent after the selectstart event is sent and immediately before the selectend event is sent.
... if select is not sent, then the select action was aborted before being completed.
...it is sent immediately before the squeezeend event is sent to indicate that the squeeze action is over.

ARIA live regions - Accessibility
including an aria-live attribute or a specialized live region role (such as role="alert") on the element you want to announce changes to works as long as you add the attribute before the changes occur — either in the original markup, or dynamically using javascript.
...because the live region has aria-live="polite", the screen reader will wait until the user pauses before announcing the update.
... <ul id="roster" aria-live="polite" aria-relevant="additions removals"> <!-- use javascript to add remove users here--> </ul> breakdown of aria live properties: aria-live="polite" indicates that the screen reader should wait until the user is idle before presenting updates to the user.

ARIA annotations - Accessibility
</li> <li><label>orange: <input type="radio" name="fruit" value="orange"></label></li> <li><label>banana: <input type="radio" name="fruit" value="banana"></label></li> </ul> </form> </section> insertions and deletions a common wish in online document systems like google docs is to be able to track changes, to see what reviewers or editors have suggested as changes to the text, before the managing editor or author accepts or rejects those changes.
...<mark> is a suitable element for this purpose (a comment is a reference annotation), so the annotation could look like this: <p>the last half of the song is a slow-rising crescendo that peaks at the <mark aria-details="thread-1">end of the guitar solo</mark>, before fading away sharply.</p> <div role="comment" id="thread-1" data-author="chris"> <h3>chris said</h3> <p class="comment-text">i really think this moment could use more cowbell.</p> <p><time datetime="2019-03-30t19:29">march 30 2019, 19:29</time></p> </div> note: if for some reason you can’t use the <mark> element in your application, you could also use <span role="mark"></span>.
... since aria-details can now accept multiple ids, we can associate multiple comments with the same annotation, like so: <p>the last half of the song is a slow-rising crescendo that peaks at the <mark aria-details="thread-1 thread-2">end of the guitar solo</mark>, before fading away sharply.</p> <div role="comment" id="thread-1" data-author="chris"> <h3>chris said</h3> <p class="comment-text">i really think this moment could use more cowbell.</p> <p><time datetime="2019-03-30t19:29">march 30 2019, 19:29</time></p> </div> <div role="comment" id="thread-2" data-author="chris"> <h3>marcus said</h3> <p class="comment-text">the guitar solo could do with a touch more chorus, and a slightly lower volume.</p> <p><time datetime="2019-03-29t15:35">march 29 2019, 15:35</time></p> </div> ...

ARIA: feed role - Accessibility
to ensure good user experience, avoid inserting or removing articles in the middle of a feed, load new articles before the user has reached the end of the feed, and provide keyboard commands for moving focus among articles so that keyboard users can navigate through your feed.
... providing reading mode keys for moving the reading cursor and dom focus past the end and before the start of the feed.
... control + home: move focus to the first focusable element before the feed.

Understandable - Accessibility
for example, focusing a navigation menu option should not change the displayed page — it should be activated before the display changes.
...the user should be warned/advised of the impending change before it occurs.
... a mechanism is available for confirming and correcting information before final submission.

CSS Animations tips and tricks - CSS: Cascading Style Sheets
our callback gets executed just before the next repaint of the document.
... the problem for us is that because it's before the repaint, the style recomputation hasn't actually happened yet!
...this time, the callback is run before the next repaint, which is after the style recomputation has occurred.

Handling content breaks in multicol - CSS: Cascading Style Sheets
breaks before and after boxes, which would include our heading example above.
... breaks before and after boxes the break-before and break-after properties are used to control breaks before and after elements.
... they take the following values when in a multicol context: auto avoid avoid-column column in this next example, we are forcing a column break before an h2 element.

Typical use cases of Flexbox - CSS: Cascading Style Sheets
this pattern, as basic as it seems, was difficult to achieve before flexbox.
...you could also use flex-start to place the space at the end of the items, flex-end to place it before them, or center to centre the navigation items.
... center item before flexbox, developers would joke that the hardest problem in web design was vertical centering.

Layout using named grid lines - CSS: Cascading Style Sheets
before defining the 1fr size of the column track i am also defining a line name of [col-start].
... this means that we will end up with a grid that has 12 column lines all named col-start before a 1fr width column.
...i don’t need to do any calculations, grid automatically removed my 10 pixel gutter track before assigning the space to the 1fr column tracks.

Logical properties for margins, borders and padding - CSS: Cascading Style Sheets
as these are new properties check browser support before using.
...as these are new properties check browser support before using.
... .box { border-block: 2px solid green; border-inline-width: 4px; border-inline-style: dotted; border-inline-color: rebeccapurple; } note: these two value shorthands shipped in firefox 66, check browser support before using as other browsers may not have implemented them yet.

Using CSS transitions - CSS: Cascading Style Sheets
before we look at code snippets, you might want to take a look at the live demo (assuming your browser supports transitions).
...the easy way to overcome this limitation is to apply a window.settimeout() of a handful of milliseconds before changing the css property you intend to transition to.
... as usual, you can use the addeventlistener() method to monitor for this event: el.addeventlistener("transitionend", updatetransition, true); you detect the beginning of a transition using transitionrun (fires before any delay) and transitionstart (fires after any delay), in the same kind of fashion: el.addeventlistener("transitionrun", signalstart, true); el.addeventlistener("transitionstart", signalstart, true); note: the transitionend event doesn't fire if the transition is aborted before the transition is completed because either the element is made display: none or the animating property's value is cha...

Introducing the CSS Cascade - CSS: Cascading Style Sheets
to simplify the development process, web developers often use a css reset style sheet, forcing common properties values to a known state before beginning to make alterations to suit their specific needs.
...no declaration is marked as !important, so the precedence order is author style sheets before user style sheets or user-agent stylesheet.
...therefore, it is the last one that is then selected: margin-left: 3px note that the declaration defined in the user css, though having a greater specificity, is not chosen as the cascade algorithm is applied before the specificity algorithm.

Specificity - CSS: Cascading Style Sheets
selector types the following list of selector types increases by specificity: type selectors (e.g., h1) and pseudo-elements (e.g., ::before).
... some rules of thumb: always look for a way to use specificity before even considering !important only use !important on page-specific css that overrides foreign css (from external libraries, like bootstrap or normalize.css).
...by indicating one or more elements before the element you're selecting, the rule becomes more specific and gets higher priority: <div id="test"> <span>text</span> </div> div#test span { color: green; } div span { color: blue; } span { color: red; } no matter the order, text will be green because that rule is most specific.

animation-delay - CSS: Cascading Style Sheets
the animation-delay css property specifies the amount of time to wait from applying the animation to an element before beginning to perform the animation.
... formal definition initial value0sapplies toall elements, ::before and ::after pseudo-elementsinheritednocomputed valueas specifiedanimation typediscrete formal syntax <time># examples see css animations for examples.
... 43 full support 43 full support 3prefixed prefixed implemented with the vendor prefix: -webkit-edge full support 12firefox full support 16notes full support 16notes notes before firefox 57, firefox does not repaint elements outside the viewport that are animated into the viewport with a delay.

counters() - CSS: Cascading Style Sheets
check the browser compatibility table carefully before using this in production.
... </ol> </li> <li></li> <li></li> <li> <ol> <li></li> <li> <ol> <li></li> <li></li> <li></li> </ol> </li> </ol> </li> </ol> css ol { counter-reset: listcounter; } li { counter-increment: listcounter; } li::marker { content: counters(listcounter, '.', upper-roman) ') '; } li::before { content: counters(listcounter, ".") " == " counters(listcounter, ".", lower-roman) ; } result decimal-leading-zero compared to lower-alpha html <ol> <li> <ol> <li></li> <li></li> <li></li> </ol> </li> <li></li> <li></li> <li> <ol> <li></li> <li> <ol> <li></li> <li></li> ...
... <li></li> </ol> </li> </ol> </li> </ol> css ol { counter-reset: count; } li { counter-increment: count; } li::marker { content: counters(count, '.', upper-alpha) ') '; } li::before { content: counters(count, ".", decimal-leading-zero) " == " counters(count, ".", lower-alpha); } result specifications specification status comment css lists module level 3the definition of 'css counters' in that specification.

Challenge solutions - Developer guides
solution add this rule to your stylesheet: p:before{ content: url("yellow-pin.png"); } lists lower roman numerals challenge add a rule to your stylesheet, to number the oceans using roman numerals from i to v.
... solution add a rule to the body element (parent of the headings) to reset a new counter, and one to display and increment the counter on the headings: /* numbered headings */ body {counter-reset: headnum;} h3:before { content: "(" counter(headnum, upper-latin) ") "; counter-increment: headnum; } boxes ocean border challenge add one rule to your stylesheet, making a wide border all around the oceans in a color that reminds you of the sea.
... solution the following rule achieves this effect: ul { border: 10px solid lightblue; width: 100px; } layout default image position fixed image position challenge change your sample document, doc2.html, adding this tag to it near the end, just before </body>: <img id="fixed-pin" src="yellow-pin.png" alt="yellow map pin"> predict where the image will appear in your document.

HTML attribute: rel - HTML: Hypertext Markup Language
the shortcut link type is often seen before icon, but this link type is non-conforming, ignored and web authors must not use it anymore.
... the shortcut link type is often seen before icon, but this link type is non-conforming, ignored and web authors must not use it anymore.
...modulepreload links can ensure network fetching is done with the module ready (but not evaluated) in the module map before it is necessarily needed.

<input type="datetime-local"> - HTML: Hypertext Markup Language
some browsers may resort to a text-only input element that validates that the results are legitimate date/time values before letting them be delivered to the server, as well, but you shouldn't rely on this behavior since you can't easily predict it.
...after the year 10,000, those numbers will just be a little bit bigger than before, so many servers will not see issues with forms submitted after the year 10,000.
...f(dayselect.value === "") { dayselect.value = previousday - 1; } if(dayselect.value === "") { dayselect.value = previousday - 2; } if(dayselect.value === "") { dayselect.value = previousday - 3; } } } function populateyears() { // get this year as a number var date = new date(); var year = date.getfullyear(); // make this year, and the 100 years before it available in the year <select> for(var i = 0; i <= 100; i++) { var option = document.createelement('option'); option.textcontent = year-i; yearselect.appendchild(option); } } function populatehours() { // populate the hours <select> with the 24 hours of the day for(var i = 0; i <= 23; i++) { var option = document.createelement('option'); option.textcontent = (i < 1...

<input type="image"> - HTML: Hypertext Markup Language
ription alt alternate string to display when the image can't be shown formaction the url to which to submit the data formenctype the encoding method to use when submitting the form data formmethod the http method to use when submitting the form formnovalidate a boolean which, if present, indicates that the form shouldn't be validated before submission formtarget a string indicating a browsing context from where to load the results of submitting the form height the height, in css pixels, at which to draw the image src the url from which to load the image width the width, in css pixels, at which to draw the image alt the alt attribute provides an alternate string to use as the bu...
... formnovalidate a boolean attribute which, if present, specifies that the form should not be validated before submission to the server.
... examples a login form the following example shows the same button as before, but included in the context of a typical login form.

<source>: The Media or Image Source element - HTML: Hypertext Markup Language
permitted parents a media element—<audio> or <video>—and it must be placed before any flow content or <track> element.
... a <picture> element, and it must be placed before the <img> element.
...this information is used by the browser to determine, before laying the page out, which image defined in srcset to use.

<textarea> - HTML: Hypertext Markup Language
required this attribute specifies that the user must fill in a value before submitting a form.
...roperasafariandroid webviewchrome for androidfirefox for androidopera for androidsafari on iossamsung internettextareachrome full support yesedge full support 12firefox full support yesnotes full support yesnotes notes before firefox 6, when a <textarea> was focused, the insertion point was placed at the end of the text by default.
... yessafari full support yeswebview android full support yeschrome android full support yesfirefox android full support yesnotes full support yesnotes notes before firefox 6, when a <textarea> was focused, the insertion point was placed at the end of the text by default.

Link types - HTML: Hypertext Markup Language
<link> <a>, <area>, <form> dns-prefetch hints to the browser that a resource is needed, allowing the browser to do a dns lookup and protocol handshaking before a user clicks the link.
... the shortcut link type is often seen before icon, but this link type is non-conforming, ignored and web authors must not use it anymore.
... (in firefox, before firefox 37, this worked only in links found in pages.

Using the application cache - HTML: Hypertext Markup Language
whitespace is allowed before and after the uri or iri on each line.
...since a cache manifest file may have been updated before a script attaches event listeners to test for updates, scripts should always test window.applicationcache.status.
...you must update the cache manifest file itself before the browser retrieves and uses the updated files.

Browser detection using the user agent - HTTP
considerations before using browser detection when considering using the user agent string to detect which browser is being used, your first step is to try to avoid it if possible.
...the agent might be an older version of chrome, from before support was added, or (because the feature was experimental at the time) it could be a later version of chrome that removed it.
...if there is a lot calculated by this layout function before it determines the new layout of the page, then consider debouncing the event listener such that it is not called as often.

HTTP caching - HTTP
cache-control: no-store cache but revalidate a cache will send the request to the origin server for validation before releasing a cached copy.
... cache-control: max-age=31536000 validation when using the "must-revalidate" directive, the cache must verify the status of the stale resources before using it and expired ones should not be used.
...before this expiration time, the resource is fresh; after the expiration time, the resource is stale.

Retry-After - HTTP
the retry-after response http header indicates how long the user agent should wait before making a follow-up request.
... when sent with a 429 (too many requests) response, this indicates how long to wait before making a new request.
... when sent with a redirect response, such as 301 (moved permanently), this indicates the minimum time that the user agent is asked to wait before issuing the redirected request.

HTTP Index - HTTP
176 retry-after http, reference, response, response header, header the retry-after response http header indicates how long the user agent should wait before making a follow-up request.
...such a request can be done before deciding to download a large resource to save bandwidth, for example.
...the new resource is effectively created before this response is sent back and the new resource is returned in the body of the message, its location being either the url of the request, or the content of the location header.