Advanced Example - XSLT: Extensible Stylesheet Language Transformations
advanced example this advanced example sorts several divs based on their content.
... the example allows sorting the content multiple times, alternating between ascending and descending order.
... once the transformation is complete, the result is appended to the document, as shown in this example.
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Basic Example - XSLT: Extensible Stylesheet Language Transformations
basic example the basic example will load an xml file and apply a xsl transformation on it.
... these are the same files used in the generating html example in the xslt in netscape gecko article.
...ny"> :: <b> <xsl:value-of select="@company" /> </b> </xsl:if> <br /> </xsl:template> <xsl:template match="myns:body"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> <xsl:template match="@*|node()"> <xsl:copy> <xsl:apply-templates select="@*|node()"/> </xsl:copy> </xsl:template> </xsl:stylesheet> the example loads using synchronous xmlhttprequest both the .xsl (xslstylesheet) and the .xml (xmldoc) files into memory.
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XBL Example - Archive of obsolete content
« previousnext » this section will describe an example xbl element.
... a slideshow element let's construct a full example of an xbl element.
... example 1 : source <binding id="slideshow"> <content> <xul:vbox flex="1"> <xul:deck xbl:inherits="selectedindex" selectedindex="0" flex="1"> <children/> </xul:deck> <xul:hbox> <xul:button xbl:inherits="label=previoustext"/> <xul:label flex="1"/> <xul:button xbl:inherits="label=nexttext"/> </xul:hbox> </xul:vbox> </content> </binding> ...
... the final code the final code is as follows: example 2 : source <binding id="slideshow"> <content> <xul:vbox flex="1"> <xul:deck xbl:inherits="selectedindex" selectedindex="0" flex="1"> <children/> </xul:deck> <xul:hbox> <xul:button xbl:inherits="label=previoustext" oncommand="parentnode.parentnode.parentnode.page--;"/> <xul:description flex="1"/> <xul:button xbl:inherits=...

Example and tutorial: Simple synth keyboard - Web APIs
this example makes use of the following web api interfaces: audiocontext, oscillatornode, periodicwave, and gainnode.
... because oscillatornode is based on audioscheduledsourcenode, this is to some extent an example for that as well.
... the values in the example table above have been rounded to two decimal places.
...we skip these, because we're leaving out the sharp notes in this example.

Stacking context example 1 - CSS: Cascading Style Sheets
« css « understanding css z-index stacking context example 1 let's start with a basic example.
... in this last example you can see that div #2 and div #4 are not siblings, because they belong to different parents in the html elements' hierarchy.
...and this example shows what happens when a parent element does not create a stacking context.
... example html <div id="div1"> <br /><span class="bold">div #1</span> <br />position: relative; <div id="div2"> <br /><span class="bold">div #2</span> <br />position: absolute; <br />z-index: 1; </div> </div> <br /> <div id="div3"> <br /><span class="bold">div #3</span> <br />position: relative; <div id="div4"> <br /><span class="bold">div #4</span> <br />position: absolute; <br />z-index: 2; </div> </div> </body></html> css .bold { font-weight: bold; font: 12px arial; } #div1, #div3 { height: 80px; position: relative; border: 1px dashed #669966; background-color: #ccffcc; padding-left: 5px; } #div2 { opacity: 0.8; z-index: 1; position: absolute; width: 150px; height: 200px; top: 20px; left: 170px; b...

Reddit Example - Archive of obsolete content
this example uses the action button api, which is only available from firefox 29 onwards.
... this example add-on creates a panel containing the mobile version of reddit.
... to run this example you'll also have to have an icon file named "icon-16.png" saved in your add-on's "data" directory.

XForms Custom Controls Examples - Archive of obsolete content
custom control examples.
... please feel free to add your own examples.
... a full example showing a complete form can be found on xforms:custom_controls.

Gloda examples
this content covers features introduced in thunderbird 3 this page provides some examples for using gloda.
... see creating a gloda message query for more examples.
... this requires two chained asynchronous calls: //first take an email address and turn it into an identity object id_q = gloda.newquery(gloda.noun_identity); id_q.kind("email"); id_q.value("test@example.com"); id_coll = id_q.getcollection({ onitemsadded: function _onitemsadded(aitems, acollection) { }, onitemsmodified: function _onitemsmodified(aitems, acollection) { }, onitemsremoved: function _onitemsremoved(aitems, acollection) { }, onquerycompleted: function _onquerycompleted(id_co...

Ajax navigation example - Web APIs
this is an example of an ajax website composed only of three pages (first_page.php, second_page.php and third_page.php).
... to see how it works, please create the following files (or git clone https://github.com/giabao/mdn-ajax-nav-example.git ): note: for fully integrating the <form> elements within this mechanism, please take a look at the paragraph submitting forms and uploading files.
...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/javascript" src="js/ajax_nav.js"></script> <link rel="stylesheet" href="css/style.css...

Stacking context example 2 - CSS: Cascading Style Sheets
« css « understanding css z-index stacking context example 2 this is a very simple example, but it is the key for understanding the concept of stacking context.
... there are the same four divs of the previous example, but now z-index properties are assigned on both levels of the hierarchy.
... example source code <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html> <head><style type="text/css"> div { font: 12px arial; } span.bold { font-weight: bold; } #div2 { z-index: 2; } #div3 { z-index: 1; } #div4 { z-index: 10; } #div1,#div3 { height: 80px; position: relative; border: 1px dashed #669966; backgroun...

Stacking context example 3 - CSS: Cascading Style Sheets
« css « understanding css z-index stacking context example 3 this last example shows problems that arise when mixing several positioned elements in a multi-level html hierarchy and when z-indexes are assigned using class selectors.
... let's take as an example a three-level hierarchical menu made from several positioned divs.
... example source code <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html> <head><style type="text/css"> div { font: 12px arial; } span.bold { font-weight: bold; } div.lev1 { width: 250px; height: 70px; position: relative; border: 2px outset #669966; background-color: #ccffcc; padding-left: 5px; } #container1...

Example - SVG: Scalable Vector Graphics
in this example, we use xhtml, svg, javascript, and the dom to animate a swarm of "motes".
...this example should work in firefox 1.5 and above.
... view the example <?xml version='1.0'?> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:svg="http://www.w3.org/2000/svg"> <head> <title>a swarm of motes</title> <style type='text/css'> <![cdata[ label, input { width: 150px; display: block; float: left; margin-bottom: 10px; } label { text-align: right; width: 75px; padding-right: 20px; } br { clear: left; } ]]> </style> </head> <body onload='update()'> <svg:svg id='display' width='400' height='300'> <svg:circle id='cursor' cx='200' cy='150' r='7' fill='#0000ff' fill-opacity='0.5'/> </svg:svg> <p>a swarm of motes, governed by two simple principles.

Drag and Drop Example - Archive of obsolete content
an example of implementing drag and drop will be implemented in this section.
...this example is fairly simple.

Example Sticky Notes - Archive of obsolete content
view this example <!doctype html public "-//w3c//dtd html 4.01//en" "http://www.w3.org/tr/html401/strict.dtd"> <html> <head> <title>xbl demo : sticky notes</title> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> <style type="text/css"> body { background-color: #ffffff; color: #000000; font: 1em verdana, sans-serif; } h1 { font-size: 1.5em; } /* binding: */ .sticker { -moz-binding: url(notes.xml#default); } </style> </head> <body> <h1><a href="http://developer.mozilla.org/en/docs/xbl:xbl_1.0_reference">xbl</a> demo : sticky notes</h1> <div class="sticker"><p>acme,&nbsp;inc.
...his.$bg; ]]></handler> </handlers> </binding> </bindings> notes.css .sticker { position: relative; left: 0px; right: 0px; float: left; clear: none; width: 10em; height: 10em; overflow: visible; margin: 1em 1em; padding: 0.5em 0.5em; border: 2px solid blue; background-color: yellow; font: 1em normal "times new roman",serif; font-style: italic; cursor: default; } view this example ...

Examples - Archive of obsolete content
examples trigger scripts and install scripts describes typical kinds of script that use the xpinstall api.
... the following samples demonstrate some of the principal installation functions in the xpinstall api: file.macalias file.windowsshortcut [install.]adddirectory [install.]addfile installtrigger.installchrome installtrigger.startsoftwareupdate windows install example ...

Activity Manager examples
(this example seems to be outdated and not working, see bug 557467 comment 1.) //optional: define some convenience constants const nsactprocess = components.constructor("@mozilla.org/activity-process;1", "nsiactivityprocess", "init"); const nsactevent = components.constructor("@mozilla.org/activity-event;1", "nsiactivityevent"...
...} sendercontextdisplayhelper.prototype = { getcontextdisplaytext: function(contexttype, contextobj) { // in this particular example we know that contexttype is "sender" // since we also pass the contexttype along with the contextobject // in some cases, one helper can be registered for a group of context types // we know that the context object is the author of the message // localization is omitted return "messages coming from " + contextobj.surname + ", " + contextobj.firstname; } } // step 2: register the helper for this context type gactivitymanager.registercontextdisplayhelpe...

Compositing example - Web APIs
the output looks like this: compositing example this code sets up the global values used by the rest of the program.
...uma and hue of the bottom layer, while adopting the chroma of the top layer.', 'preserves the luma of the bottom layer, while adopting the hue and chroma of the top layer.', 'preserves the hue and chroma of the bottom layer, while adopting the luma of the top layer.' ].reverse(); var width = 320; var height = 340; main program when the page loads, this code runs to set up and run the example: window.onload = function() { // lum in srgb var lum = { r: 0.33, g: 0.33, b: 0.33 }; // resize canvas canvas1.width = width; canvas1.height = height; canvas2.width = width; canvas2.height = height; lightmix() colorsphere(); runcomposite(); return; }; and this code, runcomposite(), handles the bulk of the work, relying on ...

A basic 2D WebGL animation example - Web APIs
in this webgl example, we create a canvas and within it render a rotating square using webgl.
... result this is a pretty simple example, since it's just drawing one simple object, but the concepts used here extend to much more complex animations.

Examples - MathML
below you'll find some examples you can look at to help you to understand how to use mathml to display increasingly complex mathematical concepts in web content.
... pythagorean theorem small example showing a proof of the pythagorean theorem.

Examples - Game development
threejs app player a player into which you can load and run three.js examples.

Example 1 - Learn web development
this is the first example of code that explains how to build a custom form widget.

Example 2 - Learn web development
this is the second example that explain how to build custom form widgets.

Example 3 - Learn web development
this is the third example that explain how to build custom form widgets.

Example 4 - Learn web development
this is the fourth example that explain how to build custom form widgets.

Example 5 - Learn web development
this is the last example that explain how to build custom form widgets.

Example - Learn web development
this the example for a basic payment form for the article how to structure an html form.

Example - Learn web development
this is the example code for the article your first html form.

Examples
there are several java test applications checked in to the tree that give examples on how to embed gecko or init xpcom from within java.

Animation inspector example: CSS transitions - Firefox Developer Tools
firefox-logo-animation example animation using css transitions.

Animation inspector example: Web Animations API - Firefox Developer Tools
firefox-logo-animation example animation using the web animations api.

Index - Web APIs
45 aeskeygenparams api, aeskeygenparams, dictionary, reference, web crypto api see the examples for subtlecrypto.generatekey().
...it allows them to react to such a change, for example by changing the color contrast of the user interface (ui) or by changing the exposure necessary to take a picture.
...this stream can be used in a similar way as a mediastream obtained via navigator.getusermedia — it can, for example, be sent to a remote peer using the rtcpeerconnection addstream() method.
...And 474 more matches

Index - Archive of obsolete content
perhaps your target audience is people that are using older hardware, for example, and can't upgrade to the latest and greatest browsers.
...see displaying notifications for an example.
... 20 reddit example advanced, codingscripting, javascript, mobile no summary!
...And 117 more matches

Index
some cryptography uses the same secret key for both encrypting and decrypting, for example password based encryption (pbe).
...a certificate contains lots of other details; for example, it contains a signature by a third party that expresses trust in the ownership relationship for the certificate.
...examples for the database files are key3.db and cert8.db, where the numbers are file version numbers.
...And 94 more matches

SVG documentation index - SVG: Scalable Vector Graphics
7 example svg, xml in this example, we use xhtml, svg, javascript, and the dom to animate a swarm of "motes".
... 11 svg 1.1 support in firefox firefox, svg you can find some basic examples of svg syntax and usage in the w3c svg test suite.
... 14 svg conditional processing attributes intermediate, needsexample, property, reference, svg the svg conditional processing attributes are all the attributes that can be specified on some svg elements to control whether or not the element on which it appears should be rendered.
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Index - MDN Web Docs Glossary: Definitions of Web-related terms
it is usually measured in multiples of bits-per-second (bps), for example megabits-per-second (mbps) or gigabits-per-second (gbps).
...in other programming languages different numeric types can exist, for examples: integers, floats, doubles, or bignums.
...for example, <p> is by default a block-level element, whereas <a> is an inline element — you can put several links next to one another in your html source and they will sit on the same line as one another in the rendered output.
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WebIDL bindings
for example, nsinode::getparentobject returns the node's owner document.
...see audiocontext::wrapobject, for example.
...you can see an example of what the function declarations should look like by running mach webidl-example myinterface.
...And 47 more matches

Index - Learn web development
accessibility, beginner, design, example, intro, mobile, needsactivelearning when you're building a website, one top issue to consider is universal design: accommodating all users regardless of disability, technical constraints, culture, location, and so on.
... beginner, express, flask, learn, node, php, python, django, lamp, server-side, servers throughout most of the learning area, we tell you to just open your examples directly in a browser — this can be done by double clicking the html file, dragging and dropping it into the browser window, or choosing file > open...
... beginner, ftp, github, uploading, webmechanics, hosting, rsync, sftp if you have built a simple web page (see html basics for an example), you will probably want to put it online, on a web server.
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Index
if the component uses only "frozen" xpcom interfaces, there is a good chance the same binary component will work with different versions of gecko (version 1.8 and 1.9, for example).
...this can create a difficult situation for extension developers trying to support multiple gecko versions (firefox 2 and 3, for example).
...here is the interface, and a description of its use.</t> 10 how to pass an xpcom object to a new window needsexample, needshelp if you want to be able to call functions within an xpcom object from a xul window's code, you can do so if you pass the xpcom object as one of the arguments to the window creation method.
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Regular expression syntax cheatsheet - JavaScript
for example, /.y/ matches "my" and "ay", but not "yes", in "yes make my day".
...for example, /\d/ or /[0-9]/ matches "2" in "b2 is the suite number".
...for example, /\d/ or /[^0-9]/ matches "b" in "b2 is the suite number".
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Handling common HTML and CSS problems - Learn web development
for example, you might use a css framework and find that one of the class names it uses clashes with one you've already used for a different purpose.
... or you might find that html generated by some kind of third party api (generating ad banners, for example) includes a class name or id that you are already using for a different purpose.
...for example .audio-player ul a.
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CSS values and units - Learn web development
in the following example we have set the color of our heading using a keyword, and the background using the rgb() function: h1 { color: black; background-color: rgb(197,93,161); } a value in css is a way to define a collection of allowable sub-values.
...for example, if you look at the page for <color> you will see that the browser compatibility section lists different types of color value and support for them.
... let's have a look at some of the types of value and unit you may frequently encounter, with examples so that you can try out different possible values.
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Grammar and types - JavaScript
for example, the word früh (which means "early" in german) could be used as a variable name.
... some examples of legal names are number_hits, temp99, $credit, and _name.
...for example, var x = 42.
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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.
... the initial solution was to add one or more hidden links at the top of the page to link to the navigation (or whatever else), for example: <a href="#hidden" class="hidden">skip to navigation</a> but this is still not very precise, and can only be used when the screenreader is reading from the top of the page.
... as another example, apps started to feature complex controls like date pickers for choosing dates, sliders for choosing values, etc.
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ARIA Test Cases - Accessibility
for more up-to-date examples, see the openajaxalliance aria examples page.
... or copy-paste: http://oaa-accessibility.org/examples/ for each example we test the "expected" results with assistive technologies, for each browser that at supports wai-aria in.
... reference to link example note regarding dojo/dijit test files the main purpose of dojo's dijit test files are for dojo developers to exercise and debug the code.
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JavaScript modules - JavaScript
fast forward a few years and we now have complete applications being run in browsers with a lot of javascript, as well as javascript being used in other contexts (node.js, for example).
...node.js has had this ability for a long time, and there are a number of javascript libraries and frameworks that enable module usage (for example, other commonjs and amd-based module systems like requirejs, and more recently webpack and babel).
... introducing an example to demonstrate usage of modules, we've created a simple set of examples that you can find on github.
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Third-party APIs - Learn web development
one of the most obvious examples is using mapping apis to display custom maps on your pages.
... let's look at a simple mapquest api example, and use it to illustrate how third-party apis differ from browser apis.
... note: you might want to just get all our code examples at once, in which case you can then just search the repo for the example files you need in each section.
...And 29 more matches

Handling common accessibility problems - Learn web development
when we say accessibility in the context of web technology, most people immediately think of making sure websites/apps are usable by people with disabilities, for example: visually impaired people using screen readers or magnification/zoom to access text people with motor function impairments using the keyboard (or other non-mouse features) to activate website functionality.
...some examples might include: users on mobile devices.
...examples of bad and good html: <font size="7">my heading</font> <br><br> this is the first section of my document.
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Handling common JavaScript problems - Learn web development
when developers make use of new/nascent javascript features (for example ecmascript 6 / ecmascript next features, modern web apis...) in their code, and find that such features don't work in older browsers.
...for a light introduction; you should also study examples like this one, which shows a typical pattern of saving a this scope to a separate variable, then using that variable in nested functions so you can be sure you are applying functionality to the correct this scope.
... incorrectly using functions inside loops — for example, in bad-for-loop.html (see source code), we loop through 10 iterations, each time creating a paragraph and adding an onclick event handler to it.
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Getting started with HTML - Learn web development
for example, consider the following line of text: my cat is very grumpy if we wanted the text to stand by itself, we could specify that it is a paragraph by enclosing it in a paragraph (<p>) element: <p>my cat is very grumpy</p> note: tags in html are case-insensitive.
...for example, a <title> tag could be written as <title>, <title>, <title>, <title>, etc., and it will work.
... anatomy of an html element let's further explore our paragraph element from the previous section: the anatomy of our element is: the opening tag: this consists of the name of the element (in this example, p for paragraph), wrapped in opening and closing angle brackets.
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Introduction to events - Learn web development
for example, if the user selects a button on a webpage, you might want to respond to that action by displaying an information box.
...for example, in an airport, when the runway is clear for take off, a signal is communicated to the pilot.
...for example: the user selects a certain element or hovers the cursor over a certain element.
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HTML: A good basis for accessibility - Learn web development
html and accessibility as you learn more about html — read more resources, look at more examples, etc.
...for example, a control button to play a video on your site could be marked up like this: <div>play video</div> but as you'll see in greater detail later on, it makes sense to use the correct element for the job: <button>play video</button> not only do html <button>s have some suitable styling applied by default (which you will probably want to override), they also have built-in keyboard accessibility — u...
... note: it is a good idea to have a screen reader set up on your local computer so that you can do some testing of the examples shown below.
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HTML: A good basis for accessibility - Learn web development
html and accessibility as you learn more about html — read more resources, look at more examples, etc.
...for example, a control button to play a video on your site could be marked up like this: <div>play video</div> but as you'll see in greater detail later on, it makes sense to use the correct element for the job: <button>play video</button> not only do html <button>s have some suitable styling applied by default (which you will probably want to override), they also have built-in keyboard accessibility — u...
... note: it is a good idea to have a screen reader set up on your local computer so that you can do some testing of the examples shown below.
...And 27 more matches

Introduction to CSS layout - Learn web development
let's look at a quick html example: <p>i love my cat.</p> <ul> <li>buy cat food</li> <li>exercise</li> <li>cheer up friend</li> </ul> <p>the end!</p> by default, the browser will display this code as follows: note here how the html is displayed in the exact order in which it appears in the source code, with elements stacked up on top of one another — the first paragraph, followed by the unordered list, followed by t...
... the methods that can change how elements are laid out in css are as follows: the display property — standard values such as block, inline or inline-block can change how elements behave in normal flow, for example making a block-level element behave like an inline element (see types of css boxes for more information).
... we also have entire layout methods that are switched on via specific display values, for example css grid and flexbox, which alter how elements inside the element they are set on are laid out.
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Client-side storage - Learn web development
for example, you could download a batch of music files (perhaps used by a web game or music player application), store them inside a client-side database, and play them as needed.
... use of cache and service workers is an advanced topic, and we won't be covering it in great detail in this article, although we will show a simple example in the offline asset storage section below.
... a more involved example let's apply this new-found knowledge by writing a simple working example to give you an idea of how web storage can be used.
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Index - Archive of obsolete content
it explains the concept of dom documents, demonstrates a few simple examples of using dom calls to perform basic manipulations on a document, and then demonstrates working with anonymous xbl content using mozilla-specific methods.
...a floating panel can be created using the panel element with at least two additional attributes as in the following example: 601 menubuttons xul, xul popup guide menus may be attached to buttons in several ways.
... 892 sorting and filtering a custom tree view this is example code for sorting and filtering a custom tree view, that is, a tree whose values are loaded via javascript.
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Introduction to Public-Key Cryptography - Archive of obsolete content
for example, the digital signature on an email message, combined with the certificate that identifies the sender, provide strong evidence that the person identified by that certificate did indeed send that message.
...for example, a server might require a user to type a name and password before granting access to the server.
...the client asks for the password to this database the first time the client needs to access it during a given session-for example, the first time the user attempts to access an ssl-enabled server that requires certificate-based client authentication.
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Localization content best practices
for example, suppose this string needs to be changed from "event" to "add new event": new-event-header = event add-new-event-header is definitely a better choice for the new string than new-event-header1.
... don't forget to add a localization note when: part of the string is not supposed to be localized (for example, the name of an html attribute in a warning).
...for example: bookmark.
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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.
...consider these examples: w = z = x = y is equivalent to w = (z = (x = y)) or x = y; z = y; w = y z += x *= y is equivalent to z += (x *= y) or tmp = x * y; x *= y; z += tmp (except without the tmp).
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Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
for each element that i explain in this chapter, i will illustrate it with a source code example.
... you can type these examples up and open them in firefox to see how they behave and appear.
... you can download a file with all the source code examples from: fixme: attache the translated tarball - paul task !.
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Making decisions in your code — conditionals - Learn web development
for example, in a game, if the player's number of lives is 0, then it's game over.
... human beings (and other animals) make decisions all the time that affect their lives, from small ("should i eat one cookie or two?") to large ("should i stay in my home country and work on my father's farm, or should i move to america and study astrophysics?") conditional statements allow us to represent such decision making in javascript, from the choice that must be made (for example, "one cookie or two"), to the resulting outcome of those choices (perhaps the outcome of "ate one cookie" might be "still felt hungry", and the outcome of "ate two cookies" might be "felt full, but mom scolded me for eating all the cookies".) if...else statements let's look at by far the most common type of conditional statement you'll use in javascript — the humble if...else statement.
... a real example to understand this syntax better, let's consider a real example.
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Drawing graphics - Learn web development
the below example shows a simple 2d canvas-based bouncing balls animation that we originally met in our introducing javascript objects module: around 2006–2007, mozilla started work on an experimental 3d canvas implementation.
...webgl allows you to create real 3d graphics inside your web browser; the below example shows a simple rotating webgl cube: this article will focus mainly on 2d canvas, as raw webgl code is very complex.
...in a real example you'd want to relate the fallback content to the canvas content.
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Proxy Auto-Configuration (PAC) file - HTTP
examples proxy w3proxy.netscape.com:8080; proxy mozilla.netscape.com:8081 primary proxy is w3proxy:8080; if that goes down start using mozilla:8081 until the primary proxy comes up again.
...(in the first example above, netscape will ask user confirmation about making direct connections; in this case, there is no user intervention.) proxy w3proxy.netscape.com:8080; socks socks:1080 use socks if the primary proxy goes down.
... the examples at the end of this document are complete.
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How CSS is structured - Learn web development
you reference an external css stylesheet from an html <link> element: <!doctype html> <html> <head> <meta charset="utf-8"> <title>my css experiment</title> <link rel="stylesheet" href="styles.css"> </head> <body> <h1>hello world!</h1> <p>this is my first css example</p> </body> </html> the css stylesheet file might look like this: h1 { color: blue; background-color: yellow; border: 1px solid black; } p { color: red; } the href attribute of the <link> element needs to reference a file on your file system.
... in the example above, the css file is in the same folder as the html document, but you could place it somewhere else and adjust the path.
... here are three examples: <!-- inside a subdirectory called styles inside the current directory --> <link rel="stylesheet" href="styles/style.css"> <!-- inside a subdirectory called general, which is in a subdirectory called styles, inside the current directory --> <link rel="stylesheet" href="styles/general/style.css"> <!-- go up one directory level, then inside a subdirectory called styles --> <link rel="stylesheet" href="../styles/style.css"> internal stylesheet an internal stylesheet resides within an html document.
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Graceful asynchronous programming with Promises - Learn web development
code similar to this, but much more complete, is used in that example.
... explaining basic promise syntax: a real example promises are important to understand because most modern web apis use them for functions that perform potentially lengthy tasks.
...later on in the chapter, we'll look at how to write your own promise, but for now, we'll look at some simple examples that you'll encounter in web apis.
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NSS tools : certutil
some smart cards (for example, the litronic card) do not let you remove a public key you have generated.
...some smart cards (for example, the litronic card) can store only one key pair.
... · oid (example): 1.2.3.4 · critical-flag: critical or not-critical · filename: full path to a file containing an encoded extension -f password-file specify a file that will automatically supply the password to include in a certificate or to access a certificate database.
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Cross-Origin Resource Sharing (CORS) - HTTP
an example of a cross-origin request: the front-end javascript code served from https://domain-a.com uses xmlhttprequest to make a request for https://domain-b.com/data.json.
...for example, xmlhttprequest and the fetch api follow the same-origin policy.
... examples of access control scenarios we present three scenarios that demonstrate how cross-origin resource sharing works.
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Browser Detection and Cross Browser Support - Archive of obsolete content
an example of this approach involved testing for the existence of the document.images object.
... the classic example of this vendor/version client side detection strategy can be found in the ultimate browser sniffer.
...consider the following example: // wrong approach - do not use!
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Client-side form validation - Learn web development
this article leads you through basic concepts and examples of client-side form validation.
... built-in form validation examples in this section, we'll test out some of the attributes that we discussed above.
... simple start file let's start with a simple example: an input that allows you to choose whether you prefer a banana or a cherry.
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Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
in the following example, 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.
...universe!'); } let mygreeting = settimeout(sayhi, 2000); that can be useful if you have a function that needs to be called both from a timeout and in response to an event, for example.
... for example, you could refactor the previous function so that it will say hi to whatever person's name is passed to it: function sayhi(who) { alert(`hello ${who}!`); } now, you can pass the name of the person into the settimeout() call as a third parameter: let mygreeting = settimeout(sayhi, 2000, 'mr.
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Mozilla DOM Hacking Guide
a function for example can be represented by a jsfunction, a jsobject, a jsval, ...
...for example, when we ask for |document.getelementbyid("myid");|, xpconnect will find that |document| is a property of the window object, so it will look on the interface nsidomwindow, and it will find the getdocument() method.
...i'll take two very different examples.
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certutil
some smart cards (for example, the litronic card) do not let you remove a public key you have generated.
...some smart cards (for example, the litronic card) can store only one key pair.
...for example: -t "tcu,cu,tuw" use the -l option to see a list of the current certificates and trust attributes in a certificate database.
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Web Video Text Tracks Format (WebVTT) - Web APIs
example 1 - simplest possible webvtt file webvtt example 2 - very simple webvtt file with a text header webvtt - this file has no cues.
... example 3 - common webvtt example with a header and cues webvtt - this file has cues.
... inner structure of a webvtt file let's re-examine one of our previous examples, and look at the cue structure in a bit more detail.
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Install Manifests - Archive of obsolete content
id the id of the extension, which must be one of the following: guid (firefox 1.0) a string formatted like so: extensionname@example.org the latter format is significantly easier to generate and manipulate.
... examples <em:id>extensionname@example.org</em:id> <em:id>{daf44bf7-a45e-4450-979c-91cf07434c3d}</em:id> name the name of the add-on; intended for display in the ui.
... examples <em:name>my extension</em:name> targetapplication an object specifying an application targeted by this add-on.
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Templates - Archive of obsolete content
for example, if you are using a tree, you should place the template element inside a tree element.
... simple template example this is better explained with an example.
... let's take a simple example where we want to create a button for each top-level bookmark.
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UI pseudo-classes - Learn web development
this included some usage of pseudo-classes, for example using :checked to target a checkbox only when it is selected.
...for example: <form> <fieldset> <legend>feedback form</legend> <div> <label for="fname">first name: </label> <input id="fname" name="fname" type="text" required> </div> <div> <label for="lname">last name: </label> <input id="lname" name="lname" type="text" required> </div> <div> <label for="email">email address (include if you want a response): </label>...
...for example, if we apply the following css to the above html: input:required { border: 1px solid black; } input:optional { border: 1px solid silver; } the required controls would have a black border, and the optional control will have a silver border, like so: you can also try submitting the form without filling it in, to see the client-side validation error messages browsers give you by default.
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What is JavaScript? - Learn web development
html is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page.
... css is a language of style rules that we use to apply styling to our html content, for example setting background colors and fonts, and laying out our content in multiple columns.
...let's take a simple text label as an example.
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Understanding WebAssembly text format - WebAssembly
note: this is potentially overkill if you are a web developer who just wants to load a wasm module into a page and use it in your code (see using the webassembly javascript api), but it is more useful if for example, you want to write wasm modules to optimize the performance of your javascript library, or build your own webassembly compiler.
...) after the signature, locals are listed with their type, for example (local i32).
... for example, local.get is defined to push the value of the local it read onto the stack, and i32.add pops two i32 values (it implicitly grabs the previous two values pushed onto the stack), computes their sum (modulo 2^32) and pushes the resulting i32 value.
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StringView - Archive of obsolete content
however, this is slow and error-prone, due to the need for multiple conversions (especially if the binary data is not actually byte-format data, but, for example, 32-bit integers or floats).
... examples var mystringview1 = new stringview("hello world!"); // utf-8 alert(mystringview1) // "hello world!" var mystringview2 = new stringview(mystringview1, "utf-16"); alert(mystringview1.buffer.bytelength); // 12 alert(mystringview2.buffer.bytelength); // 24 stringview constructor's methods makefrombase64() syntax stringview.makefrombase64(base64string[, encoding][, byteoffset][, l...
... examples var mystringview = stringview.makefrombase64("sgvsbg8gd29ybgqh"); alert(mystringview) // "hello world!" this function is useful in order to pass binary data containing strings.
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Beginner's guide to media queries - Learn web development
previous overview: css layout next the css media query gives you a way to apply css only when the browser and device environment matches a rule that you specify, for example "viewport is wider than 480 pixels".
... media queries are a key part of responsive web design, as they allow you to create different layouts depending on the size of the viewport, but they can also be used to detect other things about the environment your site is running on, for example whether the user is using a touchscreen rather than a mouse.
... in this lesson you will first learn about the syntax used in media queries, and then move on to use them in a worked example showing how a simple design might be made responsive.
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Introduction to web APIs - Learn web development
as a real-world example, think about the electricity supply in your house, apartment, or other dwellings.
...for example, the web audio api provides javascript constructs for manipulating audio in the browser — taking an audio track, altering its volume, applying effects to it, etc.
...for example, the twitter api allows you to do things like displaying your latest tweets on your website.
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Creating localizable web applications
note: most of the code snippets used in the examples below come from an early version of the getpersonas.com website.
... see examples of the addons.mozillaorg code at /addons/trunk/site/app/config/language.php and /addons/trunk/site/app/config/language.inc.php.
...http://example.com/foo/bar) or on its end (e.g.
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Applying styles and colors - Web APIs
each of the following examples describe the same color.
... // these all set the fillstyle to 'orange' ctx.fillstyle = 'orange'; ctx.fillstyle = '#ffa500'; ctx.fillstyle = 'rgb(255, 165, 0)'; ctx.fillstyle = 'rgba(255, 165, 0, 1)'; a fillstyle example in this example, we once again use two for loops to draw a grid of rectangles, each in a different color.
...etcontext('2d'); for (var i = 0; i < 6; i++) { for (var j = 0; j < 6; j++) { ctx.fillstyle = 'rgb(' + math.floor(255 - 42.5 * i) + ', ' + math.floor(255 - 42.5 * j) + ', 0)'; ctx.fillrect(j * 25, i * 25, 25, 25); } } } <canvas id="canvas" width="150" height="150"></canvas> draw(); the result looks like this: screenshotlive sample a strokestyle example this example is similar to the one above, but uses the strokestyle property to change the colors of the shapes' outlines.
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Basic Concepts of grid layout - CSS: Cascading Style Sheets
css grid layout has the following features: fixed and flexible track sizes you can create a grid with fixed track sizes – using pixels for example.
... in this example, i have a containing div with a class of wrapper and, inside are five child elements.
...if you view this example in firefox and inspect the grid, you will see a small icon next to the value grid.
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Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
as a result, mozilla is not fully backwards-compatible with netscape navigator 4.x and microsoft internet explorer legacy code; for example, mozilla does not support <layer> as i will discuss later.
...for example, rather than: if (ismozilla || isie5) you would use: if (document.getelementbyid) this would allow other browsers that support that w3c standard method, such as opera or safari, to work without any changes.
...conditionistrue : conditionisfalse; for example, to retrieve an element, you would use: function getelement(aid){ return (document.getelementbyid) ?
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Legacy layout methods - Learn web development
a two column layout let's start with the simplest possible example — a two column layout.
...at the bottom of the section you can see a live example of what the final code should look like.
...replace whatever is inside the body currently with the following: <h1>2 column layout example</h1> <div> <h2>first column</h2> <p> lorem ipsum dolor sit amet, consectetur adipiscing elit.
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How to build custom form controls - Learn web development
for example, if you need to perform advanced styling on some controls such as the <select> element or if you want to provide custom behaviors, you may consider building your own controls.
...to that end, we will work with an example: rebuilding the <select> element.
... in our example, we will rebuild the <select> element.
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Command line crash course - Learn web development
it is also useful for automation — for example to write a command to update the titles of hundreds of files instantly, say from “ch01-xxxx.png” to “ch02-xxxx.png”.
...ve around your directory structure: cd create directories: mkdir create files (and modify their metadata): touch copy files: cp move files: mv delete files or directories: rm download files found at specific urls: curl search for fragments of text inside larger bodies of text: grep view a file's contents page by page: less, cat manipulate and transform streams of text (for example changing all the instances of <div>s in an html file to <article>): awk, tr, sed note: there are a number of good tutorials on the web that go much deeper into the command line on the web — this is only a brief introduction!
...for example, after typing the above two commands, try typing cd d and pressing tab — it should autocomplete the directory name desktop for you, provided it is present in the current directory.
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Drag Operations - Web APIs
here is an example which allows a section of content to be dragged.
... starting a drag operation in this example, a listener is added for the dragstart event by using the ondragstart attribute.
... in this example the dragstart listener is added to the draggable element itself.
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Document Object Model - Archive of obsolete content
for example, if the global object has a 'name' property, you can change the name with the code 'name = 7', without having to specify any object to use.
...for example, the following two lines which open a new window are functionally equivalent: window.open("test.xul","_new"); open("test.xul","_new"); when you declare a function or a variable at the top level of a script, that is outside another function, you are actually declaring a property of the global object.
...for example, the following code will display the text 'message' in an alert twice.
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LiveConnect Overview - Archive of obsolete content
for example, you can create a java string object and assign it to the javascript variable mystring by using the new operator with the java constructor, as follows: var mystring = new java.lang.string("hello world"); in the previous example, the variable mystring is a javaobject because it holds an instance of the java object string.
...for example, suppose the redwood corporation uses a java package called redwood to contain various java classes that it implements.
...for example, if the helloworld class is directly in the classpath and not in a package, you can access it as follows: var red = new packages.helloworld(); the liveconnect java, sun, and netscape objects provide shortcuts for commonly used java packages.
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CSS and JavaScript accessibility best practices - Learn web development
as an example, a screen reader user can't navigate a page via heading elements if the developer hasn't appropriately used heading elements to markup the content.
... form elements elements to allow users to input data into websites: <div> <label for="name">enter your name</label> <input type="text" id="name" name="name"> </div> you can see some good example css in our form-css.html example (see it live also).
... you can see a good, simple example of table html and css in our table-css.html example (see it live also).
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Fundamental text and font styling - Learn web development
text layout styles: properties that affect the spacing and other layout features of the text, allowing manipulation of, for example, the space between lines and letters, and how the text is aligned within the content box.
...in this example we'll apply some different css properties to the same html sample, which looks like this: <h1>tommy the cat</h1> <p>well i remember it as though it were a meal ago...</p> <p>said tommy the cat as he reeled back to clear whatever foreign matter may have nestled its way into his mighty throat.
...but it was a rare occasion such as this that he did.</p> you can find the finished example on github (see also the source code.) color the color property sets the color of the foreground content of the selected elements (which is usually the text, but can also include a couple of other things, such as an underline or overline placed on text using the text-decoration property).
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Client-Server Overview - Learn web development
a method that defines the required action (for example, to get a file or to save or update some data).
...you might for example use a head request to find out the last time a resource was updated, and then only use the (more "expensive") get request to download the resource if it has changed.
... additional information can be encoded with the request (for example, html form data).
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NSS API Guidelines
for example, pkcs #7 is used to encrypt certificate data to exchange between applications, or to encrypt s/mime message data.
... here is an example from lib/base/baset.h: #ifdef debug static const char baset_cvs_id[] = "@(#) $rcsfile: nss-guidelines.html, v $ $revision: 48936 $ $date: 2009-08-11 07:45:57 -0700 (tue, 11 aug 2009) $ $name$"; #endif /* debug */ the difference, between this and id, is that id has some useless information (every file is "experimental"), and doesn't have name.
...for example: layer_capitalizedenglishwords() or cert_destroycertificate().
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Plug-in Basics - Plugins
if you are browsing a page that has several embedded realaudio clips, for example, the browser will create as many instances of the realplayer plug-in as are needed (though of course playing several realaudio files at the same time would seldom be a good idea).
...for example: #!/bin/bash export moz_plugin_path=/usr/lib64/mozilla/plugins exec /usr/lib64/firefox/firefox profile directory/plugins, where profile directory is the directory of the current user profile.
... advanced: you can determine which directories a gecko program checks with the linux strace command, for example: strace -e open /usr/bin/firefox 2>&1 | grep plugin but with version firefox-41.0.2 we can not check.
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Inputs and input sources - Web APIs
the fundamental capabilities of an input source are: targeting monitoring directional controls (either a motion-sensing pointer or a joystick or trackpad, for example) to aim in a direction, possibly at a target, though targeting is left to you to implement yourself.
...it can also be useful if your app uses the notion of "main hand" and "off hand" for determining the functionality of a controller; in a game, for example, the main hand controller may be the player's weapon while the off hand controller might be used to control the positioning of a shield.
...this space's native origin is located at the point from which the target ray is emitted (such as the front tip of the controller, or the end of a gun barrel if the controller is being rendered as a gun, for example), and the space's orientation vector extends outward along the path of the target ray.
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Element Positioning - Archive of obsolete content
for example, the position of a button in a horizontal box is to the right of the previous button, if any.
...for example, a button's width is determined by the amount of text inside the button.
...an example is shown below: example 1: source view <button label="ok" width="100" height="40"/> however, it is not recommended that you do this.
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Manipulating documents - Learn web development
using methods available on this object you can do things like return the window's size (see window.innerwidth and window.innerheight), manipulate the document loaded into that window, store data specific to that document on the client-side (for example using a local database or other storage mechanism), attach an event handler to the current window, and more.
...you can use this object to return and manipulate information on the html and css that comprises the document, for example get a reference to an element in the dom, change its text content, apply new styles to it, create new elements and add them to the current element as children, or even delete it altogether.
...this is a "tree structure" representation created by the browser that enables the html structure to be easily accessed by programming languages — for example the browser itself uses it to apply styling and other information to the correct elements as it renders a page, and developers like you can manipulate the dom with javascript after the page has been rendered.
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Aprender y obtener ayuda - Learn web development
like most of this course, for example.
...codecademy for example is a learning site where the tutorials mainly consist of interactive code editors where you have to directly write code and see if the desired result was achieved.
... many mdn web docs reference pages provide interactive examples too, where you can alter the code and see how the live result changes.
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Storage access policy: Block cookies from trackers
consider the following examples: hostname on the list hostname of resource matched example.com example.com yes example.com a.b.example.com yes blah.example.com example.com no a.b.example.com c.d.example.com no blah.example.com foo.blah.example.com yes what does the storage access policy block?
...for example, a request for content from tracker.example on news.example will not reuse an http connection with a request for content from tracker.example on shopping.example or with requests that occur when tracker.example is visited directly (i.e., as a first party).
...as an example, if a resource from tracker.example is granted storage access on foo.example.com, then tracker.example will be able to access its cookies on bar.foo.example.com but not example.com.
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OS.File for the main thread
example: read the contents of a file as text the following snippet opens a file "file.txt" and read its contents as a string, using the default encoding (utf-8).
... let decoder = new textdecoder(); // this decoder can be reused for several reads let promise = os.file.read("file.txt"); // read the complete file as an array promise = promise.then( function onsuccess(array) { return decoder.decode(array); // convert this array to a text } ); this example requires firefox 18 or a more recent version.
... example: write a string to a file the following snippet writes the text "this is some text" to a string "file.txt", using the default encoding (utf-8).
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JSAPI User Guide
each time the application runs a js script (using, for example, js_evaluatescript), it provides the global object for that script to use.
... a minimal example each of the three key elements described in the previous section requires a few jsapi calls: the runtime: use js_newruntime to create it and js_destroyruntime to clean it up when you're done.
...the example below defines a very basic jsclass (named global_class) with no methods or properties of its own.
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Secure Development Guidelines
introduction provide developers with information on specific security issues cover common coding mistakes and how they affect a product how to avoid making them how to mitigate them everything is oriented toward c/c++ introduction: gaining control specifics about the underlying architecture, using x86 as an example 6 basic registers (eax, ebx, ecx, edx, edi, esi) 2 stack-related registers (esp, ebp) mark top and bottom of current stack frame status register (eflags) contains various state information instruction pointer (eip) points to register being executed; can’t be modified directly introduction: gaining control (2) eip is modified using call or jump instructi...
...memory saved return addr or function pointer get altered introduction: gaining control (3) common issues used to gain control buffer overflows format string bugs integer overflows/underflows writing secure code: input validation input validation most vulnerabilities are a result of un-validated input always perform input validation could save you without knowing it examples: if it doesn’t have to be negative, store it in an unsigned int if the input doesn’t have to be > 512, cut it off there if the input should only be [a-za-z0-9], enforce it cross site scripting (xss) xss is a type of code injection attack typically occurs in web applications injection of arbitrary data into an html document from another site victim’s browser execute...
... xss: example the following snippet of javascript: document.write("welcome to " + document.location); ...
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XPCOM array guide
for example: // handlelist cannot modify the array because of const void handlelist(const nstarray<t>&); in-place enumeration most of the arrays presented here provide callback-style means to enumerate members of an array.
...for example, you should not delete elements of an array during the enumeration as this will often confuse the loop which is enumerating the array.
... example: an array attribute in an idl file would be nsiarray.
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Index
3 account examples extensions, thunderbird this article provides examples on accessing and manipulating thunderbird accounts.
...see account examples for examples and code snippets.
...the functionality of the component is described on the activity manager page, and the activity manager examples page has code snippets.
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font-family - CSS: Cascading Style Sheets
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... the example below lists two font families, the first with a <family-name> and the second with a <generic-name>: font-family: gill sans extrabold, sans-serif; values <family-name> the name of a font family.
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Functions - JavaScript
for example, the following code defines a simple function named square: function square(number) { return number * number; } the function square takes one parameter, called number.
...a non-primitive value, such as array or a user-defined object) as a parameter and the function changes the object's properties, that change is visible outside the function, as shown in the following example: function myfunc(theobject) { theobject.make = 'toyota'; } var mycar = {make: 'honda', model: 'accord', year: 1998}; var x, y; x = mycar.make; // x gets the value "honda" myfunc(mycar); y = mycar.make; // y gets the value "toyota" // (the make property was changed by the function) function expressions while the function declaration above is syntactically a statement, func...
...for example, the function square could have been defined as: const square = function(number) { return number * number } var x = square(4) // x gets the value 16 however, a name can be provided with a function expression.
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Tabbed browser - Archive of obsolete content
xul: <menuitem oncommand="myextension.foo(event)" onclick="checkformiddleclick(this, event)" label="click me"/> js: var myextension = { foo: function(event) { openuilink("http://www.example.com", event, false, true); } } opening a url in an on demand tab cu.import("resource://gre/modules/xpcomutils.jsm"); xpcomutils.definelazyservicegetter(this, "gsessionstore", "@mozilla.org/browser/sessionstore;1", "nsisessionstore"); // create new tab, but don't load the content.
... reusing by url/uri a common feature found in many extensions is to point the user to chrome:// uris in a browser window (for example, help or about information) or external (on-line http(s)://) html documents when the user clicks an extension's button or link.
... closing a tab this example closes the currently selected tab.
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Object prototypes - Learn web development
let's look at an example to make this a bit clearer.
... understanding prototype objects here we'll go back to the example in which we finished writing our person() constructor — load the example in your browser.
... you can use our oojs-class-further-exercises.html example (see also the source code), if you don't already have it from working through the last article.
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Implementing feature detection - Learn web development
let's recap and look at the example we touched on in our handling common javascript problems — the geolocation api (which exposes available location data for the device the web browser is running on) has the main entry point for its use, a geolocation property available on the global navigator object.
... a classic example might be to test for flexbox support in a browser; for browsers that support the newest flexbox spec, we could use a flexible and robust flex layout.
... we will add the html5 shiv to our example too so that the html5 semantic elements will style properly in older versions of ie.
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An Overview of XPCOM
they are usually contained in reusable binary libraries (a dll on windows, for example, or a dso on unix), which can include one or more components.
...the network library, for example, consists of components for each of the protocols, http, ftp, and others, which are bundled together and linked into a single library.
...for example, one author's son will not eat a peanut-butter sandwich if there isn't jam on it, because in his world, peanut butter and jam form an indelible union.
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Signaling and video calling - Web APIs
you can try out this example on glitch, and you can remix the example to experiment with it as well.
... note: if you try out the example on glitch, please note that any changes made to the code will immediately reset any connections.
...we could have made it receive our original message object, but in this example it's more efficient this way.
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Using Web Workers - Web APIs
for example, you can't directly manipulate the dom from inside a worker, or use some default methods and properties of the window object.
...in this section we'll discuss the javascript found in our basic dedicated worker example (run dedicated worker): this allows you to enter two numbers to be multiplied together.
... this example is rather trivial, but we decided to keep it simple while introducing you to basic worker concepts.
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<input>: The Input (Form Input) element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... the available types are as follows: type description basic examples spec button a push button with no default behavior displaying the value of the value attribute, empty by default.
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Menus - Archive of obsolete content
the following is a brief summary of these elements, examples of each will be provided later.
...for example, the file and edit menus along the top of an application window (or the menubar on the top of screen).
...this type of menu would be used when you want to have a set of commands yet don't want to use a menu bar, for example in a dialog box.
...And 16 more matches

Template Logging - Archive of obsolete content
for example, if you spell a value wrong, no data may be returned, but the template system won't know that that this was because of a spelling error, or simply that there shouldn't be any data anyway.
...each result is logged in a form much like the following: in template with id root using ref http://www.some-fictitious-zoo.com/birds new active result for query 2 matching rule 1: http://www.some-fictitious-zoo.com/birds/emperorpenguin in the example above, a new result has been added.
...the example also specifies 'query 2 matching rule 1'.
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Windows Media in Netscape - Archive of obsolete content
this article explains how to embed the windows media player activex control in web pages to support netscape 7.1, how to control the windows media player activex control using javascript and provides working examples.
...example 1: client-side detection scripts browser architecture supports: netscapeplugin windows media player installed: true windows media scriptable: false windows media version: pluginversion a complete source code listing showing how that detection was done can be found here (devedge-temp).
...for example if (window.activexobject) { // internet explorer only script } server-side detection using user-agent strings netscape 7.1's user agent string on windows has the general pattern: mozilla/5.0 (windows; u; <em>operating system version</em>; <em>language</em>; rv:1.4) gecko/20030624 netscape/7.1 (ax<em>[;optional comments]</em>) the "vendor comment" (ax) following the "vendor version" netscap...
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Anatomy of a video game - Game development
your game loop might be similar to the find the differences example and base itself on input events.
...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.
... building a better main loop in javascript there are two obvious issues with our previous main loop: main() pollutes the window object (where all global variables are stored) and the example code did not leave us with a way to stop the loop unless the whole tab is closed or refreshed.
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Backgrounds and borders - Learn web development
in the example below, we have used various color values to add a background color to the box, a heading, and a <span> element.
...in the example below, we have two boxes — one has a background image which is larger than the box, the other has a small image of a star.
... this example demonstrates two things about background images.
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Responsive design - Learn web development
note: see this simple liquid layout: example, source code.
... when viewing the example, drag your browser window in and out to see how this looks at different sizes.
... note: see this simple fixed-width layout: example, source code.
...And 16 more matches

JavaScript basics - Learn web development
example javascript is one of the most popular modern web technologies!
...example.
...is the standard for introductory programming examples.) important: if you haven't been following along with the rest of our course, download this example code and use it as a starting point.
...And 16 more matches

Introducing asynchronous JavaScript - Learn web development
let's look at a simple example (see it live here, and see the source): const btn = document.queryselector('button'); btn.addeventlistener('click', () => { alert('you clicked me!'); let pelem = document.createelement('p'); pelem.textcontent = 'this is a newly-added paragraph.'; document.body.appendchild(pelem); }); in this block, the lines are executed one after the other: we grab a reference to a <button> elemen...
... so in the example above, after you've clicked the button the paragraph won't appear until after the ok button is pressed in the alert box.
...let's look at a quick example.
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Basic math in JavaScript — numbers and operators - Learn web development
we use different terms to describe different types of decimal numbers, for example: integers are whole numbers, e.g.
... floating point numbers (floats) have decimal points and decimal places, for example 12.5, and 56.7786543.
... for example, to round your number to a fixed number of decimal places, use the tofixed() method.
...And 16 more matches

Setting up your own test automation environment - Learn web development
most popular environments have available a package or framework that will install webdriver and the bindings required to communicate with webdriver using this language, for example, java, c#, ruby, python, javascript (node), etc.
...for example, if we were using a mac os x machine, our user name was bob, and we put our drivers in the root of our home folder, the path would be /users/bob.
...for more complete details, you should consult the selenium-webdriver javascript api reference for a detailed reference, and the selenium main documentation's selenium webdriver and webdriver: advanced usage pages, which contain multiple examples to learn from written in different languages.
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Python binding for NSS
examples of this are the various callbacks which can be set and their parameters.
...for example it is already known there are some naming inconsistencies.
... example code the doc/examples directory contains numerous examples of python-nss programs and libraries you may wish to consult.
...And 16 more matches

Starting WebLock
for example, an object may be created and have its observe method called at startup, or it may register to be notified prior to xpcom shutdown.
...for example, in the case of the xpcom shutdown observation, asubject and adata are not defined, and atopic is defined as the string "xpcom-shutdown".
...xxx what is example 2?following example 2, you change the class definition to support the nsiobserver interface and change ns_impl_isupports1 so that the queryinterface implementation knows that the component also supports nsiobserver.
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nsIPromptService
a delay can be useful not only to give the user more time to think before acting, but also as a countermeasure against malicious web sites that intentionally create a race condition whereby the user intends to click or type a key responding, for example, to the web site's prompt but the security dialog pops up unexpectedly and its button is unintentionally activated.
... see also the alert_example.
... see also the alertcheck_example.
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Working with windows in chrome code
it contains tips and example code on opening new windows, finding an already opened window, and passing data between different windows.
... from xpcom components and modules if the window object is unavailable (for example, when opening a window from xpcom component code), you might want to use nsiwindowwatcher interface.
...so, for example, to access the dom document corresponding to the window, you can use win.document.
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Using the CSS Painting API - Web APIs
*/ paint(ctx) { ctx.fillstyle = 'hsla(55, 90%, 60%, 1.0)'; ctx.fillrect(0, 15, 200, 20); /* order: x, y, w, h */ } }); in this class example we have defined a single context option with the contextoptions() function: we returned a simple object stating alpha transparency is allowed.
... we tried to keep the example simple.
... in our example, the paintworklet is stored on github.
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Introduction to the DOM - Web APIs
for example, the standard dom specifies that the getelementsbytagname method in the code below must return a list of all the <p> elements in the document: const paragraphs = document.getelementsbytagname("p"); // paragraphs[0] is the first <p> element // paragraphs[1] is the second <p> element, etc.
... alert(paragraphs[0].nodename); all of the properties, methods, and events available for manipulating and creating web pages are organized into objects (for example, the document object that represents the document itself, the table object that implements the special htmltableelement dom interface for accessing html tables, and so forth).
...for example, the html dom api adds support for representing html documents to the core dom.
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Web Accessibility: Understanding Colors and Luminance - Accessibility
for example, "saturation" is known as "chroma" in some circles.
... for example, the color "crimson red" may be described in hex values as #990000 by some and #dc143c by others.
...webgl is usually in the rgba format; see an example of how it is used in "clearing with colors".
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Reference - Archive of obsolete content
for example, "script" and "program" are synonymous.
...-- dria 04:27, 22 september 2005 (pdt) those examples are not "bad examples" per se.
...i was wondering what should be done about those examples, since they would no longer be valid with fx 1.5+ and family.
...And 15 more matches

Cascade and inheritance - Learn web development
in the below example, we have two rules that could apply to the h1.
... example time!
... for example, if you set a color and font-family on an element, every element inside it will also be styled with that color and font, unless you've applied different color and font values directly to them.
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Floats - Learn web development
but web developers quickly realized that you can float anything, not just images, so the use of float broadened, for example to fun layout effects such as drop-caps.
... a simple float example let's explore how to use floats.
... we'll start with a really simple example involving floating a block of text around an element.
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Positioning - Learn web development
previous overview: css layout next positioning allows you to take elements out of the normal document layout flow, and make them behave differently; for example sitting on top of one another, or always remaining in the same place inside the browser viewport.
... static positioning static positioning is the default that every element gets — it just means "put the element into its normal position in the document layout flow — nothing special to see here." to demonstrate this, and get your example set up for future sections, first add a class of positioned to the second <p> in the html: <p class="positioned"> ...
... note: you can see the example at this point live at 1_static-positioning.html (see source code).
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Creating hyperlinks - Learn web development
for example, the bbc homepage contains a many links that point not only to multiple news stories, but also different areas of the site (navigation functionality), login/registration pages (user tools), and more.
...if a title's information is truly important to the usability of page, then you should present it in a manner that will be accessible to all users, for example by putting it in the regular text.
... active learning: creating your own example link create an html document using your local code editor and our getting started template.
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HTML text fundamentals - Learn web development
implementing structural hierarchy for example, in this story, the <h1> element represents the title of the story, the <h2> elements represent the title of each chapter, and the <h3> elements represent sub-sections of each chapter: <h1>the crushing bore</h1> <p>by chris mills</p> <h2>chapter 1: the dark night</h2> <p>it was a dark night.
... to answer this question, let's take a look at text-start.html—the starting point of our running example for this article (a nice hummus recipe).
... active learning: giving our content structure let's jump straight in with a live example.
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What’s in the head? Metadata in HTML - Learn web development
in the above example, the head is quite small: <head> <meta charset="utf-8"> <title>my test page</title> </head> in larger pages however, the head can get quite full.
... the <h1> element appears on the page when loaded in the browser — generally this should be used once per page, to mark up the title of your page content (the story title, or news headline, or whatever is appropriate to your usage.) the <title> element is metadata that represents the title of the overall html document (not the document's content.) active learning: inspecting a simple example to start off this active learning, we'd like you to go to our github repo and download a copy of our title-example.html page.
...for example, if you try bookmarking the page (bookmarks > bookmark this page or the star icon in the url bar in firefox), you will see the <title> contents filled in as the suggested bookmark name.
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Fetching data from the server - Learn web development
the trouble with this model is that whenever you want to update any part of the page, for example, to display a new set of products or load a new page, you've got to load the entire page again.
...for these examples, we'll request data out of a few different text files and use them to populate a content area.
... to begin this example, make a local copy of ajax-start.html and the four text files — verse1.txt, verse2.txt, verse3.txt, and verse4.txt — in a new directory on your computer.
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NSS tools : modutil
usage and examples creating database files before any operations can be performed, there must be a set of security databases available.
...for the most basic case, simply upload the library: modutil -add modulename -libfile library-file [-ciphers cipher-enable-list] [-mechanisms mechanism-list] for example: modutil -dbdir sql:/home/my/sharednssdb -add "example pkcs #11 module" -libfile "/tmp/crypto.so" -mechanisms rsa:dsa:rc2:random using database directory ...
... module "example pkcs #11 module" added to database.
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Working with data
example: creating an array let arraytype = ctypes.arraytype(ctypes.int32_t); let myarray = new arraytype(5); at this point, myarray.length is 5; there are 5 entries in the array.
... example: creating an array of strings var cstr1 = ctypes.jschar.array()('rawr'); var cstr2 = ctypes.jschar.array()('boo'); var mycarray_ofstrings = ctypes.jschar.ptr.array(2)([cstr1, cstr2]); // specifying length of 2 is optional, can omit it, so can just do `ctypes.jschar.ptr.array()([cstr1, cstr2])` mycarray_ofstrings.addressofelement(0).contents.readstring(); // outputs: "rawr" mycarray_ofstrings.addressofelement(1).contents.readstring(); // outputs: "boo" example: creating an array of integers var jsarr = [4, 10]; var mycarr = ctypes.int.array(jsarr.length)(jsarr); // specifying length is optional, can omit.
... example: cast an array this example shows how to cast an array of a certain type to another type.
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filter - CSS: Cascading Style Sheets
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... filter: blur(5px) <table class="standard-table"> <thead> <tr> <th style="text-align: left;" scope="col">original image</th> <th style="text-align: left;" scope="col">live example</th> <th style="text-align: left;" scope="col">svg equivalent</th> <th style="text-align: left;" scope="col">static example</th> </tr> </thead> <tbody> <tr> <td><img alt="test_form.jpg" id="img1" class="internal default" src="/files/3710/test_form_2.jpg" style="width: 100%;" /></td> <td><img alt="test_form.jpg" id="img2" class="internal default" src="/files/371...
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Content Security Policy (CSP) - HTTP
(sometimes you may see mentions of the x-content-security-policy header, but that's an older version and you don't need to specify it anymore.) alternatively, the <meta> element can be used to configure a policy, for example: <meta http-equiv="content-security-policy" content="default-src 'self'; img-src https://*; child-src 'none';"> threats mitigating cross site scripting a primary goal of csp is to mitigate and report xss attacks.
... mitigating packet sniffing attacks in addition to restricting the domains from which content can be loaded, the server can specify which protocols are allowed to be used; for example (and ideally, from a security standpoint), a server can specify that all content must be loaded using https.
...for example, a page that uploads and displays images could allow images from anywhere, but restrict a form action to a specific endpoint.
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Inner-browsing extending the browser navigation paradigm - Archive of obsolete content
for web developers, for example, it provides less fine-grained control over the experience, and it can strain bandwidth and other resources.
...it also provides two implementation examples using the model.
...the second example shows a tabbed menu that dynamically loads news headlines into the current web page.
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JXON - Archive of obsolete content
there are some cases in which the whole content of an xml document must be read from the javascript interpreter (like for web-apps languages or settings xml documents, for example).
... conversion snippets now imagine you have this sample xml document: example.xml <?xml version="1.0"?> <!doctype catalog system "catalog.dtd"> <catalog> <product description="cardigan sweater"> <catalog_item gender="men's"> <item_number>qwz5671</item_number> <price>39.95</price> <size description="medium"> <color_swatch image="red_cardigan.jpg">red</color_swatch> <color_swatch image="burgundy_cardigan.jpg">burgundy</color_swatch> </...
...dec 25, 1995</discount_until> <price>42.50</price> <size description="medium"> <color_swatch image="black_cardigan.jpg">black</color_swatch> </size> </catalog_item> </product> <script type="text/javascript"><![cdata[function matchwo(a,b) { if (a < b && a < 0) { return 1; } else { return 0; } }]]></script> </catalog> first, create a dom tree like the previous example as described in the how to create a dom tree article.
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RDF in Mozilla FAQ - Archive of obsolete content
some examples of datasources that exist today are "browser bookmarks", "browser global history", "imap mail accounts", "nntp news servers", and "rdf/xml files".
...statements about the same rdf resource can then be intermingled: for example, the "last visit date" of a particular website comes from the "browser global history" datasource, and the "shortcut keyword" that you can type to reach that website comes from the "browser bookmarks" datasource.
... for example, rdf:foo would load: @mozilla.org/rdf/datasource;1?name=foo as with rdf/xml datasources, a datasource that is retrieved this way is "cached" by the rdf service until the last reference is dropped.
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Mobile accessibility - Learn web development
for example: single-tapping an app will select it, and the device will read out what the app is.
... for example, with talkback turned on: open your web browser.
... tap with two fingers to perform a context-relevant action — for example, taking a photo while in the camera app.
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Accessible multimedia - Learn web development
for example: <img src="dinosaur.png" alt="a red tyrannosaurus rex: a two legged dinosaur standing upright like a human, with small arms, and a large head with lots of sharp teeth."> accessible audio and video controls implementing controls for web-based audio/video shouldn't be a problem, right?
...for example (see native-controls.html source code and live): <audio controls> <source src="viper.mp3" type="audio/mp3"> <source src="viper.ogg" type="audio/ogg"> <p>your browser doesn't support html5 audio.
... let's take the video example from above and add custom controls to them.
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Flexbox - Learn web development
introducing a simple example in this article we are going to get you to work through a series of exercises to help you understand how flexbox works.
... the parent element that has display: flex set on it (the <section> in our example) is called the flex container.
... the items being laid out as flexible boxes inside the flex container are called flex items (the <article> elements in our example).
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Advanced form styling - Learn web development
for example, let's take the following controls: <form> <p> <label for="search">search: </label> <input id="search" name="search" type="search"> </p> <p> <label for="text">text: </label> <input id="text" name="text" type="text"> </p> <p> <label for="date">date: </label> <input id="date" name="date" type="datetime-local"> </p> <p> <label for="radio">radio: </label> ...
... the following live example shows you what they look like in your system — default on the left, and with the above css applied on the right (find it here also if you want to test it on other systems).
...the answer is that in chromium-based browsers on macos, search boxes have some styling restrictions — you can't adjust their height or font-size freely, for example.
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Basic native form controls - Learn web development
previous overview: forms next in the previous article, we marked up a functional web form example, introducing some form controls and common structural elements, and focusing on accessibility best practices.
...they are a very convenient way to let the user enter any kind of data, and we've already seen a few simple examples.
...the value text for this attribute is also the fallback value if the value you specify for the type attribute is unknown by the browser (for example if you specify type="color" and the browser doesn't support native color pickers).
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Sending form data - Learn web development
in this example, the data is sent to an absolute url — https://example.com: <form action="https://example.com"> here, we use a relative url — the data is sent to a different url on the same origin: <form action="/somewhere_else"> when specified with no attributes, as below, the <form> data is sent to the same page that the form is present on: <form> note: it's possible to specify a url that uses the h...
...in this case we are passing two pieces of data to the server: say, which has a value of hi to, which has a value of mom the http request looks like this: get /?say=hi&to=mom http/2.0 host: foo.com note: you can find this example on github — see get-method.html (see it live also).
... let's look at an example — this is the same form we looked at in the get section above, but with the method attribute set to post.
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NSS tools : modutil
usage and examples creating database files before any operations can be performed, there must be a set of security databases available.
...for the most basic case, simply upload the library: modutil -add modulename -libfile library-file [-ciphers cipher-enable-list] [-mechanisms mechanism-list] for example: modutil -dbdir sql:/home/my/sharednssdb -add "example pkcs #11 module" -libfile "/tmp/crypto.so" -mechanisms rsa:dsa:rc2:random using database directory ...
... module "example pkcs #11 module" added to database.
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Drawing shapes with canvas - Web APIs
rectangular shape example <html> <body onload="draw();"> <canvas id="canvas" width="150" height="150"></canvas> </body> </html> function draw() { var canvas = document.getelementbyid('canvas'); if (canvas.getcontext) { var ctx = canvas.getcontext('2d'); ctx.fillrect(25, 25, 100, 100); ctx.clearrect(45, 45, 60, 60); ctx.strokerect(50, 50, 50, 50); } } this example's output is shown below.
... drawing a triangle for example, the code for drawing a triangle would look something like this: <html> <body onload="draw();"> <canvas id="canvas" width="100" height="100"></canvas> </body> </html> function draw() { var canvas = document.getelementbyid('canvas'); if (canvas.getcontext) { var ctx = canvas.getcontext('2d'); ctx.beginpath(); ctx.moveto(75, 50); ctx.lineto(100, 75); ctx.lineto(10...
... the example below draws two triangles, one filled and one outlined.
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Using readable streams - Web APIs
finding some examples we will look at various examples in this article, taken from our dom-examples/streams repo.
... you can find the full source code there, as well as links to the examples.
... as our simple stream pump example shows (see it live also), exposing it is a matter of just accessing the body property of the response: // fetch the original image fetch('./tortoise.png') // retrieve its body as readablestream .then(response => response.body) this provides us with a readablestream object.
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Using XMLHttpRequest - Web APIs
examples of both common and more obscure use cases for xmlhttprequest are included.
... function reqlistener () { console.log(this.responsetext); } var oreq = new xmlhttprequest(); oreq.addeventlistener("load", reqlistener); oreq.open("get", "http://www.example.org/example.txt"); oreq.send(); types of requests a request made via xmlhttprequest can fetch the data in one of two ways, asynchronously or synchronously.
... for example, consider this snippet, which uses the responsetype of "arraybuffer" to fetch the remote content into a arraybuffer object, which stores the raw binary data.
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Implementing a Microsoft Active Accessibility (MSAA) Server - Accessibility
for example, screen readers look for screen draws of a vertical blinking line, to determine the location of the caret.
...for example, gecko support isimpledomnode to provide information about the dom node for an accessible object.
...[important] get_accname: get the "name" of the iaccessible, for example the name of a button, checkbox or menu item.
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Relationship of grid layout to other layout methods - CSS: Cascading Style Sheets
two-dimensional layout a simple example can demonstrate the difference between one- and two-dimensional layouts.
... in this first example, i am using flexbox to lay out a set of boxes.
... the same layout with css grids in this next example, i create the same layout using grid.
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<input type="email"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...see allowing multiple e-mail addresses for an example, or html attribute: multiple for more details.
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<input type="tel"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...e id of the <datalist> element that contains the optional pre-defined autocomplete options maxlength the maximum length, in utf-16 characters, to accept as a valid input minlength the minimum length that is considered valid for the field's contents pattern a regular expression the entered value must match to pass constraint validation placeholder an example value to display inside the field when it has no value readonly a boolean attribute which, if present, indicates that the field's contents should not be user-editable size the number of characters wide the input field should be onscreen list the values of the list attribute is the id of a <datalist> element located in the same document.
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Details of the object model - JavaScript
for example, the employee class could represent the set of all employees.
...for example, victoria could be an instance of the employee class, representing a particular individual as an employee.
...for example, assume the employee class includes only the name and dept properties, and manager is a subclass of employee that adds the reports property.
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Working with objects - JavaScript
compare it with a cup, for example.
...for example, let's create an object named mycar and give it properties named make, model, and year as follows: var mycar = new object(); mycar.make = 'ford'; mycar.model = 'mustang'; mycar.year = 1969; the above example could also be written using an object initializer, which is a comma-delimited list of zero or more pairs of property names and associated values of an object, enclosed in curly braces ({})...
...so, for example, you could access the properties of the mycar object as follows: mycar['make'] = 'ford'; mycar['model'] = 'mustang'; mycar['year'] = 1969; an object property name can be any valid javascript string, or anything that can be converted to a string, including the empty string.
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Using custom elements - Web Components
so for example, we can define a custom word-count element like this: customelements.define('word-count', wordcount, { extends: 'p' }); the element is called word-count, its class object is wordcount, and it extends the <p> element.
...for example, wordcount is structured like so: class wordcount extends htmlparagraphelement { constructor() { // always call super first in constructor super(); // element functionality written in here ...
... } } this is just a simple example, but there is more you can do here.
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Preferences - Archive of obsolete content
this article provides examples for extension developers that wish to use the mozilla preferences system.
... here are two examples: // get the root branch var prefs = components.classes["@mozilla.org/preferences-service;1"] .getservice(components.interfaces.nsiprefbranch); // get the "extensions.myext." branch var prefs = components.classes["@mozilla.org/preferences-service;1"] .getservice(components.interfaces.nsiprefservice); prefs = prefs.getbranch("extensions.myext."); simple...
...// look in the above section for examples of getting one.
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Notes on HTML Reflow - Archive of obsolete content
more than one frame may be needed to represent a single element from the content model; for example, text that wraps is broken into several frames, one per wrapped line.
...reflow may have the side-effect of creating new continuation frames, for example, for a text frame when the text must be wrapped.
... some reflows are immediate in response to user or script actions; for example, resizing the window or changing the document's default font.
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Multiple Rules - Archive of obsolete content
« previousnext » all of the examples shown so far have used only a single rule.
...for example, the first rule might match directories or folders, whereas the second rule might match files.
...in this example, the where element in the first rule defines a condition which matches results that have a title of 'canal'.
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Adobe Flash - Archive of obsolete content
the example below shows a detection heuristic in action.
... example 1: verifying the flash plugin version below, javascript identifies the version of flash, and whether it is scriptable in netscape gecko: can we have javascript in a wiki page?
...for example, the current flash plugin version is flash 6 r79.
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Responsive images - Learn web development
here's a simple example: this works well on a wide screen device, such as a laptop or desktop (you can see the example live and find the source code on github.) we won't discuss the css much in this lesson, except to say that: the body content has been set to a maximum width of 1200 pixels — in viewports above that width, the body remains at 1200px and centers itself in the available space.
...raster image formats such as jpegs are more suited to the kind of images we see in the above example.
...you should note that we will be focusing on the html <img>s for this section, as seen in the content area of the example above — the image in the site header is only for decoration, and therefore implemented using css background images.
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NSS Tools modutil
-dbprefix prefix specify the prefix used on the cert8.db and key3.db files (for example, my_cert8.db and my_key3.db).
...this directory should be one below which it is appropriate to store dynamic library files (for example, a server's root directory or the netscape communicator root directory).
... sample script for example, the pkcs #11 installer script could be in the file pk11install.
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nsIHttpChannel
inherits from: nsichannel last changed in gecko 1.3 to create an http channel, use nsiioservice with a http uri, for example: var ios = components.classes["@mozilla.org/network/io-service;1"] .getservice(components.interfaces.nsiioservice); var ch = ios.newchannel("https://www.example.com/", null, null); method overview void getoriginalresponseheader(in acstring aheader, in nsihttpheadervisitor avisitor); acstring getrequestheader(in acstring aheader); acstring getresponseheader(in acstring header); boolea...
...this should be set to false, for example, if the application knows that the corresponding document is likely to be very large.
... responsestatus unsigned long get the http response code (for example 200).
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Using DTMF with WebRTC - Web APIs
each time a tone is sent, the rtcpeerconnection receives a tonechange event with a tone property specifying which tone finished playing, which is an opportunity to update interface elements, for example.
...instead, we'll focus on how to use dtmf within the context of an rtcpeerconnection by studying how an example works.
... simple example this simple example constructs two rtcpeerconnections, establishes a connection between them, then waits for the user to click a "dial" button.
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WindowOrWorkerGlobalScope.setInterval() - Web APIs
examples example 1: basic syntax the following example demonstrates setinterval()'s basic syntax.
... console.log(a); console.log(b); } example 2: alternating two colors the following example calls the flashtext() function once a second until the stop button is pressed.
... <!doctype html> <html> <head> <meta charset="utf-8" /> <title>setinterval/clearinterval example</title> <script> var nintervid; function changecolor() { nintervid = setinterval(flashtext, 1000); } function flashtext() { var oelem = document.getelementbyid('my_box'); oelem.style.color = oelem.style.color == 'red' ?
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An overview of accessible web applications and widgets - Accessibility
example 1: markup for a tabs widget built without aria labeling.
...--> <ol> <li id="ch1tab"> <a href="#ch1panel">chapter 1</a> </li> <li id="ch2tab"> <a href="#ch2panel">chapter 2</a> </li> <li id="quiztab"> <a href="#quizpanel">quiz</a> </li> </ol> <div> <div id="ch1panel">chapter 1 content goes here</div> <div id="ch2panel">chapter 2 content goes here</div> <div id="quizpanel">quiz content goes here</div> </div> example 2: how the tabs widget might be styled visually.
... example 3: markup for the tabs widget with aria attributes added.
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Variable fonts guide - CSS: Cascading Style Sheets
for example linux oses need the latest linux freetype version, and macos prior to 10.13 does not support variable fonts.
...the reason for this is that most typefaces have very specific designs for bolder weights and italics that often include completely different characters (lower-case 'a' and 'g' are often quite different in italics, for example).
...you can use these four-letter tags in css to specify a point along that axis of variation, as will be show in the code examples below.
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<input type="range"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... see the range control with hash marks below for an example of how the options on a range are denoted in supported browsers max the greatest value in the range of permitted values.
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Functions - JavaScript
for more examples and explanations, see also the javascript guide about functions.
...however, object references are values, too, and they are special: if the function changes the referred object's properties, that change is visible outside the function, as shown in the following example: /* declare the function 'myfunc' */ function myfunc(theobject) { theobject.brand = "toyota"; } /* * declare variable 'mycar'; * create and initialize a new object; * assign reference to it to 'mycar' */ var mycar = { brand: "honda", model: "accord", year: 1998 }; /* logs 'honda' */ console.log(mycar.brand); /* pass object reference to the function */ myfunc(mycar); /* * logs 't...
...one can define "named" function expressions (where the name of the expression might be used in the call stack for example) or "anonymous" function expressions.
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Intl.DateTimeFormat.prototype.formatToParts() - JavaScript
the structure the formattoparts() method returns, looks like this: [ { type: 'day', value: '17' }, { type: 'weekday', value: 'monday' } ] possible types are the following: day the string used for the day, for example "17".
... dayperiod the string used for the day period, for example, "am", "pm", "in the morning", or "noon" era the string used for the era, for example "bc" or "ad".
... fractionalsecond the string used for the fractional seconds, for example "0" or "00" or "000".
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XUL Migration Guide - Archive of obsolete content
next, we'll look at some of the main tasks involved in migrating: working with content scripts using the sdk's supported apis how to go beyond the supported apis when necessary, by: using third party modules using the sdk's low-level apis getting direct access to xpcom finally, we'll walk through a simple example.
...in this way an extension can integrate its user interface into the browser: for example, adding menu items, buttons, and toolbars.
... my-addon/ chrome/ content/ locale/ skin/ chrome.manifest data/ lib/ package.json there are limitations on what you can do in this manifest file: for example, you can't register overlays, resource: uris, or components.
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File I/O - Archive of obsolete content
use of os.file is preferred over the examples in this article.
... createinstance(components.interfaces.nsilocalfile); file.initwithpath("/home"); note: the path should be in the "native" form (for example"c:\\windows").
... defprofrt d the root of the default profile directory (for example /root/.mozilla).
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Box Objects - Archive of obsolete content
some content nodes may have several layout objects, for example, each line of a paragraph has a separate layout object.
...a xul element, for example, will have a xulelement type of content node.
...for example changing the display property of a button element to block will cause the button layout object to be deleted and a block object to be created instead.
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Properly Using CSS and JavaScript in XHTML Documents - Archive of obsolete content
} </script> note that this example is not well formed xhtml since the use of raw < is only allowed as a part of markup in xhtml or xml.
... <style type="text/css"> <!-- body {background-color: blue; color: yellow;} --> </style> <script type="text/javascript"> <!-- var i = 0; var sum = 0; for (i = 0; i < 10; ++i) { sum += i; } alert('sum = ' + sum); // --> </script> this example illustrates that a conformant browser can ignore content inside of comments.
... in addition, this example shows how the differences between browsers in handling inline content in text/xml or application/xhtml+xml can be problematic.
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Sizing items in CSS - Learn web development
a straightforward example is an image.
...we have given the image in the example below a border so that you can see the extent of the file.
...in our example below, that border stretches to the width of the container, because it is a block level element, a behavior that should be starting to become familiar to you.
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Images in HTML - Learn web development
so for example, if your image is called dinosaur.jpg, and it sits in the same directory as your html page, you could embed the image like so: <img src="dinosaur.jpg"> if the image was in an images subdirectory, which was inside the same directory as the html page (which google recommends for seo/indexing purposes), then you'd embed it like this: <img src="images/dinosaur.jpg"> and so on.
... you could embed the image using its absolute url, for example: <img src="https://www.example.com/images/dinosaur.jpg"> but this is pointless, as it just makes the browser do more work, looking up the ip address from the dns server all over again, etc.
... note: you can find the finished example from this section running on github (see the source code too.) alternative text the next attribute we'll look at is alt.
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HTML table basics - Learn web development
a table allows you to quickly and easily look up values that indicate some kind of connection between different types of data, for example a person and their age, or a day of the week, or the timetable for a local swimming pool.
...look at the table below for example and find a jovian gas giant with 62 moons.
... table styling you can also have a look at the live example on github!
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Making asynchronous programming easier with async and await - Learn web development
here is a trivial example: async function hello() { return greeting = await promise.resolve("hello"); }; hello().then(alert); of course, the above example is not very useful, although it does serve to illustrate the syntax.
... let's move on and look at a real example.
... rewriting promise code with async/await let's look back at a simple fetch example that we saw in the previous article: fetch('coffee.jpg') .then(response => { if (!response.ok) { throw new error(`http error!
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Looping code - Learn web development
let's look at an example to perfectly illustrate why loops are such a good thing.
... let's say we wanted to draw 100 random circles on a <canvas> element (press the update button to run the example again and again to see different random sets): hidden code <!doctype html> <html> <head> <meta charset="utf-8"> <title>random canvas circles</title> <style> html { width: 100%; height: inherit; background: #ddd; } canvas { display: block; } body { margin: 0; } button { position: absolute; top: 5px; left: 5px; } </style> </head> <body> <button>update</button> <canvas></canvas> <script> const btn = document.queryselector('button'); const canvas = document.queryselector('canvas'); const ctx = canvas.getcontext('2d'); let ...
... let's look at a real example so we can visualize what these do more clearly.
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Inheritance in JavaScript - Learn web development
let's explore how to do this with a concrete example.
...inside here you'll find the same person() constructor example that we've been using all the way through the module, with a slight difference — we've defined only the properties inside the constructor: function person(first, last, age, gender, interests) { this.name = { first, last }; this.age = age; this.gender = gender; this.interests = interests; }; the methods are all defined on the constructor's prototype.
... for example: person.prototype.greeting = function() { alert('hi!
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Strategies for carrying out testing - Learn web development
by coding defensively, we mean trying to build in intelligent fallbacks so that if a feature or style doesn't work in a browser, the site will be able to downgrade to something less exciting that still provides an acceptable user experience — the core information is still accessible, for example, even if it doesn't look quite as nice.
...you can make this as simple or as complex as you like — for example a common approach is to have multiple grades of support level, something like: a grade: common/modern browsers — known to be capable.
... for example, if you live in western europe or north america, you will know that a lot of people use windows and mac desktops/laptops, where the main browsers are chrome, firefox, safari, ie, and edge.
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Scripting Java
for example, we can access the value of the java package: js> packages.java [javapackage java] as a handy shortcut, rhino defines a top-level variable java that is equivalent to packages.java.
... so the previous example could be even shorter: js> java [javapackage java] we can access java classes simply by stepping down the package hierarchy: js> java.io.file [javaclass java.io.file] if your scripts access a lot of different java classes, it can get awkward to use the full package name of the class every time.
...for example, we could import all of the classes in the java.io package and access class java.io.file using just the name file: js> importpackage(java.io) js> file [javaclass java.io.file] here importpackage(java.io) makes all the classes in the java.io package (such as file) available at the top level.
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nsIWebProgressListener
(see below for a description of document requests.) other types of requests, such as requests for inline content (for example images and stylesheets) are considered normal requests.
...this includes other document requests (for example corresponding to html <iframe> elements).
... for example, in the case of navigation within a single frame of a html frameset, a nsiwebprogresslistener instance attached to the nsiwebprogress of the frameset window will receive onstatechange() calls with the state_is_network flag set to indicate the start and stop of said navigation.
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Using IndexedDB - Web APIs
so for example, don't use 2.4 as a version number: var request = indexeddb.open("mytestdatabase", 2.4); // don't do this, as the version will be rounded to 2 generating handlers the first thing you'll want to do with almost all of the requests you generate is to add success and error handlers: request.onerror = function(event) { // do something with request.errorcode!
...creating or updating the version of the database when you create a new database or increase the version number of an existing database (by specifying a higher version number than you did previously, when opening a database), the onupgradeneeded event will be triggered and an idbversionchangeevent object will be passed to any onversionchange event handler set up on request.result (i.e., db in the example).
...so, for example, if you have an object store which holds a set of people, and you want to ensure that no two people have the same email address, you can use an index with the unique flag set to enforce this.
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Capabilities, constraints, and settings - Web APIs
this article discusses capabilities and constraints, as well as media settings, and includes an example we call the constraint exerciser.
... overview the process works like this (using mediastreamtrack as an example): if needed, call mediadevices.getsupportedconstraints() to get the list of supported constraints, which tells you what constrainable properties the browser knows about.
...f you need to know whether or not a given constriant is supported by the user agent, you can find out by calling navigator.mediadevices.getsupportedconstraints() to get a list of the constrainable properties which the browser knows, like this: let supported = navigator.mediadevices.getsupportedconstraints(); document.getelementbyid("framerateslider").disabled = !supported["framerate"]; in this example, the supported constraints are fetched, and a control that lets the user configure the frame rate is disabled if the framerate constraint isn't supported.
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Writing WebSocket client applications - Web APIs
note: the example snippets in this article are taken from our websocket chat client/server sample.
... see the code, then try out the example for yourself.
...these strings are used to indicate sub-protocols, so that a single server can implement multiple websocket sub-protocols (for example, you might want one server to be able to handle different types of interactions depending on the specified protocol).
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Cognitive accessibility - Accessibility
for example, dementia and alzheimer's are permanent cognitive impairments that get progressively worse.
... an example of a temporary cognitive impairment could be people affected by substances such as alcohol or drugs.
...a third example could be sleep deprivation.
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Controlling Ratios of Flex Items Along the Main Axis - CSS: Cascading Style Sheets
in the live example below for instance i have two paragraph elements that contain a string of text.
...for example, if i have a 500 pixel-wide container, flex-direction is row, and i have three flex items each 100 pixels wide, then i have 200 pixels of positive free space, which could be distributed between the items if i wanted them to fill the container.
... in the following examples i am working with flex-direction set to row, therefore the size of items will always come from their width.
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Using media queries - CSS: Cascading Style Sheets
note: the examples on this page use css's @media for illustrative purposes, but the basic syntax remains the same for all types of media queries.
...for example, this css targets printers: @media print { ...
...this example applies styles when the user's primary input mechanism (such as a mouse) can hover over elements: @media (hover: hover) { ...
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Value definition syntax - CSS: Cascading Style Sheets
in addition to this syntax, the set of valid values can be further restricted by semantic constraints (for example, for a number to be strictly positive).
...for example: auto, smaller or ease-in.
... 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.
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Applying color to HTML elements using CSS - HTML: Hypertext Markup Language
for example, if the box's text is being rendered right-to-left, then the border-inline-start-color is applied to the right side of the border.
... as an example, you can represent the opaque color bright blue as "#0000ff" or "#00f".
... for example, a bright red that's 50% opaque can be represented as rgb(255, 0, 0, 0.5) or rgb(100%, 0, 0, 50%).
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Using the application cache - HTML: Hypertext Markup Language
how the application cache works enabling the application cache to enable the application cache for an application, include the manifest attribute in the <html> element: <html manifest="/example.appcache"> … </html> the manifest attribute references a url for a cache manifest file: a text file that lists urls that browsers should cache for your application.
...the notification bar displays a message such as: this website (example.com) is asking to store data on your computer for offline use.
... example 1: a simple cache manifest file the following is a simple cache manifest file, example.appcache, for an imaginary web site at www.example.com.
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MIME types (IANA media types) - HTTP
for example, for the mime type text, the subtype might be plain (plain text), html (html source code), or calendar (for icalendar/.ics) files.
... an optional parameter can be added to provide additional details: type/subtype;parameter=value for example, for any mime type whose main type is text, the optional charset parameter can be used to specify the character set used for the characters in the data.
...for example, multipart mime types are used when attaching multiple files to an email.
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cfx - Archive of obsolete content
cfx usage is: cfx [options] command [command-specific options] "options" are global options applicable to the tool itself or to all commands (for example --help).
... --binary-args=cmdargs pass extra arguments to the binary being executed (for example, firefox).
... for example, to pass the -jsconsole argument to firefox, which will launch the javascript error console, try the following: cfx run --binary-args -jsconsole to pass multiple arguments, or arguments containing spaces, quote them: cfx run --binary-args '-url "www.mozilla.org" -jsconsole' --extra-packages=extra_packages extra packages to include, specified as a comma-separated list of package names.
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Adding Event Handlers - Archive of obsolete content
our find files example let's add a script to the find file dialog.
...for example, you may use urls of the following form: <script src="findfile.js"/> <script src="chrome://findfiles/content/help.js"/> <script src="http://www.example.com/js/items.js"/> this tutorial does not attempt to describe how to use javascript (except as related to event handling) as this is a fairly large topic and there are plenty of other resources that are available for this.
... each event has a name, for example, 'mousemove' is the name of the event that is triggered when the user moves the mouse over a ui element.
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Commands - Archive of obsolete content
a simple way of using commands is as follows: example: simple command example 1 : source view <command id="cmd_openhelp" oncommand="alert('help!');"/> <button label="help" command="cmd_openhelp"/> in this example, instead of placing the oncommand attribute on the button, we instead place it on a command element.
... example: toggling command disabled example 2 : source view <command id="cmd_openhelp" oncommand="alert('help');"/> <button label="help" command="cmd_openhelp"/> <button label="more help" command="cmd_openhelp"/> <button label="disable" oncommand="document.getelementbyid('cmd_openhelp').setattribute('disabled','true');"/> <button label="enable" oncommand="document.getelementbyid('cmd_op...
...enhelp').removeattribute('disabled');"/> in this example, both buttons use the same command.
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Advanced styling effects - Learn web development
you can find the examples in this section at box-shadow.html (see the source code too).
... a simple box shadow let's look at a simple example to get things started.
...0,0,0,0), rgba(0,0,0,0.25)); } .multiple { box-shadow: 1px 1px 1px black, 2px 2px 1px black, 3px 3px 1px red, 4px 4px 1px red, 5px 5px 1px black, 6px 6px 1px black; } now we get this result: we've done something fun here by creating a raised box with multiple coloured layers, but you could use it in any way you want, for example to create a more realistic look with shadows based on multiple light sources.
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The box model - Learn web development
the <a> element, used for links, <span>, <em> and <strong> are all examples of elements that will display inline by default.
... when you move on to learn about css layout in more detail, you will encounter flex, and various other inner values that your boxes can have, for example grid.
... examples of different display types let's move on and have a look at some examples.
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Web fonts - Learn web development
for example, most modern browsers support woff/woff2 (web open font format versions 1 and 2), the most efficient format around, but older versions of ie only support eot (embedded open type) fonts, and you might need to include an svg version of the font to support older versions of iphone and android browsers.
...this video provides a nice walkthrough: active learning: a web font example with this in mind, let's build up a basic web font example from first principles.
... it is difficult to demonstrate this using an embedded live example, so instead, we would like you to follow the steps detailed in the below sections, to get an idea of the process.
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Advanced text formatting - Learn web development
let's look at an example of a set of terms and definitions: soliloquy in drama, where a character speaks to themselves, representing their inner thoughts or feelings and in the process relaying them to the audience (but not to other characters.) monologue in drama, where a character speaks their thoughts out loud to share them with the audience and any other characters present.
...let's finish marking up our example: <dl> <dt>soliloquy</dt> <dd>in drama, where a character speaks to themselves, representing their inner thoughts or feelings and in the process relaying them to the audience (but not to other characters.)</dd> <dt>monologue</dt> <dd>in drama, where a character speaks their thoughts out loud to share them with the audience and any other characters present.</dd> <dt>aside</dt> <dd>in ...
... note that it is permitted to have a single term with multiple descriptions, for example: <dl> <dt>aside</dt> <dd>in drama, where a character shares a comment only with the audience for humorous or dramatic effect.
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Server-side web frameworks - Learn web development
the example below shows how this works in the django (python) web framework.
...for example, the flask (python) web framework adds routes to view functions using a decorator.
... urlpatterns = [ url(r'^$', views.index), # example: /best/myteamname/5/ url(r'^best/(?p<team_name>\w.+?)/(?p<team_number>[0-9]+)/$', views.best), ] make it easy to access data in the request data can be encoded in an http request in a number of ways.
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sslfnc.html
if you are performing operations that require write permission, for example s/mime operations such as adding a certificate, use nss_initreadwrite instead.
...applications may disable any cipher suites that they don't know about (for example, that they cannot present to the user via a gui).
...for example, if a client that has called nss_setdomesticpolicy establishes an ssl connection with a server for which some cipher suites are either not permitted or not enabled (such as an international version of netscape server software), ssl uses the strongest cipher suites supported by the server that are also supported by the client.
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A Web PKI x509 certificate primer
the attributes of the certificates in the verification path have valid parameters for that verification (for example the validity period of all the certificates are valid for the time the verification is being done) revocation checks are considered ok for that particular validation.
...this allows for a certificate to be used for more than one fqdn, for example you can have a certificate that is valid for both a.example.com and b.example.com basic constraints this allows certificates to be asserted as issuing certificates (it is mandatory for ca certificates).
...examples of key usages are: digitalsignature, keyencipherment, dataencipherment, keycertsign, and crlsign.
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Accessing the Windows Registry Using XPCOM
the examples in this document are all written in javascript using xpcom.
... a simple example here's a simple example showing how to read your windows productid: var wrk = components.classes["@mozilla.org/windows-registry-key;1"] .createinstance(components.interfaces.nsiwindowsregkey); wrk.open(wrk.root_key_local_machine, "software\\microsoft\\windows\\currentversion", wrk.access_read); var id = wrk.readstringvalue("productid"); wrk.close(); this example, whil...
... the desired access rights are specified using a named constant from the interface, in this example access_read.
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Standard OS Libraries
example: getcursorpos i wanted to get the mouse cursor position without using a mousemove listener, as this is a high overhead event listener.
...(msdn - getcursorpos) this example was created on windows xp sp2.
... it is a full working example; just copy & paste it to try it out.
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How whitespace is handled by HTML, CSS, and in the DOM - Web APIs
take the following minimal example: <!doctype html> <h1> hello world!
... take the following document, for example: <!doctype html> <html> <head> <title>my document</title> </head> <body> <h1>header</h1> <p> paragraph </p> </body> </html> the dom tree for this looks like so: conserving whitespace characters in the dom is useful in many ways, but there are certain places where this makes certain layouts more difficult to implement, and causes problems for developers who want to iterate throug...
...in the earlier example one of the spaces between "hello" and "world!" still exists when the page is rendered in a browser.
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Using Fetch - Web APIs
have a look at the following code: fetch('http://example.com/movies.json') .then(response => response.json()) .then(data => console.log(data)); here we are fetching a json file across the network and printing it to the console.
... // example post method implementation: async function postdata(url = '', data = {}) { // default options are marked with * const response = await fetch(url, { method: 'post', // *get, post, put, delete, etc.
... manual, *follow, error referrerpolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url body: json.stringify(data) // body data type must match "content-type" header }); return response.json(); // parses json response into native javascript objects } postdata('https://example.com/answer', { answer: 42 }) .then(data => { console.log(data); // json data parsed by `data.json()` call }); note that mode: "no-cors" only allows a limited set of headers in the request: accept accept-language content-language content-type with a value of application/x-www-form-urlencoded, multipart/form-data, or text/plain sending a request with credentials included to cause...
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Pointer events - Web APIs
for example, in the case of a pen, when the pen has physical contact with the digitizer, or at least one button is depressed while hovering.
...for example, a pen that is a down state is considered active because it can produce additional events when the pen is lifted or moved.
...examples of pointer input devices are mouse, pen/stylus, and touch contacts.
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WebGL model view projection - Web APIs
for this example, it's easiest to illustrate how clip space works by simply using model coordinate values ranging from (-1,-1,-1) to (1,1,1).
... webglbox example this example will create a custom webglbox object that will draw a 2d box on the screen.
... note: the code for each webglbox example is available in this github repo and is organized by section.
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Using CSS gradients - CSS: Cascading Style Sheets
we'll start by introducing linear gradients, then introduce features that are supported in all gradient types using linear gradients as the example, then move on to radial, conic and repeating gradients using linear gradients a linear gradient creates a band of colors that progress in a straight line.
...in this example, the colors share a color stop at the 50% mark, halfway through the gradient: <div class="striped"></div> div { width: 120px; height: 120px; } .striped { background: linear-gradient(to bottom left, cyan 50%, palegoldenrod 50%); } gradient hints by default, the gradient transitions evenly from one color to the next.
...in this example, we've moved the midpoint of the transition from the 50% mark to the 10% mark.
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<input type="datetime-local"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...when the above value submitted to the server, for example, it will look like partydate=2017-06-01t08:30.
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<input type="number"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...o the attributes commonly supported by all <input> types, inputs of type number support these attributes: attribute description list the id of the <datalist> element that contains the optional pre-defined autocomplete options max the maximum value to accept for this input min the minimum value to accept for this input placeholder an example value to display inside the field when it's empty readonly a boolean attribute indicating whether the value is read-only step a stepping interval to use when using up and down arrows to adjust the value, as well as for validation list the values of the list attribute is the id of a <datalist> element located in the same document.
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<input type="url"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... see the section pattern validation for details and an example.
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Assertions - JavaScript
for example, /^a/ does not match the "a" in "an a", but does match the first "a" in "an a".
...for example, /t$/ does not match the "t" in "eater", but does match it in "eat".
... examples: /\bm/ matches the "m" in "moon".
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Character classes - JavaScript
character classes distinguish kinds of characters such as, for example, distinguishing between letters and digits.
...for example, /.y/ matches "my" and "ay", but not "yes", in "yes make my day".
...for example, /\d/ or /[0-9]/ matches "2" in "b2 is the suite number".
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Search Extension Tutorial (Draft) - Archive of obsolete content
while the technical details below are important to understand, a library which encapsulates the appropriate logic is provided along with the example add-on at the end, and should be used where possible.
...the following file, for instance, would change the default keyword search engine, assuming that an engine with the name example engine is installed, as described below: // this is a localizable preference, so it must contain a url which // points at a properties file containing the preference name as a // property.
...pref("browser.search.defaultenginename", "data:text/plain,browser.search.defaultenginename=example engine"); in the case or restartless extensions, the preferences need to be changed manually, and reverted when the extension is disabled if they have not been changed in the meantime.
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Creating a Firefox sidebar extension - Archive of obsolete content
example 1.
...it is listed in example 2.
... example 2.
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Creating regular expressions for a microsummary generator - Archive of obsolete content
for example, the following regular expression matches--and looks exactly like--the beginning of the url: http:// but some characters are special in regular expressions.
... for example, a period (.) matches any character, and a period followed by an asterisk (.*) matches any combination of characters.
... here's a regular expression that matches our example url: http://cgi\.ebay\.com/ws/ebayisapi\.dll\?viewitem&item=280018439106 it looks almost the same as the url.
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OpenClose - Archive of obsolete content
a simple example: somemenu.open = true; this single line of code will open a menu referenced by the variable 'somemenu'.
...here is a complete example which uses a button to open a menu: <button label="open menu" oncommand="document.getelementbyid('editmenu').open = true;"/> <menu id="editmenu" label="edit"> <menupopup> <menuitem label="cut"/> <menuitem label="copy"/> <menuitem label="paste"/> </menupopup> </menu> this technique may be used for both menupopups that use the menu tag, the button tag and the toolbarbutton tag.
...see the popupshown event for an example of how to do this.
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Keyboard Shortcuts - Archive of obsolete content
in the example below, the file menu can be selected by pressing alt + f together (or some other key combination for a specific platform).
... example 1 : source view <menubar id="sample-menubar"> <menu id="file-menu" label="file" accesskey="f"> <menupopup id="file-popup"> <menuitem id="close-command" label="close" accesskey="c"/> </menupopup> </menu> </menubar> you can also use the accesskey attribute on buttons.
...for example, pressing ctrl + c to copy text to the clipboard.
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RDF Datasources - Archive of obsolete content
some of them are listed here with a few examples.
...using the history list example let's see an example of displaying the history list.
...example 1 : source <tree flex="1" datasources="rdf:history" ref="nc:historyroot"> <treecols> <treecol id="name" label="name" flex="1"/> <treecol id="url" label="url" flex="1"/> <treecol id="date" label="date" flex="1"/> </treecols> <template> <rule> <treechildren> <treeitem uri="rdf:*"> <treerow> <treecell label="rdf:http://home.netscape.com/nc-rdf#name"/> <treecell label="rdf:http://home.netscape.com/nc-rdf#url"/> <treecell label="rdf:http://home.netscape.com/nc-rdf#date"/> </treerow> </treeitem> </treechildren> </rule> </template> </tree> other datasources the tables below list some of the other dat...
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Tree Box Objects - Archive of obsolete content
you don't need to call the rowcountchanged() function when a row has simply changed in some way, for example if a cell's label changes.
... note: it is not necessary to run tree.boxobject.queryinterface(components.interfaces.nsitreeboxobject) as shown in the code examples on this page because: let boxobject = tree.treeboxobject; note: is equivalent to: let boxobject = tree.boxobject; boxobject.queryinterface("components.interfaces.nsitreeboxobject"); scrolling the tree you can also scroll the tree using four different methods, similar to those available for listboxes.
...here is a simple example.
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The First Install Problem - Archive of obsolete content
the solution is to encourage plugin vendors to write registry keys to the win32 system registry, like the example application.
...example: a piece of software called myapplication might create hkey_local_machine\software\mozillaplugins\@mycompany.com/myapplication,version=5.0.1/ where the plid is something the corporation that makes myapplication (mycompany inc.) determines.
...(note that the file name must still begin with "np", just as it must when the file is loaded from the .\plugins directory.) example: [hkey_local_machine\software\mozillaplugins\@mycompany.com/myapplication,version=5.01] path=c:\mycompany\myapplication\netscape\npmyapp.dll "xptpath" -- string value -- absolute path to xpt module required for scripting plug-in, if applicable example: [hkey_local_machine\software\mozillaplugins\@mycompany.com/myapplication,version=5.01] xptpath=c:\mycompany\m...
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What is RSS - Archive of obsolete content
you will not yet be creating your own rss files, but you will be seeing how rss is commonly used and simple example rss files for these common uses.
...for example: <?xml version="1.0"?> <rss version="2.0"> <channel> <title>example news site</title> <description>this is an example news site.</description> <lastbuilddate>wed, 27 jul 2005 00:30:30 -0700</lastbuilddate> <link>http://news.example.com/</link> <item> <title>news flash: i like bread</title> <guid ispermalink="false">4d4a0a12-f188...
...-4c97-908b-eea27213c2fe</guid> <pubdate>wed, 27 jul 2005 00:30:30 -0700</pubdate> <link>http://news.example.com/artcle/554</link> </item> <item> <title>big news today: birds fly</title> <guid ispermalink="false">c4a63f09-b45b-466b-8773-6ff264001ab7</guid> <pubdate>tue, 19 jul 2005 04:32:51 -0700</pubdate> <link>http://news.example.com/artcle/553</link> </item> <item> <title>fire is hot</title> <guid ispermalink="false">c1795324-d5ea-44fa-95b1-b5ce2090d4f1</guid> <pubdate>sun, 15 may 2005 13:02:08 -0700</pubdate> <link>http://news.example.com/artcle/552</link> </item> </channel> </rss> bloggers use rss to provide everyone with a list ...
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Using the Right Markup to Invoke Plugins - Archive of obsolete content
here's an example of this kind of usage for ie: <!-- ie only code --> <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0" width="366" height="142" id="myflash"> <param name="movie" value="javascript-to-flash.swf" /> <param name="quality" value="high" /> <param name="swliveconnect" value="true" /> </...
...object> in the above example, the classid attribute that goes along with the object element points to a "clsid:" urn followed by the unique identifier of an activex control (in the above example, the string beginning with "d27...").
...here is an example of this usage, once again for the macromedia flash plugin: <object type="application/x-shockwave-flash" data="javascript-to-flash.swf" width="366" height="142" id="myflash"> <param name="movie" value="javascript-to-flash.swf" /> <param name="quality" value="high" /> <param name="swliveconnect" value="true" /> <p>you need flash -- get the latest version from <a href= "http://w...
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Pseudo-classes and pseudo-elements - Learn web development
pseudo-classes are keywords that start with a colon: :pseudo-class-name simple pseudo-class example let's look at a simple example.
... if we wanted to make the first paragraph in an article larger and bold, we could add a class to that paragraph and then add css to that class, as shown in the first example below: however, this could be annoying to maintain — what if a new paragraph got added to the top of the document?
...take a look at some other examples on mdn: :last-child :only-child :invalid note: it is valid to write pseudo-classes and elements without any element selector preceding them.
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The HTML5 input types - Learn web development
see the firefox for android keyboard screenshot below for an example: note: you can find examples of the basic text input types at basic input examples (see the source code also).
... the following firefox for android keyboard screenshot provides an example: due to the wide variety of phone number formats around the world, this type of field does not enforce any constraints on the value entered by a user (this means it may include letters, etc.).
... see below for an example (taken on firefox for android): note: just because the url is well-formed doesn't necessarily mean that it refers to a location that actually exists!
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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.
... here is a little example: <form> <fieldset> <legend>fruit juice size</legend> <p> <input type="radio" name="size" id="size_1" value="small"> <label for="size_1">small</label> </p> <p> <input type="radio" name="size" id="size_2" value="medium"> <label for="size_2">medium</label> </p> <p> <input type="radio" name="size" id="size_3" value="large"> <label for="size_3">large</label> </p> </fieldset> </form> note: you can find this example in fieldset-legend.html (see it live also).
... the use case in this example is one of the most important.
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Video and audio content - Learn web development
we have provided you with sample audio and video files and example code for your own experimentation, in case you are unable to get hold of your own.
...a really simple example looks like this: <video src="rabbit320.webm" controls> <p>your browser doesn't support html5 video.
... the embedded video will look something like this: you can try the example live here (see also the source code.) using multiple source formats to improve compatibility there's a problem with the above example, which you may have noticed already if you've tried to access the live link above with an older browser like internet explorer or even an older version of safari.
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Functions — reusable blocks of code - Learn web development
every time we manipulated a text string, for example: let mytext = 'i am a string'; let newstring = mytext.replace('string', 'sausage'); console.log(newstring); // the replace() string function takes a source string, // and a target string and replaces the source string, // with the target string, and returns the newly formed string or every time we manipulated an array: let myarray = ['i', 'love', 'chocolate', 'frogs']; let madeastring = myarra...
...in our random-canvas-circles.html example (see also the full source code) from our loops article, we included a custom draw() function that looked like this: function draw() { ctx.clearrect(0,0,width,height); for (let i = 0; i < 100; i++) { ctx.beginpath(); ctx.fillstyle = 'rgba(255,0,0,0.5)'; ctx.arc(random(width), random(height), random(50), 0, 2 * math.pi); ctx.fill(); } } this function draws 100 random circles...
...the above function for example calls the random() function three times, which is defined by the following code: function random(number) { return math.floor(math.random()*number); } we needed this function because the browser's built-in math.random() function only generates a random decimal number between 0 and 1.
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A first splash into JavaScript - Learn web development
with that in mind, let's look at the example we'll be building up in this article, and review the general process of dissecting it into tangible tasks.
... example — guess the number game in this article we'll show you how to build up the simple game you can see below: top hidden code <!doctype html> <html> <head> <meta charset="utf-8"> <title>number guessing game</title> <style> html { font-family: sans-serif; } body { width: 50%; max-width: 800px; min-width: 480px; margin: 0 auto; } .lastresult { color: white; padding: 3px; } </style> </head> <body> <h1>number guessing game</h1> <p>we have selected a random number between 1 and 100.
... let's now move forward, looking at how we can turn these steps into code, building up the example, and exploring javascript features as we go.
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Introduction to the server side - Learn web development
it can also make sites easier to use by storing personal preferences and information — for example reusing stored credit card details to streamline subsequent payments.
... the request includes a url identifying the affected resource, a method that defines the required action (for example to get, delete, or post the resource), and may include additional information encoded in url parameters (the field-value pairs sent via a query string), as post data (data sent by the http post method), or in associated cookies.
... server-side code can be written in any number of programming languages — examples of popular server-side web languages include php, python, ruby, c#, and nodejs(javascript).
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Client-side tooling overview - Learn web development
often linters can be configured to not only report errors, but also report any violations of a specified style guide that you team might be using (for example code that is using the wrong number of spaces for indentation, or using template literals rather than regular string literals).
... prettier is a very popular example of a code formatter, which we’ll make use of later on in the module.
... 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.
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IPDL Tutorial
here is a dirt-simple example of how a browser implementor might use ppluginparent.
... the parameters of the recv* methods (const nscstring& pluginpath in the example) are references to temporary objects, so copy them if you need to keep their data around.
...the following artificial example shows how these specifiers are used and how these specifiers change the generated abstract actor classes.
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WebRequest.jsm
you can use this api to implement a content policy in an add-on (for example, an ad or script blocker), as you could using nsicontentpolicy.
... some examples of using addlistener().
... see some examples of using filter.
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NSS Tools certutil
some smart cards (for example, the litronic card) can store only one key pair.
... some smart cards (for example, the litronic card) do not let you remove a public key you have generated.
... -p dbprefix specify the prefix used on the cert8.db and key3.db files (for example, my_cert8.db and my_key3.db).
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nsIHTMLEditor
example: aproperty="font", aattribute="color" avalue if aattribute is not null, the value of the attribute.
... example: aproperty="font", aattribute="color", avalue="0x00ffff" addinsertionlistener() add listener for insertion override.
... boolean breakisvisible( in nsidomnode anode ); parameters anode return value candrag() decides if a drag should be started (for example, based on the current selection and mousepoint).
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Aggregate view - Firefox Developer Tools
you can use this to filter the contents of the snapshot that are displayed, so you can quickly see, for example, how many objects of a specific class were allocated.
...for example, in the screenshot above you can see that javascript objects account for most memory, followed by strings.
... the screenshots in this section are taken from a snapshot of the monster example page.
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window.postMessage() - Web APIs
this mechanism provides control over where messages are sent; for example, if postmessage() was used to transmit a password, it would be absolutely critical that this argument be a uri whose origin is the same as the intended receiver of the message containing the password, to prevent interception of the password by a malicious third party.
... the dispatched event otherwindow can listen for dispatched messages by executing the following javascript: window.addeventlistener("message", receivemessage, false); function receivemessage(event) { if (event.origin !== "http://example.org:8080") return; // ...
...examples of typical origins are https://example.org (implying port 443), http://example.net (implying port 80), and http://example.com:8080.
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Text labels and names - Accessibility
examples the following example show a simple image map (taken from h24: providing text alternatives for the area elements of image maps): <img src="welcome.gif" usemap="#map1" alt="areas in the library.
... select an area for more information on that area." /> <map id="map1" name="map1"> <area shape="rect" coords="0,0,30,30" href="reference.html" alt="reference" /> <area shape="rect" coords="34,34,100,100" href="media.html" alt="audio visual lab" /> </map> see the <area> element reference page for a live interactive example.
... see also <area> h24: providing text alternatives for the area elements of image maps dialogs should be labeled for any container whose contents act as a dialog box (for example, a modal dialog asking the user to make a choice or respond to an action being taken), give it a descriptive label or name, so that assistive technology users can easily discover what its purpose is.
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CSS selectors - CSS: Cascading Style Sheets
syntax: * ns|* *|* example: * will match all the elements of the document.
... syntax: elementname example: input will match any <input> element.
... syntax: .classname example: .index will match any element that has a class of "index".
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<input type="file"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...see htmlinputelement.webkitdirectory for additional details and examples.
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<input type="search"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... see the section specifying a pattern for details and an example.
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<input type="time"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...you can set a default value for the input by including a valid time in the value attribute when creating the <input> element, like so: <label for="appt-time">choose an appointment time: </label> <input id="appt-time" type="time" name="appt-time" value="13:30"> you can also get and set the date value in javascript using the htmlinputelement.value property, for example: var timecontrol = document.queryselector('input[type="time"]'); timecontrol.value = '15:30'; time value format the value of the time input is always in 24-hour format that includes leading zeros: hh:mm, regardless of the input format, which is likely to be selected based on the user's locale (or by the user agent).
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Regular expressions - JavaScript
the last example includes parentheses, which are used as a memory device.
...for example, the pattern /abc/ matches character combinations in strings only when the exact sequence "abc" occurs (all characters together and in that order).
...for example, to match a single "a" followed by zero or more "b"s followed by "c", you'd use the pattern /ab*c/: the * after "b" means "0 or more occurrences of the preceding item." in the string "cbbabbbbcdebc", this pattern will match the substring "abbbbc".
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this - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... function f1() { return this; } // in a browser: f1() === window; // true // in node: f1() === globalthis; // true in strict mode, however, if the value of this is not set when entering an execution context, it remains as undefined, as shown in the following example: function f2() { 'use strict'; // see strict mode return this; } f2() === undefined; // true in the second example, this should be undefined, because f2 was called directly and not as a method or property of an object (e.g.
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Web audio codec guide - Web media technologies
for example, if the encoder is configured to reduce the sample rate, the sample rate's effect on the output file will be reduced in kind.
... lfe channels are specifically designed to store low-frequency audio data, and are commonly used to provide audio data for subwoofers, for example.
...for example, mp3 supports one lfe channel, while aac supports up to 16.
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Namespaces crash course - SVG: Scalable Vector Graphics
for example, svg and mathml might be incorporated directly into an xhtml based scientific document.
...for example, both xhtml and svg have a <title> element.
...here is a short example.
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Introduction to using XPath in JavaScript - XPath
numbervalue stringvalue booleanvalue example the following uses the xpath expression count(//p) to obtain the number of <p> elements in an html document: var paragraphcount = document.evaluate( 'count(//p)', document, null, xpathresult.any_type, null ); alert( 'this document contains ' + paragraphcount.numbervalue + ' paragraph elements' ); although javascript allows us to convert the number to a string for display, the xpath interface...
... iterator example var iterator = document.evaluate('//phonenumber', documentnode, null, xpathresult.unordered_node_iterator_type, null ); try { var thisnode = iterator.iteratenext(); while (thisnode) { alert( thisnode.textcontent ); thisnode = iterator.iteratenext(); } } catch (e) { alert( 'error: document tree modified during iteration ' + e ); } snapshots when the specified result type in ...
... snapshots do not change with document mutations, so unlike the iterators, the snapshot does not become invalid, but it may not correspond to the current document, for example, the nodes may have been moved, it might contain nodes that no longer exist, or new nodes could have been added.
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Promises - Archive of obsolete content
the following page contains examples of many promise-based replacement apis for common operations.
... the following examples make use of the task api, which harnesses generator functions to remove some of the syntactic clutter of raw promises, such that asynchronous promise code more closely resembles synchronous, procedural code.
... a task example like the following: components.utils.import("resource://gre/modules/task.jsm"); task.spawn(function* () { var response = yield request("login", { username: user, password: password }); if (response.messages) { try { yield publish({ username: user, messages: response.messages }); } catch (e) { self.reporterror("publication failed", e); } } }); can be converted to a pure promise-based equivalent as such: request("login", { username: user, password: password }) .then(response => { if (response.messages) return publish({ username: user, messages: response.messages }); }) .then(null, (e) => { self.reporterror("publication failed", e); }); file io file io in add-ons shou...
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Menu - Archive of obsolete content
the api is fairly comprehensive, so you may want to start by reading through some examples.
...in the future it may be a submenu of the tools menu, for example.
...for example, the items of the page's context menu change depending on what the user clicks: images have a context menu, links have a context menu, and so on.
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Multiple Queries - Archive of obsolete content
here is an example using an rdf datasource: <hbox id="photoslist" datasources="template-guide-photos3.rdf" ref="http://www.xulplanet.com/rdf/myphotos"> <template> <queryset> <query> <content uri="?start"/> <member container="?start" child="?photo"/> <triple subject="?photo" predicate="http://purl.org/dc/elements/1.1/title" object="canal"/> ...
...when used together in this example, the results are combined and only three results are shown.
...in this particular example, we could actually have used two rules instead.
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Simple Query Syntax - Archive of obsolete content
there are several attributes in the example xul content above that have values prefixed with 'rdf:'.
...for example, the label's value attribute has a value of rdf:http://purl.org/dc/elements/1.1/title'.
...for example: <label value="rdf:http://purl.org/dc/elements/1.1/title http://www.xulplanet.com/rdf/country"/> the 'rdf:' form is really equivalent to the <binding> tag in the full syntax.
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Focus and Selection - Archive of obsolete content
here is an example: example 1 : source view <button label="button 1" tabindex="2"/> <button label="button 2" tabindex="1"/> <button label="button 3" tabindex="3"/> the focus event the focus event is used to respond when the focus is given to an element.
...the following example can be used to apply a function to handle a focus event.
... example 2 : source view <script> function displayfocus(){ var elem=document.getelementbyid('sbar'); elem.setattribute('value','enter your phone number.'); } </script> <textbox id="tbox1"/> <textbox id="tbox2" onfocus="displayfocus();"/> <description id="sbar" value=""/> the focus event, when it occurs, will call the displayfocus function.
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Trees and Templates - Archive of obsolete content
the following example uses the history datasource: <tree datasources="rdf:history" ref="nc:historybydate" flags="dont-build-content"> as described in the previous section, the tree may use a tree builder for template generation instead of the normal content builder.
...the flags attribute set to the value dont-build-content, as used in the example above, indicates that the tree builder should be used.
...template-built tree example the following example demonstrates a template-built tree, in this case for the file system.
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Using Spacers - Archive of obsolete content
(java uses layout managers for example.) xul provides the capability for elements to position and resize automatically.
... our find file example the code to add a spacer is shown below.
...for example, you might want to have the find button resize instead.
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The Implementation of the Application Object Model - Archive of obsolete content
examples of these interfaces include nsidomelement, nsidomnode, nsixmlcontent, and nsicontent.
...for example, the traditional bookmarks tree view could contain anything from mail messages to local files to maps of other sites.
...an example of this feature is a downloadable file that describes the user's main bookmarks folder.
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Back to the Server: Server-Side JavaScript On The Rise - Archive of obsolete content
in addition, the jaxer “ajax server” (a project i work on at aptana) is an example of ssjs that uses not only spidermonkey, but also embeds the entire firefox browser engine in the application server such that you can do server-side dom manipulation and other ajaxy things server-side that rhino was not built to do.
... let's take a look at various ssjs implementations and some examples of putting them to use.
...the helma web application framework is an example of rhino in use.
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XForms Custom Controls - Archive of obsolete content
this is required for all examples here to run!
...for example, you might want to render images that are held inside an instance document or you would like to show a disabled trigger when its bound node becomes irrelevant rather than having it not display (the current default behavior).
...for example, in the mozilla xforms extension we will render a combobox widget when appearance='minimal' on a select1 control.
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Organizing your CSS - Learn web development
consistency can be applied in all sorts of ways, such as using the same naming conventions for classes, choosing one method of describing color, or maintaining consistent formatting (for example will you use tabs or spaces to indent your code?
... you may have used a css property in a specific way to get around older browser incompatibilities, for example: .box { background-color: red; /* fallback for older browsers that don't support gradients */ background-image: linear-gradient(to right, #ff0000, #aa0000); } perhaps you followed a tutorial to achieve something, and the css is a little non-obvious.
...} after this section we could define a few utility classes, for example a class that removes the default list style for lists we're going to display as flex items or in some other way.
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Grids - Learn web development
you will see an example with a container, which has some child items.
... simple grid example body { width: 90%; max-width: 900px; margin: 2em auto; font: .9em/1.2 arial, helvetica, sans-serif; } .container > div { border-radius: 5px; padding: 10px; background-color: rgb(207,232,220); border: 2px solid rgb(79,185,227); } <div class="container"> <div>one</div> <div>two</div> <div>three</div> <div>four</div> <div>five</div> <div>six</div> <div>seven</div>...
...the fr unit distributes space in proportion, therefore you can give different positive values to your tracks, for example if you change the definition like so: .container { display: grid; grid-template-columns: 2fr 1fr 1fr; } the first track now gets 2fr of the available space and the other two tracks get 1fr, making the first track larger.
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Styling lists - Learn web development
a simple list example to begin with, let's look at a simple list example.
...the unstyled example is available on github (check out the source code too.) the html for our list example looks like so: <h2>shopping (unordered) list</h2> <p>paragraph for reference, paragraph for reference, paragraph for reference, paragraph for reference, paragraph for reference, paragraph for reference.</p> <ul> <li>hummus</li> <li>pita</li> <li>green salad</li> <li>halloumi</li> </ul> <h2>recipe (ordered) list</h2> <p>paragraph for reference, paragraph for reference, paragraph for reference, paragraph for reference, paragraph for reference, paragraph for reference.</p> <ol> <li>toast pita, leave...
...ini, lemon juice, salt, garlic, and other ingredients.</dd> <dt>pita</dt> <dd>a soft, slightly leavened flatbread.</dd> <dt>halloumi</dt> <dd>a semi-hard, unripened, brined cheese with a higher-than-usual melting point, usually made from goat/sheep milk.</dd> <dt>green salad</dt> <dd>that green healthy stuff that many of us just use to garnish kebabs.</dd> </dl> if you go to the live example now and investigate the list elements using browser developer tools, you'll notice a couple of styling defaults: the <ul> and <ol> elements have a top and bottom margin of 16px (1em) and a padding-left of 40px (2.5em.) the list items (<li> elements) have no set defaults for spacing.
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CSS basics - Learn web development
for example, this css selects paragraph text, setting the color to red: p { color: red; } let's try it out!
...it defines the element(s) to be styled (in this example, <p> elements).
...(in this example, color is a property of the <p> elements.) in css, you choose which properties you want to affect in the rule.
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Document and website structure - Learn web development
main content: a big area in the center that contains most of the unique content of a given webpage, for example, the video you want to watch, or the main story you're reading, or the map you want to view, or the news headlines, etc.
...usually, this is contextual to what is contained in the main content (for example on a news article page, the sidebar might contain the author's bio, or links to related articles) but there are also cases where you'll find some recurring elements like a secondary navigation system.
... a "typical website" could be structured something like this: html for structuring content the simple example shown above isn't pretty, but it is perfectly fine for illustrating a typical website layout example.
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Test your skills: Links - Learn web development
the second link should be turned into a link you can click to open up an email in the user's default mail application, with the recipient set as "whales@example.com".
... note: the first link in the example has the target="_blank" attribute set on it, so that when you click on it, it opens the page in a new tab.
... this is not strictly best practice, but we've done it here so that the page doesn't open in the embedded <iframe>, getting rid of your example code in the process!
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HTML table advanced features and accessibility - Learn web development
</table> as you can infer from the brief example above, the caption is meant to contain a description of the table contents.
...we'd recommend using the <caption> element instead, however, as summary is deprecated by the html5 spec, and can't be read by sighted users (it doesn't appear on the page.) active learning: adding a caption let's try this out, revisiting an example we first met in the previous article.
...to give you some interesting examples, in the case of a long table you could make the table header and footer repeat on every printed page, and you could make the table body display on a single page and have the contents available by scrolling up and down.
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Useful string methods - Learn web development
when you create a string, for example by using let string = 'this is my string'; your variable becomes a string object instance, and as a result has a large number of properties and methods available to it.
... let's enter some examples into the browser developer console.
...this is useful for many reasons; for example, you might want to find the lengths of a series of names so you can display them in order of length, or let a user know that a username they have entered into a form field is too long if it is over a certain length.
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Working with JSON - Learn web development
"superhuman reflexes" ] }, { "name": "eternal flame", "age": 1000000, "secretidentity": "unknown", "powers": [ "immortality", "heat immunity", "inferno", "teleportation", "interdimensional travel" ] } ] } if we loaded this object into a javascript program, parsed in a variable called superheroes for example, we could then access the data inside it using the same dot/bracket notation we looked at in the javascript object basics article.
... for example: superheroes.hometown superheroes['active'] to access data further down the hierarchy, you simply have to chain the required property names and array indexes together.
... for example, to access the third superpower of the second hero listed in the members list, you'd do this: superheroes['members'][1]['powers'][2] first we have the variable name — superheroes.
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Application Translation with Mercurial
in this example, we assume firefox for desktop shall be localized and that the localization branch is aurora.
...this example uses winmerge: download and install it.
...this example uses notepad++.
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NSS tools : signtool
for example, a commercial software developer might sign the files that constitute a software product to prove that the files are indeed from a particular company.
... for example, if you are a software developer, you should test your code to make sure it is virus-free before signing it.
...if the certificate authority's certificate isn't already installed in your copy of communicator, you typically install it by clicking the appropriate link on the certificate authority's web site, for example on the page from which you initiated enrollment for your signing certificate.
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Tutorial: Embedding Rhino
fully compilable examples are provided along the way.
... the examples live in the rhino/examples directory in the distribution and in mozilla/js/rhino/examples in cvs.
... initializing standard objects collecting the arguments evaluating a script printing the result exiting the context expose java apis using java apis implementing interfaces adding java objects using javascript objects from java using javascript variables calling javascript functions javascript host objects defining host objects counter example counter's constructors class name dynamic properties defining javascript "methods" adding counter to runscript runscript: a simple embedding about the simplest embedding of rhino possible is the runscript example.
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Introduction to XPCOM for the DOM
here is some example code.
...the following example demonstrates this.
...for example, in the previous example, nothing bad will happen if ifooptr is null.
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nsICryptoHash
you can, for example, calculate the sha256 hash of a file to determine if it contains the data you think it does.
...see computing the hash of a string for an example of using this method.
...see computing the hash of a file for an example of using this method.
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Using the Screen Capture API - Web APIs
example of a window allowing the user to select a display surface to capture you can then use the captured stream, capturestream, for anything that accepts a stream as input.
... the examples below show a few ways to make use of the stream.
... for example, if you specify a width constraint for the video, it's applied by scaling the video after the user selects the area to share.
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Migrating from webkitAudioContext - Web APIs
this article attempts to summarize the areas where developers are likely to encounter these problems and provide examples on how to port such code to standards based audiocontext, which will work across different browser engines.
... if your code uses either of these names, like in the example below : // old method names var gain = context.creategainnode(); var delay = context.createdelaynode(); var js = context.createjavascriptnode(1024); you can simply rename the methods to look like this: // new method names var gain = context.creategain(); var delay = context.createdelay(); var js = context.createscriptprocessor(1024); the semantics of these methods remain the same in the ren...
... for example, if you have code like the below: var osc = context.createoscillator(); osc.noteon(1); osc.noteoff(1.5); var src = context.createbuffersource(); src.notegrainon(1, 0.25); src.noteoff(2); you can simply change it like this in order to port it to the standard audiocontext api: var osc = context.createoscillator(); osc.start(1); osc.stop(1.5); var src = context.createbuffersource(); src.start(...
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Accessibility documentation index - Accessibility
4 aria test cases aria, accessibility for each example we test the "expected" results with assistive technologies, for each browser that at supports wai-aria in.
... 8 forms aria, accessibility the following pages provide various techniques for improving the accessibility of web forms: 9 alerts aria, accessibility, forms, web you have a form — a contact form, for example — that you want to put some accessible error checking into.
... examples of common problems include e-mail addresses which are not valid, or a name field which does not contain at least a first name or a surname.
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Using CSS animations - CSS: Cascading Style Sheets
letting the browser control the animation sequence lets the browser optimize performance and efficiency by, for example, reducing the update frequency of animations running in tabs that aren't currently visible.
... examples note: some older browsers (pre-2017) may need prefixes; the live examples you can click to see in your browser include the -webkit prefixed syntax.
... making text slide across the browser window this simple example styles the <p> element so that the text slides in from off the right edge of the browser window.
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Aligning Items in a Flex Container - CSS: Cascading Style Sheets
you can take a look at the code of this example below.
... we are making use of cross-axis alignment in the most simple flex example.
... we can use other values to control how the items align: align-items: flex-start align-items: flex-end align-items: center align-items: stretch align-items: baseline in the live example below, the value of align-items is stretch.
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CSS grids, logical values, and writing modes - CSS: Cascading Style Sheets
in the example below, i have two paragraphs.
... this is a very simple example of the problem with physical values and properties being used in css.
... css writing modes i’m going to introduce another specification here, that i will be using in my examples: the css writing modes specification.
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Realizing common layouts using CSS Grid Layout - CSS: Cascading Style Sheets
we will look at an example using grid-template-areas, a typical 12-column flexible grid system, and also a product listing using auto-placement.
... as you can see from this set of examples, there is often more than one way to achieve the result you want with grid layout.
... this is a simple example but demonstrates how we can use a grid layout to rearrange our layout for different breakpoints.
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list-style-type - CSS: Cascading Style Sheets
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...a, b, c, … z upper-latin is unsupported in ie7 and earlier arabic-indic -moz-arabic-indic example armenian traditional armenian numbering (ayb/ayp, ben/pen, gim/keem… bengali -moz-bengali example cambodian * example is a synonym for khmer cjk-earthly-branch -moz-cjk-earthly-branch example cjk-heavenly-stem -moz-cjk-heavenly-stem example cjk-ideographic identical to trad-chinese-informal e.g.
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Audio and video manipulation - Developer guides
having native audio and video in the browser means we can use these data streams with technologies such as <canvas>, webgl or web audio api to modify audio and video directly, for example adding reverb/compression effects to audio, or grayscale/sepia filters to video.
... for example, let's process a video to display it in greyscale.
... for (var i = 0; i < l; i++) { var grey = (frame.data[i * 4 + 0] + frame.data[i * 4 + 1] + frame.data[i * 4 + 2]) / 3; frame.data[i * 4 + 0] = grey; frame.data[i * 4 + 1] = grey; frame.data[i * 4 + 2] = grey; } this.ctx1.putimagedata(frame, 0, 0); return; } }; once the page has loaded you can call processor.doload() result this is a pretty simple example showing how to manipulate video frames using a canvas.
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<img>: The Image Embed element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... the above example shows usage of the <img> element: the src attribute is required, and contains the path to the image you want to embed.
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<input type="checkbox"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...take the following example: <form> <div> <input type="checkbox" id="subscribenews" name="subscribe" value="newsletter"> <label for="subscribenews">subscribe to newsletter?</label> </div> <div> <button type="submit">subscribe</button> </div> </form> in this example, we've got a name of subscribe, and a value of newsletter.
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<input type="image"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... for example, if you have a graphical button that shows an image with an icon and/or image text "login now", you should also set the alt attribute to something like login now.
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<input type="month"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... when the above value is submitted to the server, for example, it will look like bday-month=1978-06.
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<link>: The External Resource Link element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... to link an external stylesheet, you'd include a <link> element inside your <head> like this: <link href="main.css" rel="stylesheet"> this simple example provides the path to the stylesheet inside an href attribute, and a rel attribute with a value of stylesheet.
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<textarea> - HTML: Hypertext Markup Language
the html <textarea> element represents a multi-line plain-text editing control, useful when you want to allow users to enter a sizeable amount of free-form text, for example a comment on a review or feedback form.
... the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
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Closures - JavaScript
lexical scoping consider the following example code: function init() { var name = 'mozilla'; // name is a local variable created by init function displayname() { // displayname() is the inner function, a closure alert(name); // use variable declared in the parent function } displayname(); } init(); init() creates a local variable called name and a function called displayname().
...this is an example of lexical scoping, which describes how a parser resolves variable names when functions are nested.
... closure consider the following code example: function makefunc() { var name = 'mozilla'; function displayname() { alert(name); } return displayname; } var myfunc = makefunc(); myfunc(); running this code has exactly the same effect as the previous example of the init() function above.
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Loops and iteration - JavaScript
for example, the idea "go five steps to the east" could be expressed this way as a loop: for (let step = 0; step < 5; step++) { // runs 5 times, with values of step 0 through 4.
... example in the example below, the function contains a for statement that counts the number of selected options in a scrolling list (a <select> element that allows multiple selections).
... example in the following example, the do loop iterates at least once and reiterates until i is no longer less than 5.
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eval() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...for example, suppose you have a variable x.
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Using the WebAssembly JavaScript API - WebAssembly
some simple examples let’s run through some examples that explain how to use the webassembly javascript api, and how to use it to load a wasm module in a web page.
... note: you can find the sample code in our webassembly-examples github repo.
... preparing the example first we need a wasm module!
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ContextMenus - Archive of obsolete content
<hbox id="container" align="center" oncontextmenu="..."> <label value="name:"/> <textbox id="name"/> </hbox> in this example, an attempt to open a context menu anywhere inside the hbox will call the event listener attached using the oncontextmenu attribute.
...this might be called while initializing a window during a load event for example.
... in the example, a context menu is attached to a grid.
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Filtering - Archive of obsolete content
for example, you wish the user to be able to select a value from a list, and the template results should be filtered based on that value.
...for example, the resulting triple for the netherlands might be: <triple subject="?photo" predicate="http://www.xulplanet.com/rdf/country" object="http://www.daml.org/2001/09/countries/iso#nl"/> this triple is then appended to the query.
...this example only adds one triple, but you could add others, or add <member> elements.
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Adding HTML Elements - Archive of obsolete content
here is an example as it might be added to the find file window: <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <window id="findfile-window" title="find files" orient="horizontal" xmlns:html="http://www.w3.org/1999/xhtml" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> then, you can use html tags as you would normally, keeping in mind ...
...this may be clearer from the examples below.
...some examples of using html elements are shown below.
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List Controls - Archive of obsolete content
for example, this list box will have four rows, one for each item.
... example 1 : source view <listbox> <listitem label="butter pecan" /> <listitem label="chocolate chip" /> <listitem label="raspberry ripple" /> <listitem label="squash swirl" /> </listbox> like with the html option element, you can assign a value for each item using the value attribute.
...the following example demonstrates these additional features: example 2 : source view <listbox rows="3"> <listitem label="butter pecan" value="bpecan" /> <listitem label="chocolate chip" value="chocchip" /> <listitem label="raspberry ripple" value="raspripple" /> <listitem label="squash swirl" value="squash" /> </listbox> the example has been changed to display only 3 rows at a time.
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Localization - Archive of obsolete content
the codes &lt; and &gt; are examples of entities which can be used to place less than and greater than signs into the text.
...the example below demonstrates the use of an entity in a button.
...(en-us.jar is the default for english.) you might have locale files in multiple languages, for example, us english (en-us) and french (fr).
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More Event Handlers - Archive of obsolete content
in the example below, currenttarget is always the vbox, whereas target would be the specific element, either the button or checkbox, that was activated.
... example 1 : source view <vbox oncommand="alert(event.currenttarget.tagname);"> <button label="ok"/> <checkbox label="show images"/> </vbox> stop event propagation once you handle an event, regardless of where in the propagation the event is, you will likely want to stop the event from being sent to further elements, essentially stopping the capturing or bubbling phases from continuing.
...to manually stop event propagation, call the event object's stoppropagation method, as in the following example.
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nsIContentPolicy - Archive of obsolete content
this interface can be very useful if you are developing a content-aware plugin (blocking ads or altering the look of content, for example), or if you want to stop or allow user-browsed urls.
... warning: do not block the caller in your implementations of shouldload() or shouldprocess() (for example, by launching a dialog to prompt the user for something).") note: in reality, much of this interface is defined in the nsicontentpolicybase interface, but for now is documented here until someone has time to split things up.
... type_image 3 indicates an image (for example, <img> elements).
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Gecko Compatibility Handbook - Archive of obsolete content
- some inline examples were removed because of technical limitations.
... they are actually replaced by ''-(example removed)-'' the goal of this handbook is to help you update websites to work with standards-based browsers and properly detect gecko.
...or use absolute paths in urls such as http://example.com/directory/...
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Getting started with CSS - Learn web development
in the text is a <span>span element</span> and also a <a href="http://example.com">link</a>.</p> <p>this is the second paragraph.
... it contains an <em>emphasized</em> element.</p> <ul> <li>item one</li> <li>item two</li> <li>item <em>three</em></li> </ul> </body> </html> note: if you are reading this on a device or an environment where you can't easily create files, then don't worry — live code editors are provided below to allow you to write example code right here in the page.
... changing the default behavior of elements when we look at a well-marked up html document, even something as simple as our example, we can see how the browser is making the html readable by adding some default styling.
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What is CSS? - Learn web development
this article explains what css is, with a simple syntax example, and also covers some key terms about the language.
...browsers, like firefox, chrome, or edge , are designed to present documents visually, for example, on a computer screen, projector or printer.
... css can be used for very basic document text styling — for example changing the color and size of headings and links.
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How do you upload your files to a web server? - Learn web development
summary if you have built a simple web page (see html basics for an example), you will probably want to put it online, on a web server.
... open the filezilla application; you should see something like this: logging in for this example, we'll suppose that our hosting provider (the service that will host our http web server) is a fictitious company "example hosting provider" whose urls look like this: mypersonalwebsite.examplehostingprovider.net.
... we have just opened an account and received this info from them: congratulations for opening an account at example hosting provider.
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From object to iframe — other embedding technologies - Learn web development
for bonus points, you could also try embedding a google map in the example: go to google maps and find a map you like.
...the live editable examples you've been using through this course are implemented using <iframe>s.
... wanted to include the mdn glossary on one of your web pages — you could try something like this: <iframe src="https://udn.realityripple.com/docs/glossary" width="100%" height="500" frameborder="0" allowfullscreen sandbox> <p> <a href="https://udn.realityripple.com/docs/glossary"> fallback link for browsers that don't support iframes </a> </p> </iframe> this example includes the basic essentials needed to use an <iframe>: allowfullscreen if set, the <iframe> is able to be placed in fullscreen mode using the full screen api (somewhat beyond scope for this article.) frameborder if set to 1, this tells the browser to draw a border between this frame and other frames, which is the default behaviour.
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Arrays - Learn web development
we'll return to this example later on in the article.
... as in previous articles, let's learn about the real basics of arrays by entering some examples into browser developer console.
...paste the following code into the console: let shopping = ['bread', 'milk', 'cheese', 'hummus', 'noodles']; shopping; in the above example, each element is a string, but in an array we can store various data types — strings, numbers, objects, and even other arrays.
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JavaScript object basics - Learn web development
object basics an object is a collection of related data and/or functionality (which usually consists of several variables and functions — which are called properties and methods when they are inside objects.) let's work through an example to understand what they look like.
...while working with this example you should have your developer tools javascript console open and ready to type in some commands.
... it is very common to create an object using an object literal when you want to transfer a series of structured, related data items in some manner, for example sending a request to the server to be put into a database.
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Introduction to cross browser testing - Learn web development
as an example, if you want to use cutting edge javascript features in your site, they might not work in older browsers.
...for example, if a site has been designed to look nice on a desktop pc, it will probably look tiny and be hard to read on a mobile device.
... so for example, you might be building an e-commerce site that serves customers in north america.
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Introducing a complete toolchain - Learn web development
toolchains and their inherent complexity as with any chain, the more links you have in your toolchain, the more complex and potentially brittle it is — for example it might be more complex to configure, and easier to break.
... for example, we could have included a tool to minimize our svg file sizes during build.
... your toolchain will depend on your own needs, but for this example of a (possible) complete toolchain, the tools that will be installed up front will be: library installation tools — for adding dependencies.
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Theme concepts
defining a theme to create a theme (in this example a simple, single image theme): create a folder in a suitable location on your computer.
...for example, we could use this image combined with a complementary background color, to create this effect in the header see details about this theme in the themes example weta_fade.
...you would use an empty or transparent image if, for example, you wanted to tile a centrally justified image, such as to create this effect here you specify the weta image like this: "images": { "theme_frame": "empty.png", "additional_backgrounds": [ "weta_for_tiling.png"] }, and the images tiling with: "properties": { "additional_backgrounds_alignment": [ "top" ], "additional_backgrounds_tiling": [ "repeat" ] }, full details of how to s...
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Chrome registration
toolbars, menu bars, progress bars, and window title bars are all examples of elements that are typically part of the chrome.
...if the above example had a packagename of camelcasepackage, you would get an error message similar to "no chrome registered for chrome://camelcasepackage/path/to/files".
...also, the path inside overridden files is relative to the overridden path, not the original one (this can be annoying and/or useful in css files, for example).
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How Mozilla's build system works
for example, a data structure defines which compiler to use, how to invoke it, which application features are enabled, and so on.
...for example, it says i want these c++ files compiled or look for additional information in these directories.
...for example, there is a tier for the netscape portable runtime (nspr), one for the javascript engine, one for the core gecko platform, one for the xul app being built, and so on.
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Performance best practices for Firefox front-end engineers
javascript code might, for example, change dom node attributes (either directly or by adding or removing classes from elements), and can also add, remove, or delete dom nodes.
... return window.getcomputedstyle(node).display; }); return display == "none"; } see detecting and avoiding synchronous reflow for a more advanced example of getting layout information, and then setting it safely, without causing flushes.
... here’s a simple example, cribbed from this blog post by paul rouget: div1.style.margin = "200px"; // line 1 var height1 = div1.clientheight; // line 2 div2.classlist.add("foobar"); // line 3 var height2 = div2.clientheight; // line 4 dosomething(height1, height2); // line 5 at line 1, we’re setting some style information on a dom node that’s going to result in a reflow - but (at just line 1...
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about:memory
single memory report files can also be loaded automatically when about:memory is loaded by appending a file query string, for example: about:memory?file=/home/username/reports.json.gz this is most useful when loading memory reports files obtained from a firefox os device.
...for example: 585 (100.0%) -- preference-service └──585 (100.0%) -- referent ├──493 (84.27%) ── strong └───92 (15.73%) -- weak ├──92 (15.73%) ── alive └───0 (00.00%) ── dead leaf nodes represent actual measurements; the value of each internal node is the sum of all its children.
...for example, preference/referent/weak/dead represents the path to the final leaf node in the example tree above.
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NSS Sample Code Sample1
this is an example program that demonstrates how to do key generation and transport between cooperating servers.
... we will add message protection (encryption and macing) examples to this program in the future.
... sample code #include <iostream.h> #include "pk11pub.h" #include "keyhi.h" #include "nss.h" // key management for keys share among multiple hosts // // this example shows how to use nss functions to create and // distribute keys that need to be shared among multiple servers // or hosts.
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Embedded Dialog API
an example of this can be found in the mfc embedding testbed application, in the method cmfcembedapp::initializewindowcreator (lxr link accurate at revision 1.20 of that file; search for the method name in later revisions).
...an mfc example is implemented in promptservice.cpp.
... a powerplant example is implemented in promptservice.cpp.
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Avoiding leaks in JavaScript XPCOM components
for example, if an object's constructor adds the object to a list that is reachable from a global variable and nothing ever removes it from the list, the object will never be destroyed since it is always reachable from the list.
...if you implement nsiobserver in javascript and register that observer (without using weak references) with a service (for example, with the observer service bug 239833 or with the pref service bug 256822), the service will do exactly what you tell it to do: notify the observer you just created until you unregister the observer.
...see one of the patches in bug 231384 for some examples.
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Creating the Component Code
in the subsequent chapters, we can begin to work on the example weblock component functionality itself.
... for example, mozilla_strict_api is a variable that shields you from certain private, non-xpcom headers.
... for example, including nsicomponentmanager.idl without mozilla_strict_api defined will include the following headers, which are not supported across versions (unfrozen): nscomponentmanagerutils.h nscomponentmanagerobsolete.h these variables are picked up by files that do not specify themselves as mozilla_strict_api.
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Mozilla internal string guide
for example: void nsfoo::reversecharacters(nsastring& str) { ...
...for example: // when passing a string to a method, use const nsastring& nsfoo::printstring(const nsastring &str); // when getting a string from a method, use nsastring& nsfoo::getstring(nsastring &result); the abstract classes are also sometimes used to store temporary references to objects.
... an example: const nsastring& str = getsomestring(); nsastring::const_iterator start, end; str.beginreading(start); str.endreading(end); constexpr auto valueprefix = u"value="_ns; if (findinreadable(valueprefix, start, end)) { // end now points to the character after the pattern valuestart = end; } checking for memory allocation failure the string classes now use infallible memory allocation,...
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nsILoginManager
for example, "http://www.bar.com".
...to not match any form logins (for example when interested in protocol logins only), specify null.
...to not match any protocol logins (for example when interested in form logins only), specify null.
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nsIProtocolHandler
if the protocol doesn't need a port (for example, the "about" protocol), this attribute is -1.
... constants constant value description uri_std 0 a standard full uri with authority component and understanding relative uris; this includes http and ftp, for example.
... uri_norelative 1<<0 the protocol doesn't support relative uris (for example, about and javascript).
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Using Objective-C from js-ctypes
a simple example is also in standard os libraries page.
... speech synthesis example let's start with the following objective-c code, which invokes the speech synthesis api to say "hello, firefox!".
... class objc_getclass(const char *name); in /usr/include/objc/objc.h, class is defined as an opaque type by the following: typedef struct objc_class *class; in this example, we need the classnsspeechsynthesizer, which is retrieved with the following code: class nsspeechsynthesizer = objc_getclass("nsspeechsynthesizer"); registering a selector selectors can be registered and retrieved with sel_registername function, also declared in /usr/include/objc/runtime.h.
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Using the CSS Typed Object Model - Web APIs
let's see how this works by creating our first example, which explores computedstylemap().
... <p> <a href="https://example.com">link</a> </p> <dl id="regurgitation"></dl> we add javascript to grab our unstyled link and return back a definition list of all the default css property values impacting the link using computedstylemap().
... .get() method / custom properties let's update our example to only retrieve a few properties and values.
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EventTarget.addEventListener() - Web APIs
for example, an event handler callback that can be used to handle both fullscreenchange and fullscreenerror might look like this: function eventhandler(event) { if (event.type == 'fullscreenchange') { /* handle a full screen toggle */ } else /* fullscreenerror */ { /* handle a full screen toggle error */ } } safely detecting option support in older versions of the dom specification, the thir...
... for example, if you want to check for the passive option: let passivesupported = false; try { const options = { get passive() { // this function will be called when the browser // attempts to access the passive property.
... examples add a simple listener this example demonstrates how to use addeventlistener() to watch for mouse clicks on an element.
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MediaDevices.getUserMedia() - Web APIs
that stream can include, for example, a video track (produced by either a hardware or virtual video source such as a camera, video recording device, screen sharing service, and so forth), an audio track (similarly, produced by a physical or virtual audio source like a microphone, a/d converter, or the like), and possibly other track types.
...here's a full example: { audio: true, video: { width: { min: 1024, ideal: 1280, max: 1920 }, height: { min: 576, ideal: 720, max: 1080 } } } an ideal value, when used, has gravity, which means that the browser will try to find the setting (and camera, if you have more than one), with the smallest fitness distance from the ideal values given.
... plain values are inherently ideal, which means that the first of our resolution examples above could have been written like this: { audio: true, video: { width: { ideal: 1280 }, height: { ideal: 720 } } } not all constraints are numbers.
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WebGL best practices - Web APIs
for example, if you never want to access your shader objects directly again, just delete their handles after attaching them to a program object.
... for example, it is possible for the following to never complete without context loss: sync = glfencesync(gl_sync_gpu_commands_complete, 0); glclientwaitsync(sync, 0, gl_timeout_ignored); webgl doesn't have a swapbuffers call by default, so a flush can help fill the gap, as well.
... for example, within firefox, the only time glgeterror is checked is after allocations (bufferdata, *teximage*, texstorage*) to pick up any gl_out_of_memory errors.
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ARIA: button role - Accessibility
<div id="savechanges" tabindex="0" role="button" aria-pressed="false">save</div> the above example creates a simple button which is first in the focus order, though <button> or <input> with type="button" should be used for buttons: <button id="savechanges">save</button> note: if using role="button" instead of the semantic <button> or <input type="button"> elements, you will need to make the element focusable and have to define event handlers for click and keydown events, including the enter and space keys,...
...see the official wai-aria example code.
...in some cases, for example buttons represented by icons, the accessible name may be provided from the aria-label or aria-labelledby attributes.
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Keyboard-navigable JavaScript widgets - Accessibility
tabindex="33") yes tabindex value determines where this element is positioned in the tab order: smaller values will position elements earlier in the tab order than larger values (for example, tabindex="7" will be positioned before tabindex="11").
...(for a full description of the keyboard support that is normally expected for typical widgets, see the wai-aria authoring practices.) the example below shows this technique used with a nested menu control.
... example 2: a menu control using tabindex to control keyboard access <ul id="mb1" tabindex="0"> <li id="mb1_menu1" tabindex="-1"> font <ul id="fontmenu" title="font" tabindex="-1"> <li id="sans-serif" tabindex="-1">sans-serif</li> <li id="serif" tabindex="-1">serif</li> <li id="monospace" tabindex="-1">monospace</li> <li id="fantasy" tabindex="-1">fantasy</li> </ul> </li> <li id="mb1_menu2" tabindex="-1"> style <ul id="stylemenu" title="style" tabindex="-1"> <li id="italic" tabindex="-1">italics</li> <li id="...
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Basic concepts of flexbox - CSS: Cascading Style Sheets
you can see in the live example below how this looks.
... the live example below has flex-direction set to row-reverse.
... in the live example below try changing the first value to one of the allowable values for flex-direction - row, row-reverse, column or column-reverse, and also change the second to wrap and nowrap.
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Mastering Wrapping of Flex Items - CSS: Cascading Style Sheets
in the next example i have ten items all with a flex-basis of 160px and the ability to grow and shrink.
... single-dimensional layout explained as we have seen from the above examples if our items are allowed to grow and shrink, when there are fewer items in the last row or column then those items grow to fill the available space.
...we can compare our wrapped row example above with the css grid version of that layout to see the difference.
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Typical use cases of Flexbox - CSS: Cascading Style Sheets
it forms the most simple of flexbox examples, and could be considered the ideal flexbox use case.
... in the below live example we display the items at their natural size and by using justify-content: space-between make equal amounts of space between the items.
... in the live example below try changing flex: auto to flex: 1.
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Auto-placement in CSS Grid Layout - CSS: Cascading Style Sheets
der: 2px solid #ffa94d; border-radius: 5px; background-color: #ffd8a8; padding: 1em; color: #d9480f; } .wrapper { display: grid; grid-template-columns: repeat(3, 1fr); grid-gap: 10px; } <div class="wrapper"> <div>one</div> <div>two</div> <div>three</div> <div>four</div> <div>five</div> </div> default rules for auto-placement as you can see with the above example, if you create a grid all child items will lay themselves out one into each grid cell.
...to cause all created rows to be 100 pixels tall for example you would use: * {box-sizing: border-box;} .wrapper { border: 2px solid #f76707; border-radius: 5px; background-color: #fff4e6; } .wrapper > div { border: 2px solid #ffa94d; border-radius: 5px; background-color: #ffd8a8; padding: 1em; color: #d9480f; } <div class="wrapper"> <div>one</div> <div>two</div> <div>three</div> <div>four</div> <...
... in this next example i have created a grid with three row tracks of 200 pixels height.
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Subgrid - CSS: Cascading Style Sheets
for example, if you use grid-template-columns: subgrid and the nested grid spans three column tracks of the parent, the nested grid will have three column tracks of the same size as the parent grid.
... subgrid for columns in the example below i have a grid layout with nine 1fr column tracks and four rows that are a minimum of 100px tall.
... the rows in this example are not a subgrid and so behave as a nested grid does normally.
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Basic Shapes - CSS: Cascading Style Sheets
we will cover these in the examples below.
... .shape { shape-outside: circle(50%) margin-box; } you can therefore change this in order that your shape uses the different parts of the box model, for example to use the border.
...we will see this in the following examples of basic shapes.
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Visual formatting model - CSS: Cascading Style Sheets
user agents can change the layout of the page when the viewport size changes — for example, if you resize your window, or change the orientation of a mobile device.
... some elements may generate additional boxes in addition to the principal box, for example display: list-item generates more than one box (e.g.
...this situation happens when, for example, you declare display: flex on a parent element, and directly inside there is a run of text not contained in another element.
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Getting Started - Developer guides
this article guides you through the ajax basics and gives you some simple hands-on examples to get you started.
...for a more realistic example, see step 3 of this article.
...}; next, after declaring what happens when you receive the response, you need to actually make the request, by calling the open() and send() methods of the http request object, like this: httprequest.open('get', 'http://www.example.org/some.file', true); httprequest.send(); the first parameter of the call to open() is the http request method – get, post, head, or another method supported by your server.
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<audio>: The Embed Audio element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... the above example shows simple usage of the <audio> element.
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<input type="date"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...for example: var datecontrol = document.queryselector('input[type="date"]'); datecontrol.value = '2017-06-01'; console.log(datecontrol.value); // prints "2017-06-01" console.log(datecontrol.valueasnumber); // prints 1496275200000, a unix timestamp this code finds the first <input> element whose type is date, and sets its value to 2017-06-01 (june 1st, 2017).
...And 8 more matches

<input type="week"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...when the above value is submitted to the server, for example, browsers may display it as week 01, 2017, but the submitted value will always look like week=2017-w01.
...And 8 more matches

<video>: The Video Embed element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... the above example shows simple usage of the <video> element.
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HTML documentation index - HTML: Hypertext Markup Language
for example, it can be used to hide elements of the page that can't be used until the login process has been completed.
...this attribute and the <style> element have mainly the purpose of allowing for quick styling, for example for testing purposes.
... 70 <big>: the bigger text element element, html, obsolete, reference, web the obsolete html big element (<big>) renders the enclosed text at a font size one level larger than the surrounding text (medium becomes large, for example).
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Browser detection using the user agent - HTTP
an example of feature detection is as follows.
...for example, in the above code snippets, using lookbehind in short-regexp notation (e.g.
...thus, in the above example, you would use new regexp("(?<=look_behind_stuff)"); instead of /(?<=look_behind_stuff)/, even in the lookbehind supported section of your code.
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Using HTTP cookies - HTTP
typically, it's used to tell if two requests came from the same browser — keeping a user logged-in, for example.
... get /sample_page.html http/2.0 host: www.example.org cookie: yummy_cookie=choco; tasty_cookie=strawberry note: here's how to use the set-cookie header in various server-side applications: php node.js python ruby on rails define the lifetime of a cookie the lifetime of a cookie can be defined in two ways: session cookies are deleted when the current session ends.
... for example: set-cookie: id=a3fwa; expires=wed, 31 oct 2021 07:28:00 gmt; note: when an expires date is set, the time and date set is relative to the client the cookie is being set on, not the server.
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Control flow and error handling - JavaScript
the block is delimited by a pair of curly brackets: { statement_1; statement_2; ⋮ statement_n; } example block statements are commonly used with control flow statements (if, for, while).
...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.
... for example, do not write code like this: // prone to being misread as "x == y" if (x = y) { /* statements here */ } if you need to use an assignment in a conditional expression, a common practice is to put additional parentheses around the assignment, like this: if ((x = y)) { /* statements here */ } falsy values the following values evaluate to false (also known as falsy values): false undef...
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Function.prototype.apply() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...with apply, you can also use an array literal, for example, func.apply(this, ['eat', 'bananas']), or an array object, for example, func.apply(this, new array('eat', 'bananas')).
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Promise - JavaScript
these methods also return a newly generated promise object, which can optionally be used for chaining; for example, like this: const mypromise = (new promise(myexecutorfunc)) .then(handlefulfilleda,handlerejecteda) .then(handlefulfilledb,handlerejectedb) .then(handlefulfilledc,handlerejectedc); // or, perhaps better ...
...(see throw -999 in the example, below, for a technique to handle the consequences.) on the other hand, in the absence of an immediate need, it is simpler to leave out error handling until a final .catch() statement.
... examples basic example let myfirstpromise = new promise((resolve, reject) => { // we call resolve(...) when what we were doing asynchronously was successful, and reject(...) when it failed.
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Authoring MathML - MathML
it's recommended to convert your content mathml markup into presentation mathml before publishing it, for example with the help of the ctop.xsl stylesheet.
...for example the following function verifies the mathml support by testing the mspace element (you may replace mspace with mpadded): function hasmathmlsupport() { var div = document.createelement("div"), box; div.innerhtml = "<math><mspace height='23px' width='77px'/></math>"; document.body.appendchild(div); box = div.firstchild.firstchild.getboundingclientrect(); document.body.removechild(div); ...
...for example, here is a minimal stylesheet to use latin modern for the text and latin modern math for the mathematics: @namespace url('http://www.w3.org/1999/xhtml'); @namespace m url('http://www.w3.org/1998/math/mathml'); body, m|mtext { font-family: latin modern; } m|math { font-family: latin modern math; } you can then use the @font-face rule as usual to provide woff fallback for latin modern an...
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Web video codec guide - Web media technologies
in the example image above, note how the sky has bands of different shades of blue, instead of being a consistent gradient as the sky color changes toward the horizon.
... mosquito noise artifacts are most commonly found in mpeg video, but can occur whenever a discrete cosine transform (dct) algorithm is used; this includes, for example, jpeg still images.
... for example, level av1 level 2.0 offers a maximum frame width of 2048 pixels and a maximum height of 1152 pixels, but its maximum frame size in pixels is 147,456, so you can't actually have a 2048x1152 video at level 2.0.
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Structural overview of progressive web apps - Progressive web apps (PWAs)
the most popular approach is the app shell concept, which mixes ssr and csr in exactly the way described above, and in addition follows the "offline first" methodology which we will explain in detail in upcoming articles and use in our example application.
...for example, an offline mode with the help of service workers is just an extra trait that makes the website experience better, but it's still perfectly usable without it.
...if you want to perform an operation on the data (for example, adding a filter to a video), you no longer need to wait for all of it to be downloaded and converted to a blob (or whatever).
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Paths - SVG: Scalable Vector Graphics
each of the commands is instantiated (for example, creating a class, naming and locating it) by a specific letter.
...for example: m x y (or) m dx dy in the following example there's only a point at (10,10).
...for example: <svg width="200" height="200" xmlns="http://www.w3.org/2000/svg"> <path d="m10 10"/> <!-- points --> <circle cx="10" cy="10" r="2" fill="red"/> </svg> there are three commands that draw lines.
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context-menu - Archive of obsolete content
for example, if your add-on needs to add a context menu item whenever the user visits a certain page, don't create the item when that page loads, and don't remove it when the page unloads.
... for example, a good use of the menu would be to show an "edit image" item when the user right-clicks an image in the page.
...for example: var context = require("sdk/context-menu").selectorcontext("img"); mymenuitem.context.add(context); mymenuitem.context.remove(context); when a menu item is bound to more than one context, it appears in the menu when all of those contexts occur.
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Bootstrapped extensions - Archive of obsolete content
there are several scenarios in which the startup() function may be called; for example: when the extension is first installed, assuming that it's both compatible with the application and is enabled.
... some examples of when the shutdown() function may be called: when the extension is uninstalled, if it's currently enabled.
... not all chrome.manifest instructions are supported in bootstrapped add-ons, for example you still cannot register xul overlays from a bootstrapped add-on.
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MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
abstract this document is a concrete example of a centralized auto-configuration of mozilla apps, that are; firefox, thunderbird, mozilla suite 1.x.x, seamonkey and for the record, old netscape 4.x.
... file location (not tested since 2012 ...) in thunderbird , firefox, the javascript preference file that calls the centralized preference file is located in $install_dir_moz_app/defaults/pref, for example in thunderbird this would be repectively for windows/linux: c:\program files\mozilla thunderbird\defaults\pref /usr/lib/thunderbird/default/pref ( it used to be in /usr/lib/thunderbird-version#/default/pref as in /usr/lib/thunderbird-5/default/pref ) for the record/history purpose ...
... that prefcalls.js is now archive in omni.jar file located at the root of the mozilla apps installation, example of tb5: # jar -tvf /usr/lib/thunderbird/omni.jar | grep prefcalls.js 7499 sat nov 05 09:21:34 cet 2011 defaults/autoconfig/prefcalls.js traditionally (previous apps versions) is was in mozilla_home/default/autoconfig/prefcalls.js.
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Reading from Files - Archive of obsolete content
var file = io.getfile("home", "sample.txt"); var stream = io.newinputstream(file, "text"); this example first retrieves a file object using nsiscriptableio.getfile().
...the newinputstream method takes two arguments in this example.
...var file = io.getfile("home", "sample.txt"); var stream = io.newinputstream(file, "text"); var str = stream.readstring(20); stream.close(); in this example, a text input stream is created for the file 'sample.txt'.
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Adding Properties to XBL-defined Elements - Archive of obsolete content
the example below creates a button which generates and stores a random number.
...in this example, no content has been placed inside either the xul box or its definition in xbl, which is perfectly valid.
... this example isn't quite correct because the field is not assigned a default value.
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Advanced Rules - Archive of obsolete content
in the example above, the value of the container attribute is the variable 'list'.
...of course, the example above doesn't have any content.
...for example, a triple exists between a bookmark and its url.
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Custom Tree Views - Archive of obsolete content
the following example shows this: <tree id="my-tree" flex="1"> <treecols> <treecol id="namecol" label="name" flex="1"/> <treecol id="datecol" label="date" flex="1"/> </treecols> <treechildren/> </tree> to assign data to be displayed in the tree, the view object needs to be created which is used to indicate the value of each cell, the total number of rows plus other optional information.
... here is an example of defining such as object, which can be called whatever you want: //moz 1.8 var treeview = { rowcount : 10000, getcelltext : function(row,column){ if (column.id == "namecol") return "row "+row; else return "february 18"; }, settree: function(treebox){ this.treebox = treebox; }, iscontainer: function(row){ return false; }, isseparator: function(row){ return fa...
...lse; }, issorted: function(){ return false; }, getlevel: function(row){ return 0; }, getimagesrc: function(row,col){ return null; }, getrowproperties: function(row,props){}, getcellproperties: function(row,col,props){}, getcolumnproperties: function(colid,col,props){} }; the functions in the example not described above do not need to perform any action, but they must be implemented as the tree calls them to gather additional information.
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Manipulating Lists - Archive of obsolete content
here is an example: example 1 : source view <script> function additem(){ document.getelementbyid('thelist').appenditem("thursday", "thu"); } </script> <listbox id="thelist"/> <button label="add" oncommand="additem();"/> the appenditem() takes two arguments, the label, in this case 'thursday', and a value 'thu'.
...the new item is inserted at this index, so, in the example, the new item will be added at position 3 while the item previously at that position will now be at position 4.
...for example, to add a new item to a menulist, you can use the same syntax as for a listbox.
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Modifying a XUL Interface - Archive of obsolete content
for example, the following will add a button to a xul window: example 1 : source view <script> function addbutton(){ var abox = document.getelementbyid("abox"); var button = document.createelement("button"); button.setattribute("label","a new button"); abox.appendchild(button); } </script> <box id="abox" width="200"> <button label="add" oncommand="addbutton();"/> </box> this example has two pa...
...here is an example: example 2 : source view <hbox height="400"> <button label="copy" oncommand="this.parentnode.appendchild(this.nextsibling.clonenode(true));"/> <vbox> <button label="first"/> <button label="second"/> </vbox> </hbox> when the copy button is pressed..
...label and value properties examples here is a simple example which changes the label on a button: example 3 : source view <button label="hello" oncommand="this.label = 'goodbye';"/> when the button is pressed, the label is changed.
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More Menu Features - Archive of obsolete content
the example below creates a simple submenu inside the file menu example 1 : source view <toolbox flex="1"> <menubar id="sample-menubar"> <menu id="file-menu" label="file"> <menupopup id="file-popup"> <menu id="new-menu" label="new"> <menupopup id="new-popup"> <menuitem label="window"/> <menuitem label="message"/> </menupopup> </menu>...
... <menuitem label="open"/> <menuitem label="save"/> <menuseparator/> <menuitem label="exit"/> </menupopup> </menu> </menubar> </toolbox> adding a menu to our find files example let's add a menu to the find files dialog.
...this is similar to the example above.
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Popup Menus - Archive of obsolete content
a good example is the drop down menu that appears when you click on the little down arrows next to the back and forward buttons in a browser window.
...on the macintosh for example, the user can either press the control key and click the mouse button, or hold the mouse button down for a moment.
... also note that it is possible to open context menus without using the mouse, for example by pressing the menu key on a keyboard.
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XPCOM Interfaces - Archive of obsolete content
for example, if we wanted to create a mail application, we would need to write scripts which would connect to mail servers to retrieve and send mail.
...for example, there is a component for each menu, button and element.
... let's take an example of a file component.
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XUL Structure - Archive of obsolete content
for instance, an http url does not have any special privileges, and an error will occur if a web page tries, for example, to read a local file.
...for example, while the form controls on an html page are accessible via the document.forms property, this property isn't available for xul documents, since xul doesn't have forms in the html sense.
...for example, the messenger component has descriptions of the mail messages list window, the composition window and the address book dialogs.
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Writing Skinnable XUL and CSS - Archive of obsolete content
for example, the skin for the navigator package should contain a file called navigator.css that determines the default look of all xul windows posed from this package.
...for example, the sidebar should not import the global skin, since it could appear in messenger and in navigator (which could have two completely different color schemes).
...below are examples for each case.
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XUL accessibility guidelines - Archive of obsolete content
the firefox "bookmarks manager" provides an example of how to make trees more accessible.
...the arrowscrollbox, for example, is a non-focusable element and cannot be scrolled using a keyboard.
... the following example shows a javascript function that can be called before destroying an element to check for focus and move it if necessary.
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Common causes of memory leaks in extensions - Extensions
for example, in xul overlay code: var contentwindows = []; function inbrowserxuloverlay(contentwindow) { // forgetting or failing to pop the content window thing again contentwindows.push(contentwindow); } this will keep the content window compartments alive until the browser window is closed.
... for example: var windows = []; function injavascriptcodemodule(window) { // forgetting or failing to pop the window again windows.push(window); } both of these cases can happen if you forget to declare local variables with var or let, which means they end up belonging to the global scope.
... for example: function implicitdeclarationleak(window) { // implicit variable declaration in the js global, holding a strong ref to the document doc = window.document; } implicitly declared variables can be avoided by using ecmascript 5's strict mode.
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Debugging CSS - Learn web development
for example in firefox there are some excellent tools for working visually with css layout, allowing you to inspect and edit grid layouts, flexbox, and shapes.
...in order to do so i'll be using an example file.
...in our example the margin shorthand is used.
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Multiple-column layout - Learn web development
a basic example we will now explore how to use multiple-column layout, often referred to as multicol.
...at the bottom of the section you can see a live example of what the final code should look like.
... column-count example body { width: 90%; max-width: 900px; margin: 2em auto; font: .9em/1.2 arial, helvetica, sans-serif; } <div class="container"> <h1>simple multicol example</h1> <p> lorem ipsum dolor sit amet, consectetur adipiscing elit.
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Styling links - Learn web development
focus: a link when it has been focused (for example moved to by a keyboard user using the tab key or similar, or programmatically focused using htmlelement.focus()) — this is styled using the :focus pseudo class.
... default styles the following example illustrates what a link will behave like by default (the css is simply enlarging and centering the text to make it stand out more.) <p><a href="#">a simple link</a></p> p { font-size: 2rem; text-align: center; } note: all the links in the examples in this page are fake links — a # (hash, or pound sign) is put in place of the real url.
... this is because if the real links were included, clicking on them would break the examples (you'd end up with an error, or a page loaded in the embedded example that you couldn't get back from.) # just links to the current page.
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Other form controls - Learn web development
note: you can find a slightly more interesting example of text area usage in the example we put together in the first article of the series (see the source code also).
... block and inline: experimental values that allow resizing in the block or inline direction only (this varies depending on the directionality of your text; read handling different text directions if you want to find out more.) play with the interactive example at the top of the resize reference page for a demonstration of how these work.
... note: you can find examples of all the drop-down box types on github at drop-down-content.html (see it live also).
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Website security - Learn web development
other attacks can be mitigated through your web server configuration, for example by enabling https.
... for example, consider a site search function where the search terms are encoded as url parameters, and these terms are displayed along with the results.
... for example, a discussion board that accepts comments that contain unmodified html could store a malicious script from an attacker.
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Introduction to automated testing - Learn web development
for example, this could be every time you save a file, or at some other point.
... for example, let's first create a test directory to allow us to play without fear of breaking anything.
...for example, try adding the following to the bottom of your gulpfile.js: gulp.task('watch', function(){ gulp.watch('src/*.html', ['html']); gulp.watch('src/*.css', ['css']); gulp.watch('src/*.js', ['js']); }); now try entering the gulp watch command into your terminal.
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SVG Guidelines
for example, consider an image of a path with a gradient fill.
...these rules are based on some real examples seen in mozilla's code.
...no useless whitespaces or line breaks (see below for more details) adding a license header use double quotes whitespace and line breaks whitespace in addition to trailing whitespace at the end of lines, there are a few more cases more specific to svgs: trailing whitespaces in attribute values (usually seen in path definitions) excessive whitespace in path or polygon points definition examples this path: <path d=" m5,5 l1,1z "> can be cut down to this: <path d="m5,5 l1,1z"> similarly, this polygon: <polygon points=" 0,0 4,4 4,0 "/> can be cut down to this: <polygon points="0,0 4,4 4,0"/> line breaks you should only use line breaks for logical separation or if they help make the file readable.
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Script security
for example, the objects associated with a document served from https://example.org/ can access each other, and they can also access objects served from https://example.org/foo.
...for example, code served from https://example.org/ trying to access objects from https://somewhere-else.org/ will have restricted access.
...an example of this scope is chrome-privileged javascript accessing web content.
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Sqlite.jsm
here is an example: components.utils.import("resource://gre/modules/sqlite.jsm"); try { const conn = await sqlite.openconnection({ path: "mydatabase.sqlite", sharedmemorycache: false }); // connection is the opened sqlite connection (see below for api).
... examples open, execute, close in this example, we open a connection, execute a simple statement, then close the connection.
... const conn = await sqlite.openconnection({path: "mydb.sqlite"}); const result = await conn.execute("select 1"); await conn.close(); alert("we are done!"); this isn't a terrific example because it doesn't include error handling.
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AsyncTestUtils extended framework
mozmill is an example of a testing framework that uses a nested event loop.
...for example, you would do "yield async_move_messages(...);" and be done with it.
...for example, if you pass 3, then 1 <- 2 <- 3 is what the reply chain looks like.
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nss tech note5
ck_mechanism_type ciphermech = ckm_des_cbc_pad <big>(for example)</big> choose a slot on which to to do the operation pk11slotinfo* slot = pk11_getbestslot(ciphermech, null); or pk11slotinfo* slot = pk11_getinternalkeyslot(); /* alwys returns internal slot, may not be optimal */ prepare the key if using a raw key /* turn the raw key into a secitem */ secitem keyitem; keyitem.data = /* ptr to an array of key byte...
... ck_mechanism_type digestmech = ckm_md5 <big>(for example)</big> choose a slot on which to to do the operation pk11slotinfo* slot = pk11_getbestslot(digestmech, null); or pk11slotinfo* slot = pk11_getinternalkeyslot(); /* always returns int slot, may not be optimal */ prepare the key if using a raw key /* turn the raw key into a secitem */ secitem keyitem; keyitem.data = /* ptr to an array of key bytes */...
...you can find a list of hmac mechanisms in security/nss/lib/softoken/pkcs11.c - grep for ckf_sn_vr, and choose the mechanisms that contain hmac in the name ck_mechanism_type hmacmech = ckm_md5_hmac; <big>(for example)</big> choose a slot on which to to do the operation pk11slotinfo* slot = pk11_getbestslot(hmacmech, null); or pk11slotinfo* slot = pk11_getinternalkeyslot(); /* always returns int slot, may not be optimal */ prepare the key if using a raw key /* turn the raw key into a secitem */ secitem keyitem; keyitem.type = sibuffer; keyitem.data = /* ...
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Using XPCOM Utilities to Make Things Easier
for example: ns_impl_isupports2(classname, interface1, interface2) ns_impl_isupportsn(classname, interface1, ..., interfacen) these macros automatically add the nsisupports entry for you, so you don't need to do something like this: ns_impl_isupports2(classname, interface1, nsisupports) take a close look at the above example.
...for example, ns_decl_nsifoo will declare all of the methods of nsifoo provided that it exists and that nsifoo.h was generated by the xpidl compiler.
...in c++, the string literal "xpcom", for example, consists of 6 consecutive bytes, where `x' is at byte offset zero and a null character is at byte offset 5.
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XUL Overlays
overlays provide a general mechanism for: adding ui for additional components, as described in the example above overriding small pieces of a xul file without having to resupply the whole ui reusing particular pieces of the ui xul files and overlays work together to describe a single master document.
...the installation of a media plug-in, for example, may add new icons and menu items to the interface: in the navigatoroverlay.xul file or in a separate navigatorsspoverlay.xul file (where navigator.xul defines the basic ui for the navigator package), these new plug-in elements would be defined as a collection of elements or subtrees: <menuitem name="super stream player"/> <menupopup name="ss favorites"> <menuitem name="wave" src="mavericks.ss...
...when a component such as the "super stream player" from the examples above is registered there, overlays associated with that component are loaded automatically.
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Xray vision
the security machinery in gecko ensures that there's asymmetric access between code at different privilege levels: so for example, content code can't access objects created by chrome code, but chrome code can access objects created by content.
... for example: window.confirm() is a dom api that's supposed to ask the user to confirm an action, and return a boolean depending on whether they clicked "ok" or "cancel".
... so in the example above, chrome code calling the content's window.confirm() would get the original version of confirm(), not the redefined version.
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Autoconfiguration in Thunderbird
for more complicated setups, for example when the login name does not appear in the email address, the xml file can also be generated by the isp.
...for example, for the email address fred@example.com , the lookup is performed as (in this order): tb-install-dir/isp/example.com.xml on the harddisk check for autoconfig.example.com look up of "example.com" in the ispdb look up "mx example.com" in dns, and for mx1.mail.hoster.com, look up "hoster.com" in the ispdb try to guess (imap.example.com, smtp.example.com etc.) we may add dns srv records as s...
... how to add support for your domain classification if you are a big isp (> 100,000 users) providing email addresses solely under a few domains like "example.com" and "example.de", you may either submit the configuration to the ispdb or set up a configuration server.
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Mozilla
toolbars, menu bars, progress bars, and window title bars are all examples of elements that are typically part of the chrome.
...so for example, on kde is is desirable to fully employ the kde wallet manager, rather than any secondary replacements of kdewallet.
...here is a very simple example of the observer pattern: creating mozsearch plugins firefox 2 uses a simplified form of the opensearch format for storing search plugins.
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Initialization and Destruction - Plugins
this chapter ends with initialize and shutdown example, which includes the np_initialize and np_shutdown methods.
...for an example that shows the use of both the np_initialize and np_shutdown methods, see initialize and shutdown example.
... the arguments in the embed element are name-value pairs made up of the attribute name (for example, align) and its value (for example, top).
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Index - Firefox Developer Tools
to enable it, open the developer tool settings, and check the "memory" box under "default firefox developer tools": 40 dom allocation example this article describes a very simple web page that we'll use to illustrate some features of the memory tool.
... 43 monster example this article describes a very simple web page that we'll use to illustrate some features of the memory tool.
... 46 network monitor debugging, dev tools, firefox, guide, networking, tools, l10n:priority the network monitor shows you all the network requests firefox makes (for example, when it loads a page, or due to xmlhttprequests), how long each request takes, and details of each request.
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console - Web APIs
for example: console.log("failed to open the specified link") this page documents the methods available on the console object and gives a few usage examples.
... console.profile() starts the browser's built-in profiler (for example, the firefox performance tool).
...you can see the resulting profile in the browser's performance tool (for example, the firefox performance tool).
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Using files from web applications - Web APIs
example: showing file(s) size the following example shows a possible use of the size property: <!doctype html> <html> <head> <meta charset="utf-8"> <title>file(s) size</title> </head> <body> <form name="uploadform"> <div> <input id="uploadinput" type="file" name="myfiles" multiple> selected files: <span id="filenum">0</span>; total size: <span id="filesize">0</span> </d...
...exactly what part of your content will accept drops may vary depending on the design of your application, but making an element receive drop events is easy: let dropbox; dropbox = document.getelementbyid("dropbox"); dropbox.addeventlistener("dragenter", dragenter, false); dropbox.addeventlistener("dragover", dragover, false); dropbox.addeventlistener("drop", drop, false); in this example, we're turning the element with the id dropbox into our drop zone.
... example: showing thumbnails of user-selected images let's say you're developing the next great photo-sharing website and want to use html to display thumbnail previews of images before the user actually uploads them.
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Streams API - Web APIs
for example, the response body returned by a successful fetch request can be exposed as a readablestream, and you can then read it using a reader created with readablestream.getreader(), cancel it with readablestream.cancel(), etc.
... more complicated uses involve creating your own stream using the readablestream() constructor, for example to process data inside a service worker.
... examples we have created a directory of examples to go along with the streams api documentation — see mdn/dom-examples/streams.
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Synchronous and asynchronous requests - Web APIs
example: send a file to the console log this is the simplest usage of asynchronous xmlhttprequest.
... example: writing a function to read an external file in some cases, you must read many external files.
... example: using a timeout you can use a timeout to prevent your code from hanging while waiting for a read to finish.
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CSS Box Alignment - CSS: Cascading Style Sheets
basic examples the following examples demonstrate how some of the box alignment properties are applied in grid and flexbox.
... css grid layout alignment example in this example using grid layout, there is extra space in the grid container after laying out the fixed width tracks on the inline (main) axis.
... flexbox alignment example in this example, three flex items are aligned on the main axis using justify-content and on the cross axis using align-items.
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Grid template areas - CSS: Cascading Style Sheets
for example, if i wish to create the layout shown below i can identify four main areas.
... leaving a grid cell empty we have completely filled our grid with areas in this example, leaving no white space.
... spanning multiple cells in our example each of the areas spans multiple grid cells and we achieve this by repeating the name of that grid area multiple times with white space between.
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Logical properties for sizing - CSS: Cascading Style Sheets
logical property physical property inline-size width block-size height min-inline-size min-width min-block-size min-height max-inline-size max-width max-block-size max-height width and height example the logical mappings for width and height are inline-size, which sets the length in the inline dimension and block-size, which sets the length in the block dimension.
... in the live example below i have set the writing mode to horizontal-tb.
... change it to vertical-rl and you will see that the first example — which uses width and height — remains the same size in each dimension, despite the text becoming vertical.
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background-position - CSS: Cascading Style Sheets
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... (container width - image width) * (position x%) = (x offset value) (container height - image height) * (position y%) = (y offset value) using the x axis for an example, let's say we have an image that is 300px wide and we are using it in a container that is 100px wide, with background-size set to auto: 100px - 300px = -200px (container & image difference) so that with position percentages of -25%, 0%, 50%, 100%, 125%, we get these image-to-container edge offset values: -200px * -25% = 50px -200px * 0% = 0px -200px * 50% = -100px -200px * 100...
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Event reference
this article offers a list of events that can be sent; some are standard events defined in official specifications, while others are events used internally by specific browsers; for example, mozilla-specific events are listed so that add-ons can use them to interact with the browser.
... error a websocket connection has been closed with prejudice (some data couldn't be sent for example).
... emptied the media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
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Audio and Video Delivery - Developer guides
.onload = function() { context.decodeaudiodata(request.response, function(buffer) { source = context.createbuffersource(); source.buffer = buffer; source.connect(context.destination); // auto play source.start(0); // start was previously noteon }); }; request.send(); } catch(e) { alert('web audio api not supported'); } in this example we retrieve an mp3 file via xhr, load it into a source and play it (try it for yourself).
...you can also choose how to make your player responsive — for example you might remove the progress bar under certain conditions.
... a quick example — first set up your audio and custom controls in html: <audio id="my-audio" src="http://jplayer.org/audio/mp3/miaow-01-tempered-song.mp3"></audio> <button id="my-control">play</button> add a bit of javascript to detect events to play and pause the audio: window.onload = function() { var myaudio = document.getelementbyid('my-audio'); var mycontrol = document.getelementbyid('my-control'); function switchstate() { if (myaudio.paused == true) { myaudio.play(); mycontrol.innerhtml = "pause"; } else { myaudio.pause(); mycontrol.innerhtml = "pl...
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<input type="radio"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... for example, if your form needs to ask the user for their preferred contact method, you might create three radio buttons, each with the name property set to contact but one with the value email, one with the value phone, and one with the value mail.
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<input type="text"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... see specifying a pattern for further details and an example.
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<sup>: The Superscript element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... for example, to style the wordmark of a business or product which uses a raised baseline should be done using css (most likely vertical-align) rather than <sup>.
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itemprop - HTML: Hypertext Markup Language
examples the example below shows the source for a set of elements marked up with itemprop attributes, followed by a table showing the resulting structured data.
... <div itemscope> <img itemprop="image" src="google-logo.png" alt="google"> </div> when a string value can't be easily read and understood by a person (e.g., a long string of numbers and letters), it can be displayed using the value attribute of the data element, with the more easily-understood-by-a human-version given in the element's contents (which is not part of the structured data - see example below).
...the outer item in this example is a top-level microdata item.
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Microformats - HTML: Hypertext Markup Language
for example if they wanted to identify themselves they could use an h-card such as: html example <a class="h-card" href="http://alice.example.com">alice blogger</a> when a parser encounters this data, it will know that this page contains a "card" which describes a person or organization named alice blogger with a url of http://alice.example.com/.
... as in this example, some markup patterns require only a single microformat root class name, which parsers use to find a few generic properties such as name, url, photo.
...for example: h-card describes a person or organization h-entry describes episodic or date stamped online content like a blog post h-feed describes a stream or feed of posts you can find many more vocabularies on the microformats2 wiki.
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Redirections in HTTP - HTTP
<head> <meta http-equiv="refresh" content="0; url=https://example.com/"> </head> the content attribute should start with a number indicating how many seconds the browser should wait before redirecting to the given url.
... javascript redirections redirections in javascript are performed by setting a url string to the window.location property, loading the new page: window.location = "https://example.com/"; like html redirections, this can't work on all resources, and obviously, this will only work on clients that execute javascript.
... on the other hand, there are more possibilities: for example, you can trigger the redirect only if some conditions are met.
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Numbers and dates - JavaScript
there are caveats to using bigint, however; for example, you can't mix and match bigint and number values in the same operation, and you can't use the math object with bigint values.
...for example, the math object's pi property has the value of pi (3.141...), which you would use in an application as math.pi similarly, standard mathematical functions are methods of math.
...for example, if you want to use the trigonometric function sine, you would write math.sin(1.56) note that all trigonometric methods of math take arguments in radians.
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Groups and ranges - JavaScript
for example, /green|red/ matches "green" in "green apple" and "red" in "red apple".
... for example, [abcd] is the same as [a-d].
... for example, [abcd-] and [-abcd] match the "b" in "brisket", the "c" in "chop", and the "-" (hyphen) in "non-profit".
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String.prototype.substring() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... if indexstart is greater than indexend, then the effect of substring() is as if the two arguments were swapped; see example below.
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The "codecs" parameter in common media types - Web media technologies
for example, bt.2020/bt.2100 color, as used for hdr video, is 09.
...for example, 10-bit bt.2020 is 14.
...for example, the standard coefficients used for bt.709 are indicated using the value 01.
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Performance fundamentals - Web Performance
for example, when a user taps the screen, they expect the pixels to change in a certain way.
...for example, paper covered with printed text reflects photons to the user's eyes in some pattern.
...a television probably looks choppy and unrealistic to a hummingbird, for example.
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Progressive web app structure - Progressive web apps (PWAs)
the most popular approach is the "app shell" concept, which mixes ssr and csr in exactly the way described above, and in addition follows the "offline first" methodology which we will explain in detail in upcoming articles and use in our example application.
...for example, an offline mode with the help of service workers is just an extra trait that makes the website experience better, but it's still perfectly usable without it.
... the streams api allows developers to have direct access to data streaming from the server — if you want to perform an operation on the data (for example, adding a filter to a video), you no longer need to wait for all of it to be downloaded and converted to a blob (or whatever) — you can start right away.
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The building blocks of responsive design - Progressive web apps (PWAs)
let's look at an example.
...this is just a simple grid example, but you can apply this principle to more complex grid layouts as required.
...in the snapshot example, we ended up with slightly different code: x-card:nth-child(1) video, x-card:nth-child(2) img { width: 100%; … } this is because in our case, we do in fact want the video and image to stretch to always fill their containers no matter what — a subtle but important difference from max-width — and therefore always be the same size.
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Applying SVG effects to HTML content - SVG: Scalable Vector Graphics
<style>p { mask: url(#my-mask); }</style> in the above example, all paragraphs are masked by an svg <mask> with the id my-mask.
... example: masking for example, you can make a gradient mask for html content using svg and css code similar to the following, inside your html document: <svg height="0"> <mask id="mask-1"> <lineargradient id="gradient-1" y2="1"> <stop stop-color="white" offset="0"/> <stop stop-opacity="0" offset="1"/> </lineargradient> <circle cx="0.25" cy="0.25" r="0.25" id="circle" fill="white"/> <rect x="0.5" y="0.2" width="300" height="100" fill="url(#gradient-1)"/> </mask> </svg> .target { mask: url(#mask-1); } p { width: 300px; border: 1px solid #000; display: inline-block; } note that in the css, the mask is specified using a url to the id #mask-1, which is the id of the svg mask specified below it.
...</p> the above example would be rendered with the mask applied to it.
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page-mod - Archive of obsolete content
for example, the following add-on displays an alert whenever the user visits any page hosted at "mozilla.org": var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*.mozilla.org", contentscript: 'window.alert("page matches ruleset");' }); you can modify the document in your script: var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*.mozilla.org", contentscript: 'document.body.innerhtml = ' + ' "<h1>page matches ruleset</h1>";' }); you can supply...
... for example, the following add-on retrieves the html content of specific tags from documents that match the pattern.
... for example, if you maintain a list of workers attached to a page-mod: var workers = []; var pagemod = require("sdk/page-mod").pagemod({ include: ['*'], contentscriptwhen: 'ready', contentscriptfile: data.url('pagemod.js'), onattach: function(worker) { workers.push(worker); } }); you can remove workers when they are no longer valid by listening to detach: var workers = []; function detachw...
...And 6 more matches

ui/button/toggle - Archive of obsolete content
for example, in the screenshots above, firefox uses the small icon when the button is in the toolbar and the large icon when the button is in the menu panel.
...for example, you might want to give it a different appearance when the current page is being served over https.
...for example, suppose the browser has two windows (w1 and w2), and each window has two tabs.
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Creating custom Firefox extensions with the Mozilla build system - Archive of obsolete content
m:version>0.1</em:version> <em:targetapplication> <!-- firefox --> <description> <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <em:minversion>1.0+</em:minversion> <em:maxversion>1.0+</em:maxversion> </description> </em:targetapplication> <!-- front-end metadata --> <em:name>my first extension</em:name> <em:description>just an example.</em:description> <em:creator>allpeers.com</em:creator> <em:homepageurl>http://www.allpeers.com/blog/</em:homepageurl> </description> </rdf> there's a detailed description of the format of the install.rdf file.
... here's an example of the makefile you need to place into your src directory: depth = ../../..
... = @srcdir@ include $(depth)/config/autoconf.mk is_component = 1 module = myextension library_name = myextension use_static_libs = 1 xpi_name = myextension cppsrcs = \ myfirstcomponent.cpp \ mysecondcomponent.cpp \ myextension.cpp \ $(null) include $(topsrcdir)/config/rules.mk extra_dso_ldopts += \ $(moz_component_libs) \ $(nspr_libs) \ $(null) in this example, the first two files contain the implementation of the extension's two components.
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The Essentials of an Extension - Archive of obsolete content
one is the email-like format in the hello world example, which should be something like <project-name>@<yourdomain>.
...for example, if you create a firefox extension, it would normally take little effort to port it to seamonkey, which has very similar features and ui.
...toolbars, menu bars, progress bars, and window title bars are all examples of elements that are typically part of the chrome.
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Installing plugins to Gecko embedding browsers on Windows - Archive of obsolete content
for example, netscape 6.0 and 6.01 do not write any of these keys into the registry, and thus these keys are not available for plugin vendors to parse for these two browsers.
...these keys are written by the installer of mozilla browsers -- the netscape 6.2 installer, for example, writes these keys to the registry, and so does the mozilla installer (for versions after mozilla 0.9.1).
...example: netscape 6 6.1\ look at the extensions subkey, e.g.
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Drag and Drop JavaScript Wrapper - Archive of obsolete content
the following is an example of calling the nsdraganddrop object.
...if we wanted to handle the other cases also, we can call the other functions, as in the following example: <description value="click and drag this text." ondraggesture="nsdraganddrop.startdrag(event,textobserver)" ondragover="nsdraganddrop.dragover(event,textobserver)" ondragexit="nsdraganddrop.dragexit(event,textobserver)" ondragdrop="nsdraganddrop.drop(event,textobserver)" /> as mentioned earlier, there is nothing special that happens during a dr...
...in the above examples, this observer is stored in the buttonobserver and textobserver variables.
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Editor Embedding Guide - Archive of obsolete content
getcommandstate "state_all"(boolean), "state_begin"(boolean), "state_end"(boolean), "state_mixed"(boolean), "state_enabled" (boolean) docommand no parameters example normal bold cmd_italics toggles italics style on selection.
... getcommandstate "state_all"(boolean), "state_begin"(boolean), "state_end"(boolean), "state_mixed"(boolean), "state_enabled" (boolean) docommand no parameters example normal italics cmd_underline toggles underline on selection.
... getcommandstate "state_all"(boolean), "state_begin"(boolean), "state_end"(boolean), "state_mixed"(boolean), "state_enabled" (boolean) docommand no parameters example normal underline cmd_tt toggles teletype style (monospace font) on selection.
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Elements - Archive of obsolete content
an explicit encoding declarations may be present to override the default, for example <?xml version="1.0" encoding="iso-8859-1"?> uri in namespace declarations is an opaque string used to uniquely identify the namespace.
... for clarity's sake, here's what the embedded xml in the previous example looks like: <?xml version="1.0"?> <bindings id="xbltestbindings" xmlns="http://www.mozilla.org/xbl"> <binding id="xbltest"><content>pass</content></binding> </bindings> only css declarations provide an easy way to attach bindings to any set of elements.
...for example, use the value 'xul:button' to create an element that is displayed like a button.
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Using XPInstall to Install Plugins - Archive of obsolete content
unlike native code installers (for example, files called setup.exe), the programming language for install operations in xpi is javascript.
...examples would be flash 6r47 on windows, which consists of a dll (called npswf32.dll) and an xpt file for scriptability (called flashplayer.xpt).
...for example, realplayer on windows consists of a plugin dll, but also the realplayer application (exe) which the plugin dll is a subset of.
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Writing to Files - Archive of obsolete content
try { var file = io.getfile("desktop", "myinfo.txt"); var stream = io.newoutputstream(file, "text"); } catch (ex) { alert(ex); } this example retrieves a file object on the desktop called 'myinfo.txt' using nsiscriptableio.getfile().
...in this example, the operations are enclosed in a try-catch block in order to capture any errors that might occur during the process.
...the newoutputstream method takes two arguments in this example.
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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.
... bottomright the bottom-right corner of the popup will be aligned with the specified corner or edge of the anchor element for example, a position value of bottomleft topleft means that the popup will be positioned such that the bottom-left corner of the anchor is aligned with the upper-left corner of the popup.
... the following table shows the valid values, corresponding explicit (ie, 2 word) alignment values and an example of the alignment.
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Actions - Archive of obsolete content
let's look at a simple example first.
...//www.xulplanet.com/ds/sample.rdf" ref="http://www.xulplanet.com/rdf/a"> <template> <query> <content uri="?start"/> <triple subject="?start" predicate="http://www.xulplanet.com/rdf/relateditem" object="?relateditem"/> </query> <action> <button uri="?relateditem" label="?relateditem"/> </action> </template> </vbox> in this example, we omit the <xul:rule> element around the <xul:action> as it is optional when we want to generate content unconditionally.
...here is the [example], and an image of what it looks like: the template builder iterates through the three results, processing the body of the action for each one in turn.
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Building Trees - Archive of obsolete content
here is an example (using an rdf source): <tree id="photoslist" flex="1" datasources="template-guide-photos5.rdf" ref="http://www.xulplanet.com/rdf/myphotos" flags="dont-build-content"> <treecols> <treecol id="name" label="name" flex="1"/> <treecol id="date" label="date" flex="1"/> </treecols> <template> <treechildren> <treeitem uri="rdf:*"> <treerow> <treecell label=...
...in the example above, the first cell should display the title.
...compare the example with a tree builder and the same example using a content builder.
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XML Templates - Archive of obsolete content
the ref attribute isn't currently used for xml sources, as the root of the document is always the starting point for xml queries; you should just set the ref attribute to a dummy value, for example '*' which is typically used.
... an example: <listbox datasources="people.xml" ref="*" querytype="xml"> <template> ...
... for this and the following examples, we are going to use the following xml document containing a list of people: <people> <person name="napoleon bonaparte" gender="male"/> <person name="cleopatra" gender="female"/> <person name="julius caesar" gender="male"/> <person name="ferdinand magellan" gender="male"/> <person name="laura secord" gender="female"/> </people> xml query syntax the query syntax is fairly simple for ...
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Custom toolbar button - Archive of obsolete content
open the file in firefox (for example, by dragging it and dropping it in firefox, or by choosing file – open file...
... copy the name from here and paste it, to avoid typing errors: custom-toolbar-button@example.com perform the following steps in this new directory, creating two files and a directory there.
...paste it into the new file: <?xml version="1.0"?> <rdf xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#"> <description about="urn:mozilla:install-manifest" em:name="custom button" em:description="my custom toolbar button" em:creator="my name" em:id="custom-toolbar-button@example.com" em:version="1.0" em:homepageurl="http://developer.mozilla.org/en/docs/custom_toolbar_button" em:iconurl="chrome://custombutton/content/icon.png" > <em:targetapplication><!-- firefox --> <description em:id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}" em:minversion="1.4" em:maxversion="*" /> </em:targetapplication> <em:targetapplication><!--...
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Adding Labels and Images - Archive of obsolete content
an example is shown below: example 1 : source view <label value="this is some text"/> the value attribute can be used to specify the text that you wish to have displayed.
...if the text needs to wrap, you can place the text content inside opening and closing tags as in the following example: example 2 : <label>this is some longer text that will wrap onto several lines.</label> as with html, line breaks and extra whitespace are collapsed into a single space.
...example 3 : source view <label value="click here:" control="open-button"/> <button id="open-button" label="open"/> in the example above, clicking the label will cause the button to be focused.
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Adding Methods to XBL-defined Elements - Archive of obsolete content
for example, if the method had three parameters, there would be three parameter elements.
...for example, the following javascript function would be written as an xbl method like so: function getmaximum(num1,num2) { if (num1 <= num2) return num2; else return num1; } xbl: <method name="getmaximum"> <parameter name="num1"/> <parameter name="num2"/> <body> if (num1 &lt;= num2) return num2; else return num1; </body> </method> this function, getmaximum, returns the largest of the values, each passed as a parameter to the method.
...for example, the following code will probably fail: var element = document.createelement("my_element"); element.getmaximum() // this will fail by the way, it is safe to call methods from the constructor, other methods on the object and event handlers.
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Grids - Archive of obsolete content
this should be easier to understand with an example.
... example 1 : source view <grid flex="1"> <columns> <column flex="2"/> <column flex="1"/> </columns> <rows> <row> <button label="rabbit"/> <button label="elephant"/> </row> <row> <button label="koala"/> <button label="gorilla"/> </row> </rows> </grid> two rows and two columns have been added to a grid.
...for example: example 2 : source view <grid flex="1"> <columns> <column/> <column flex="1"/> </columns> <rows> <row> <label control="doctitle" value="document title:"/> <textbox id="doctitle" flex="1"/> </row> <row> <label control="docpath" value="path:"/> <hbox flex="1"> <textbox id="docpath" flex="1"/> <button label="browse..."/> </...
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Introduction to XBL - Archive of obsolete content
for example, you might want to change how the pieces of a scroll bar function.
...for example, a binding might be attached to a scroll bar.
...the following example shows the basic skeleton of an xbl file: <?xml version="1.0"?> <bindings xmlns="http://www.mozilla.org/xbl"> <binding id="binding1"> <!-- content, property, method and event descriptions go here --> </binding> <binding id="binding2"> <!-- content, property, method and event descriptions go here --> </binding> </bindings> the bindings element is the root element of an xbl file and contains one or more binding elements.
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Vulnerabilities - Archive of obsolete content
an example is an input validation error, such as user-provided input not being properly evaluated for malicious character strings and overly long values associated with known attacks.
... another example is a race condition error that allows the attacker to perform a specific action with elevated privileges.
...examples of settings are an operating system offering access to control lists that set the privileges that users have for files, and an application offering a setting to enable or disable the encryption of sensitive data stored by the application.
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Choosing Standards Compliance Over Proprietary Practices - Archive of obsolete content
for example, an organization may decide that c++, java, and javascript will be the primary coding languages.
...sure, there are other reasons -– accountability, checkpoints, and scheduling, for example.
...for example, in the accounting arena there is fasb (financial accounting standards board) and iasb (international accounting standards board).
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Handling different text directions - Learn web development
we create borders on the top, right, bottom, and left of a box, for example.
... in the example below we have a heading displayed using writing-mode: vertical-rl.
... if we look at an example this will become clearer.
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Test your skills: Selectors - Learn web development
try updating the live code below to recreate the finished example: for assessment or further work purposes, download the starting point for this task to work in your own editor or in an online editor.
... selectors two without changing the html, make the following changes to the look of the content in this example: give the element with an id of special a yellow background.
... try updating the live code below to recreate the finished example: for assessment or further work purposes, download the starting point for this task to work in your own editor or in an online editor.
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CSS selectors - Learn web development
in earlier articles you met some different selectors, and learned that there are selectors that target the document in different ways — for example by selecting an element such as h1, or a class such as .special.
...for example, if i have the same css for an h1 and also a class of .special, i could write this as two separate rules.
... h1, .special { color: blue; } in the live example below try combining the two selectors which have identical declarations.
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What is a URL? - Learn web development
deeper dive basics: anatomy of a url here are some examples of urls: https://developer.mozilla.org https://developer.mozilla.org/docs/learn/ https://developer.mozilla.org/search?q=url any of those urls can be typed into your browser's address bar to tell it to load the associated page (resource).
...let's see the most important parts using the following url: http://www.example.com:80/path/to/myfile.html?key1=value1&key2=value2#somewhereinthedocument http is the protocol.
... www.example.com is the domain name.
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How do you set up a local testing server? - Learn web development
remote files throughout most of the learning area, we tell you to just open your examples directly in a browser — this can be done by double clicking the html file, dragging and dropping it into the browser window, or choosing file > open...
...in contrast, if you view one of our examples hosted on github (or an example on some other remote server), the web address will start with http:// or https://, to show that the file has been received via http.
... the problem with testing local files some examples won't run if you open them as local files.
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Sending forms through JavaScript - Learn web development
but forms can also prepare an http request to send via javascript, for example via xmlhttprequest.
... let's look at an example: <button>click me!</button> and now the javascript: const btn = document.queryselector('button'); function senddata( data ) { console.log( 'sending data' ); const xhr = new xmlhttprequest(); let urlencodeddata = "", urlencodeddatapairs = [], name; // turn the data object into an array of url-encoded key/value pairs.
...something went wrong.' ); } ); // set up our request xhr.open( 'post', 'https://example.com/cors.php' ); // add the required http header for form data post requests xhr.setrequestheader( 'content-type', 'application/x-www-form-urlencoded' ); // finally, send our data.
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Styling web forms - Learn web development
we'll walk through an example at the end of this article to give you some more ideas on basic form control styling and placement.
...to position it somewhere else, for example inside the fieldset somewhere, or near the bottom left corner, you need to rely on positioning.
... take the following example: to position the legend in this manner, we used the following css (other declarations removed for brevity): fieldset { position: relative; } legend { position: absolute; bottom: 0; right: 0; } the <fieldset> needs to be positioned too, so that the <legend> is positioned relative to it (otherwise the <legend> would be positioned relative to the <body>.) the <legend> element is very important for accessibility — it will be spoken by assistive technologies as part of the label of each form element inside the fieldset — but using a technique like the one above is fine.
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HTML basics - Learn web development
for example, content could be structured within a set of paragraphs, a list of bulleted points, or using images and data tables.
... for example, take the following line of content: my cat is very grumpy if we wanted the line to stand by itself, we could specify that it is a paragraph by enclosing it in paragraph tags: <p>my cat is very grumpy</p> anatomy of an html element let's explore this paragraph element a bit further.
...in the example above, we opened the <p> element first, then the <strong> element; therefore, we have to close the <strong> element first, then the <p> element.
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Choosing the right approach - Learn web development
single delayed operation repeating operation multiple sequential operations multiple simultaneous operations no yes (recursive callbacks) yes (nested callbacks) no code example an example that loads a resource via the xmlhttprequest api (run it live, and see the source): function loadasset(url, type, callback) { let xhr = new xmlhttprequest(); xhr.open('get', url); xhr.responsetype = type; xhr.onload = function() { callback(xhr.response); }; xhr.send(); } function displayimage(blob) { let objecturl = url.createobjecturl(blob); let image = docum...
... 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.
...falls you can use recursive settimeout() calls to run a function repeatedly in a similar fashion 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.
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Handling text — strings in JavaScript - Learn web development
for example, both of these are okay: let sgldbl = 'would you eat a "fish supper"?'; let dblsgl = "i'm feeling blue."; sgldbl; dblsgl; however, you can't include the same quote mark inside the string if it's being used to contain them.
...let's try an example in our console.
... concatenation in context let's have a look at concatenation being used in action — here's an example from earlier in the course: <button>press me</button> const button = document.queryselector('button'); button.onclick = function() { let name = prompt('what is your name?'); alert('hello ' + name + ', nice to see you!'); } here we're using a window.prompt() function in line 4, which asks the user to answer a question via a popup dialog box then stores the text they enter inside a given ...
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Storing the information you need — Variables - Learn web development
let's look at a simple example: <button>press me</button> const button = document.queryselector('button'); button.onclick = function() { let name = prompt('what is your name?'); alert('hello ' + name + ', nice to see you!'); } in this example pressing the button runs a couple of lines of code.
... to understand why this is so useful, let's think about how we'd write this example without using a variable.
...for example: myname = 'chris'; myage = 37; try going back to the console now and typing in these lines.
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Mozilla accessibility architecture
for example, they all expose an accessible name, or text representation, of each object, and they all use an enumerated integer value from a finite list, to expose the role of an object.
... examples of accessible role constants are role_button, role_checkbox and role_list, although they can have slightly different names and values in each api.
...for example, tables support nsiaccessibletable, text supports nsiaccessibletext and edit boxes support nsieditabletext., although this code has been moved into the atk specific directories because it is not currently used in windows.
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Configuring Build Options
this is useful if you choose to have multiple mozconfig files for different applications or configurations (see below for a full example).
... note that in the export example below the filename was not mozconfig.
... regardless of the name of the actual file you use, we refer to this file as the mozconfig file in the examples below.
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Following the Android Toasts Tutorial from a JNI Perspective
for example, navigating away from an email before you send it triggers a "draft saved" toast to let you know that you can continue editing later.
...the java code example above can be done with privileged javascript from firefox for android with the following code: window.nativewindow.toast.show("hello, firefox!", "short"); converting java to jni.jsm the first step is to look at the java code and see all the different types, methods, constructors, and fields that are being used.
...for example, if the class is blah.foo.bar then the signature of this will be this in slash notation with an l and ; around it.
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Localization and Plurals
for example, "1 page" vs "2 pages".
...for example, english uses plural rule 1, and localizing plurals would require a string of "plural;plurals" where the first word is the singular form and the second is the general plural form.
... examples the following are some examples for various languages and a brief thought processes.
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An overview of NSS Internals
some cryptography uses the same secret key for both encrypting and decrypting, for example password based encryption (pbe).
...a certificate contains lots of other details; for example, it contains a signature by a third party that expresses trust in the ownership relationship for the certificate.
...examples for the database files are key3.db and cert8.db, where the numbers are file version numbers.
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PKCS11 FAQ
multipart functions, such as bulk encryption, hashing, and mac functions (for example, c_digest and c_sign) and those that require overlapped operation (c_unwrap, c_decrypt) are handled by creating new sessions.
...example: rsa private key, ca certificate, user's own certificate, user's name.
...nss never attempts to cache this information, because login state can change instantly without nss knowing about it (for example, when the user removes the card).
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Building an Account Manager Extension
we name the extension "devmo-account" and state that it is located in the chrome package "example@mozilla.org".
... components.utils.import("resource://gre/modules/xpcomutils.jsm"); //class constructor function devmoaccountmanagerextension() {}; // class definition devmoaccountmanagerextension.prototype = { name : "devmo-account", chromepackagename : "example@mozilla.org", showpanel: function(server) { //this panel is only shown for imap accounts...
...the unique component identifier (change it if you copied this example!)...
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Working with ArrayBuffers
the second code example provides a specific illustration of the operation.
... this feature is based on the following work: //github.com/realityripple/uxp/blob/master/js/src/ctypes/ctypes.cpp#3080 //github.com/realityripple/uxp/blob/master/js/src/vm/arraybufferobject.cpp#1301 example 1 - image data the following example illustrates how to transfer a byte array pointed by ctypes.uint8_t.ptr to imagedata of canvas.
... this example is based on the fact that the imagedata returned from canvasrenderingcontext2d.getimagedata is a uint8clampedarray view for an arraybuffer.
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Accessibility Inspector - Firefox Developer Tools
the name depends on the element; for example, the name of most text elements is simply their textcontent, whereas form elements' names are the contents of their associated <label>.
... actions — a list of actions that can be performed on the item, for example, a pushbutton would have "press" listed, while a link would have "jump" listed.
...this can mean different things depending on the type of the item; for example, a form input (role: entry) would have a value of whatever is entered in the input, whereas a link's value would be the url in the corresponding <a> element's href.
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AddressErrors - Web APIs
see the examples below to see how this works.
...try to avoid asking the user to make corrections to things they can't change, and there may be situations in which you need to allow validation errors to be accepted anyway (for example, if you validate addresses against a postal service database and a new home has been built and its address is not yet in the database).
... examples snippet: limiting destination countries this first example is just a snippet showing an implementation of the event handler for the shippingaddresschange event which checks to be sure the chosen address is located within one of a limited number of countries.
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Basic usage of canvas - Web APIs
at the end of this page, you will know how to set up a canvas 2d context and have drawn a first example in your browser.
... for example, we could provide a text description of the canvas content or provide a static image of the dynamically rendered content.
... this can look something like this: <canvas id="stockgraph" width="150" height="150"> current stock price: $3.15 + 0.15 </canvas> <canvas id="clock" width="150" height="150"> <img src="images/clock.png" width="150" height="150" alt=""/> </canvas> telling the user to use a different browser that supports canvas does not help users who can't read the canvas at all, for example.
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Traversing an HTML table with JavaScript and DOM Interfaces - Web APIs
example: creating an html table dynamically (sample1.html) html <input type="button" value="generate a table." onclick="generate_table()"> javascript function generate_table() { // get the reference for the body var body = document.getelementsbytagname("body")[0]; // creates a <table> element and a <tbody> element var tbl = document.createelement("table"); var tblbody = document.createele...
... example: setting the background color of a paragraph getelementsbytagname(tagnamevalue) is a method available in any dom element or the root document element.
...dy elements (there will only be one), // and then select the zeroth (or first) such element mybody = document.getelementsbytagname("body")[0]; // now, get all the p elements that are descendants of the body mybodyelements = mybody.getelementsbytagname("p"); // get the second item of the list of p elements myp = mybodyelements[1]; myp.style.background = "rgb(255,0,0)"; } in this example, we set the myp variable to the dom object for the second p element inside the body: first, we get a list of all the body elements via mybody = document.getelementsbytagname("body")[0] since there is only one body element in any valid html document, this list will have only one item, which we retrieve by selecting the first element in that list using [0].
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HTMLImageElement.alt - Web APIs
it will be read aloud or sent to the touch device, for example, to support visually impaired users.
... examples beyond that, there are additional guidelines for using alt appropriately which vary depending on what the image is being used for.
... these are shown in the examples below.
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HTML Drag and Drop API - Web APIs
the setdata() method is used to add an item to the drag data, as shown in the following example.
...however, an application may define a custom image with the setdragimage() method, as shown in the following example.
... // note: change "example.gif" to a real image url or the image // will not be created and the default drag image will be used.
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Intersection Observer API - Web APIs
for example, if you want to be informed every time a target's visibility passes backward or forward through each 25% mark, you would specify the array [0, 0.25, 0.5, 0.75, 1] as the list of thresholds when creating the observer.
... threshold example <template id="boxtemplate"> <div class="samplebox"> <div class="label topleft"></div> <div class="label topright"></div> <div class="label bottomleft"></div> <div class="label bottomright"></div> </div> </template> <main> <div class="contents"> <div class="wrapper"> </div> </div> </main> .contents { position: absolute; width: 700px; height: 1725px; } .wra...
... a simple example this simple example causes a target element to change its color and transparency as it becomes more or less visible.
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Microdata DOM API - Web APIs
microdata becomes even more useful when scripts can use it to expose information to the user, for example offering it in a form that can be used by other applications.
... code example this sample shows how the getitems() method can be used to obtain a list of all the top-level microdata items of a particular type given in the document: var cats = document.getitems("http://example.com/feline"); once an element representing an item has been obtained, its properties can be extracted using the properties idl attribute.
... code example this sample gets the first item of type "http://example.net/user" and then pops up an alert using the "name" property from that item.
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Using the Notifications API - Web APIs
typically, system notifications refer to the operating system's standard notification mechanism: think for example of how a typical desktop system or mobile device broadcasts notifications.
... examples one of the most obvious use cases for web notifications is a web-based mail or irc application that needs to notify the user when a new message is received, even if the user is doing something else with another application.
... many examples of this now exist, such as slack.
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Using Service Workers - Web APIs
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.
... in the second example, myfunction() returns a promise for value, then the rest of the code can carry on running.
... 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?
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Basic Concepts of Multicol - CSS: Cascading Style Sheets
this guide explains how the specification works with some common use case examples.
...this happens in the same way that content is fragmented into pages when we work with css paged media, for example by creating a print stylesheet.
... in the below example we use the column-count property to create three columns on the .container element.
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Using feature queries - CSS: Cascading Style Sheets
you may not test for a bare property name such as display; the rule requires a property name and a value: @supports (property: value) { css rules to apply } if you want to check if a browser supports the row-gap property, for example, you would write the following feature query.
...a good example would be the display property.
... testing for lack of support in addition to asking the browser if it supports a feature, you can test for the opposite by adding in the not keyword: @supports not (property: value) { css rules to apply } the css inside the following example feature query will run if the browser does not support row-gap.
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Relationship of flexbox to other layout methods - CSS: Cascading Style Sheets
you can change the live example below to these modes in order to see what happens to the flex layout.
...for example, if an item is floated and then its parent becomes a flex container.
... in this next live example the child elements have been floated, and then their container has had display: flex added.
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OpenType font features guide - CSS: Cascading Style Sheets
some fonts will have one or more of these features enabled by default (kerning and default ligatures are common examples), while others are left to the designer or developer to choose to enable in specific scenarios.
... note: the examples below show the properties and some example combinations, along with the lower-level syntax equivalents.
... they may not match exactly due to browser implementation inconsistencies, but in many cases the first example will match the second.
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Layout using named grid lines - CSS: Cascading Style Sheets
once you work through some examples it should become clearer and easier to work with.
... giving lines multiple names you may want to give a line more than one name, perhaps it denotes the sidebar-end and the main-start for example.
... while you can choose any name, if you append -start and -end to the lines around an area, as i have in the example above, grid will create you a named area of the main name used.
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Line-based placement with CSS Grid - CSS: Cascading Style Sheets
a basic example as a very simple example we can take a grid with 3 column tracks and 3 row tracks.
... class="wrapper"> <div class="box1">one</div> <div class="box2">two</div> <div class="box3">three</div> <div class="box4">four</div> </div> .box1 { grid-column: 1 / 2; grid-row: 1 / 4; } .box2 { grid-column: 3 / 4; grid-row: 1 / 3; } .box3 { grid-column: 2 / 3; grid-row: 1 / 2; } .box4 { grid-column: 2 / 4; grid-row: 3 / 4; } default spans in the above examples i specified every end row and column line, in order to demonstrate the properties, however in practice if an item only spans one track you can omit the grid-column-end or grid-row-end value.
...this means that our initial, long-hand, example would look like this: * {box-sizing: border-box;} .wrapper { border: 2px solid #f76707; border-radius: 5px; background-color: #fff4e6; display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 100px); } .wrapper > div { border: 2px solid #ffa94d; border-radius: 5px; background-color: #ffd8a8; padding: 1em; color: #d9480f; } <div class="wrapper"> <div class="box1">one</div> <div class="box2">two</div> <div class="box3">three</div> <div class="box4">four</div> </div> .box1 { grid-column-start: 1; grid-row-start: 1; grid-row-end: 4; } .box2 { grid-column-start: 3; grid-row-start: 1; grid-row-end: 3; } .box3...
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Overview of CSS Shapes - CSS: Cascading Style Sheets
you could for example float an item left, which would cause the text to wrap round the right and bottom of the item in a rectangular fashion.
... in the following example i have an image floated left.
... basic shapes the value circle(50%) is an example of a basic shape.
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CSS values and units - CSS: Cascading Style Sheets
for example, the value of grid-area can be a <custom-ident>, so if we had a grid area named content we would use it without quotes: .item { grid-area: content; } in comparison, a data type that is a <string>, such as a string value of the content property, must be quoted: .item::after { content: "this is my content."; } while you can generally create any name you want, including using emojis, the...
...for example, if you wanted to include a background image, you might use either of the following.
... numbers a <number> represents a real number, which may or may not have a decimal point with a fractional component, for example 0.255, 128 or -1.2.
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<angle> - CSS: Cascading Style Sheets
it is used, for example, in <gradient>s and in some transform functions.
... the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
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box-decoration-break - CSS: Cascading Style Sheets
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... formal definition initial valuesliceapplies toall elementsinheritednocomputed valueas specifiedanimation typediscrete formal syntax slice | clone examples inline box fragments an inline element that contains line breaks styled with: .example { background: linear-gradient(to bottom right, yellow, green); box-shadow: 8px 8px 10px 0px deeppink, -5px -5px 5px 0px blue, 5px 5px 15px 0px yellow; padding: 0em 1em; border-radius: 16px; border-style: solid; margin-left: 10px; font: 24px sans-serif; line-height: 2; } ...
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Date and time formats used in HTML - HTML: Hypertext Markup Language
for <input>, the values of type that return a value which contains a string representing a date and/or time are: date datetime datetime-local month time week examples before getting into the intricacies of how date and time strings are written and parsed in html, here are some examples that should give you a good idea what the more commonly-used date and time string formats look like.
... example html date and time strings string date and/or time 2005-06-07 june 7, 2005 [details] 08:45 8:45 am [details] 08:45:25 8:45 am and 25 seconds [details] 0033-08-04t03:40 3:40 am on august 4, 33 [details] 1977-04-01t14:00:30 30 seconds after 2:00 pm on april 1, 1977 [details] 1901-01-01t00:00z midnight utc on january 1, 1901 [details] 1901-01-01t00:00:01-04:00 1 second past midnight eastern standard time (est) on january 1, 1901 [details] basics before looking at the various formats of date and time related strings used by html elements, it is helpful to understand a few fundamental facts about the way they're defined.
...for example, the first thursday of 1953 was on january 1, so that week—beginning on monday, december 29—is considered the first week of the year.
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<bdi>: The Bidirectional Isolate element - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...in this algorithm, characters are given an implicit directionality: for example, latin characters are treated as ltr while arabic characters are treated as rtl.
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<input type="button"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... in this example, s is specified as the access key (you'll need to press s plus the particular modifier keys for your browser/os combination; see accesskey for a useful list of those).
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<input type="password"> - HTML: Hypertext Markup Language
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... specifics of how the entry process works may vary from browser to browser; mobile devices, for example, often display the typed character for a moment before obscuring it, to allow the user to be sure they pressed the key they meant to press; this is helpful given the small size of keys and the ease with which the wrong one can be pressed, especially on virtual keyboards.
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CSP: base-uri - HTTP
examples: http://*.example.com: matches all attempts to load from any subdomain of example.com using the http: url scheme.
... mail.example.com:443: matches all attempts to access port 443 on mail.example.com.
... https://store.example.com: matches all attempts to access store.example.com using https:.
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CSP: default-src - HTTP
examples: http://*.example.com: matches all attempts to load from any subdomain of example.com using the http: url scheme.
... mail.example.com:443: matches all attempts to access port 443 on mail.example.com.
... https://store.example.com: matches all attempts to access store.example.com using https:.
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CSP: script-src-attr - HTTP
examples: http://*.example.com: matches all attempts to load from any subdomain of example.com using the http: url scheme.
... mail.example.com:443: matches all attempts to access port 443 on mail.example.com.
... https://store.example.com: matches all attempts to access store.example.com using https:.
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CSP: script-src-elem - HTTP
examples: http://*.example.com: matches all attempts to load from any subdomain of example.com using the http: url scheme.
... mail.example.com:443: matches all attempts to access port 443 on mail.example.com.
... https://store.example.com: matches all attempts to access store.example.com using https:.
...And 6 more matches

CSP: script-src - HTTP
examples: http://*.example.com: matches all attempts to load from any subdomain of example.com using the http: url scheme.
... mail.example.com:443: matches all attempts to access port 443 on mail.example.com.
... https://store.example.com: matches all attempts to access store.example.com using https:.
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An overview of HTTP - HTTP
most of the time the user-agent is a web browser, but it can be anything, for example a robot that crawls the web to populate and maintain a search engine index.
...between the client and the server there are numerous entities, collectively called proxies, which perform different operations and act as gateways or caches, for example.
...this immediately has the prospect of being problematic for users attempting to interact with certain pages coherently, for example, using e-commerce shopping baskets.
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Array.prototype.forEach() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...(for sparse arrays, see example below.) callback is invoked with three arguments: the value of the element the index of the element the array object being traversed if a thisarg parameter is provided to foreach(), it will be used as callback's this value.
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String.prototype.normalize() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...for example, the code point for "a" is given as u+0041.
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String.prototype.replace() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
...above.) for example, if /(\a+)(\b+)/, was given, p1 is the match for \a+, and p2 for \b+.
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String.prototype.split() - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... for example, a string containing tab separated values (tsv) could be parsed by passing a tab character as the separator, like this: mystring.split("\t").
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Operator precedence - JavaScript
the source for this interactive example is stored in a github repository.
... if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
... as another example, the unique exponentiation operator has right-associativity, whereas other arithmetic operators have left-associativity.
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Populating the page: how browsers work - Web Performance
if you navigate to https://example.com, the html page is located on the server with ip address of 93.184.216.34.
... <!doctype html> <html> <head> <meta charset="utf-8"/> <title>my simple page</title> <link rel="stylesheet" src="styles.css"/> <script src="myscript.js"></script> </head> <body> <h1 class="heading">my page</h1> <p>a paragraph with a <a href="https://example.com/about">link</a></p> <div> <img src="myimage.jpg" alt="image description"/> </div> <script src="anotherscript.js"></script> </body> </html> this response for this initial request contains the first byte of data received.
... in our example above, the request is definitely less than 14kb, but the linked resources aren't requested until the browser encounters the links during parsing, described below.
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Media - Progressive web apps (PWAs)
for example, you are probably reading this on a device with a display.
... example a document on a website has a navigation area that contains the primary site menu.
...for example, in html, you have the option to specify the media type with a media attribute in the link element.
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