Other Resources - SVG: Scalable Vector Graphics
here is a list of additional resources on svg: mozilla svg resources svg.org svgbasics tutorials w3c svg homepage svg wiki http://wiki.svg.org/index.php?title=..._configuration i moved this from the other resources category, not sure why it's in other resources -nickolay http://developer.mozilla.org/en/docs...%28external%29 ...

Index - Web APIs
it's basically an average between the current buffer and the last buffer the analysernode processed, and results in a much smoother set of value changes over time.
...anywhere you see animationtimeline, you should use documenttimeline or any other timeline type instead.
... 167 audioparam.cancelandholdattime() api, audio, audioparam, experimental, method, reference, web audio api, cancelandholdattime, cancelvaluesandholdattime the cancelandholdattime() property of the audioparam interface cancels all scheduled future changes to the audioparam but holds its value at a given time until further changes are made using other methods.
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Index - Archive of obsolete content
2 .htaccess ( hypertext access ) 301 redirect, cache control, custom error pages, htaccess, permanent redirect, redirect file accessing : htaccess files can be opened using any text editor, like windows notepad, vin, sublime text editor or any other.
... 14 communicating with other scripts no summary!
... 15 communicating using "port" to enable add-on scripts and content scripts to communicate with each other, each end of the conversation has access to a port object.
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Index - MDN Web Docs Glossary: Definitions of Web-related terms
the api can be seen as a simple contract (the interface) between the application offering it and other items, such as third party software or hardware.
... 6 aria accessibility, glossary aria (accessible rich internet applications) is a w3c specification for adding semantics and other metadata to html to cater to users of assistive technology.
...in other programming languages different numeric types can exist, for examples: integers, floats, doubles, or bignums.
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Index
it is separated in 2 parts, one section related to debugging and another section related to drafting optimizations.
...otherwise, int_fits_in_jsval returns false.
...in other words, it returns the global object on the current scope chain.
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Index
applications built with nss can support ssl v3, tls, pkcs #5, pkcs #7, pkcs #11, pkcs #12, s/mime, x.509 v3 certificates, and other security standards.
...it's free and open source software, and many other software projects have decided to use it.
...(note that it's important to look at the number 11, as there are other pkcs standards with different numbers that define quite different topics.) a software or hardware module conforming to the pkcs#11 standard implements an interface of c calls, which allow querying the characteristics and offered services of the module.
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WebIDL bindings
adding webidl bindings to a class to add a webidl binding for interface myinterface to a class mozilla::dom::myinterface that's supposed to implement that interface, you need to do the following: if your interface doesn't inherit from any other interfaces, inherit from nswrappercache and hook up the class to the cycle collector so it will trace the wrapper cache properly.
... note that you may not need to do this if your objects can only be created, never gotten from other objects.
...if your interface does inherit from another interface, just inherit from the c++ type that the other interface corresponds to.
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Index - Learn web development
you can do that with other people's code too!
...you won't build another facebook right away, but it's not hard to get your own simple website online, so we'll start there.
...you should understand these concepts before working through the other articles in the module.
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Index
2 accessing the windows registry using xpcom add-ons, code snippets, extensions, needsclassification, windows registry when implementing windows-specific functionality, it is often useful to access the windows registry for information about the environment or other installed programs.
... 15 language bindings embedding, landing, mozilla, xpcom, xpcom:language bindings an xpcom language binding is a bridge between a particular language and xpcom to provide access to xpcom objects from that language, and to let modules written in that language be used as xpcom objects by all other languages for which there are xpcom bindings.
... 53 other resources javaxpcom, xpcom:language bindings no summary!
...And 36 more matches

Introduction to Public-Key Cryptography - Archive of obsolete content
encryption and decryption allow two communicating parties to disguise information they send to each other.
...ion managing certificates certificates and authentication a certificate identifies someone or something authentication confirms an identity how certificates are used contents of a certificate how ca certificates are used to establish trust a certificate identifies someone or something a certificate is an electronic document used to identify an individual, a server, a company, or some other entity and to associate that identity with a public key.
... like a driver's license, a passport, or other commonly used personal ids, a certificate provides generally recognized proof of a person's identity.
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sslfnc.html
nss_init nss_initreadwrite nss_nodb_init ssl_optionsetdefault ssl_optiongetdefault ssl_cipherprefsetdefault ssl_cipherprefgetdefault ssl_clearsessioncache ssl_configserversessionidcache ssl_configmpserversidcache ssl_inheritmpserversidcache nss_init sets up configuration files and performs other tasks required to run network security services.
...this may be helpful if you have an export license that permits more or fewer capabilities than those allowed by the other export policy functions.
... nss_initreadwrite sets up configuration files and performs other tasks required to run network security services.
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Codecs used by WebRTC - Web media technologies
the webrtc api makes it possible to construct web sites and apps that let users communicate in real time, using audio and/or video as well as optional data and other information.
...this guide reviews the codecs that browsers are required to implement as well as other codecs that some or all browsers support for webrtc.
... containerless media webrtc uses bare mediastreamtrack objects for each track being shared from one peer to another, without a container or even a mediastream associated with the tracks.
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Index - Archive of obsolete content
the same process occurs when decreasing the size, except in the other direction.
... 422 deprecated and defunct markup reference, xul {many elements on this page are wrongly marked as deprecated, this page needs review} 423 dynamically modifying xul-based user interface add-ons, dom, extensions, xul this article discusses manipulating xul interfaces, using dom and other apis.
...an output stream is an object which can be used to write bytes, strings and other values to a file.
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Signaling and video calling - Web APIs
a form of discovery and media format negotiation must take place, as discussed elsewhere, in order for two devices on different networks to locate one another.
...through this third server, the two devices can locate one another, and exchange negotiation messages.
...what does matter is when the ice subsystem instructs you to send signaling data to the other peer, you do so, and the other peer knows how to receive this information and deliver it to its own ice subsystem.
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Rendering and the WebXR frame animation callback - Web APIs
before you can render the virtual environment, you need to establish a webxr session by creating an xrsession using the navigator.xr.requestsession() method; you also need to associate the session with a framebuffer and perform other setup tasks.
...instead, the frame rendering code—in this case, a function named mydrawframe()—is responsible for scheduling time to draw another frame by once again calling requestanimationframe().
... hardare vertical refresh rate when the browser is ready to refresh the <canvas> within which your webxr content is displayed, it calls your frame rendering callback, which uses the specified timestamp and any other relevant data, such as models and textures, as well as application state, to render the scene—as it should appear at the specified time—into the webgl backbuffer.
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MMgc - Archive of obsolete content
it is a static library that is linked into the flash player but kept separate, and can be incorporated into other programs.
...another way to think about it: unmanaged memory is c++ operators new and delete managed memory is c++ operator new, with optional delete mmgc contains a page allocator called gcheap, which allocates large blocks (megabytes) of memory from the system and doles out 4kb pages to the unmanaged memory allocator (fixedmalloc) and the managed memory allocator (gc).
... each instance manages its own set of objects; objects are not allowed to reference objects in other gc instances.
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CustomizableUI.jsm
if you want to use it from a jsm or another context without a window reference, you need to import it yourself: components.utils.import("resource:///modules/customizableui.jsm"); introduction the module is intended for two primary purposes: allow adding, moving and removing customizable widgets.
...this can be useful if other parts of the code need to react to changes in the customization of the user interface.
...note that customizableui won't restore state in the area, allow the user to customize it in customize mode, or otherwise deal with it, until the area has been registered.
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XUL Structure - Archive of obsolete content
how xul is handled in mozilla, xul is handled in much the same way as html or other types of content are handled.
...style sheets (css), images, and other technologies are used to control the presentation.
...however, there are some features that are specific to html, such as forms, and others which are specific to xul, such as overlays.
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Drawing graphics - Learn web development
while you could use css and javascript to animate (and otherwise manipulate) svg vector images — as they are represented by markup — there was still no way to do the same for bitmap images, and the tools available were rather limited.
... the web still had no way to effectively create animations, games, 3d scenes, and other requirements commonly handled by lower level languages such as c++ or java.
... the situation started to improve when browsers began to support the <canvas> element and associated canvas api — apple invented it in around 2004, and other browsers followed by implementing it in the years that followed.
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Bytecode Descriptions
otherwise push false.
...pop two values, convert them to numeric values, subtract the top value from the other one, and push the result.
...format: jof_ic other expressions globalthis stack: ⇒ this push the global this value.
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Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
xul, on the other hand, was conceived from the ground up as a markup language for user interfaces, and makes it possible to insert ui components with sophisticated features just by writing tags, without any particular scripting.
... xul display methods xul is used almost exclusively in mozilla applications like firefox and thunderbird, and extensions for them, but other web browsers based on firefox or the gecko engine, and even web-based content also used xul.
... fixme: explain how setting this option and use next listings if we want to run firefox displaying none of its gui and only the contents of a certain xul file, we can launch firefox and set the option: -chrome file_url.xul another way, as shown in listing 1, is to use the window.opendialog() method, which can be used only within a xul window.
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Cross-Origin Resource Sharing (CORS) - HTTP
this means that a web application using those apis can only request resources from the same origin the application was loaded from unless the response from other origins includes the right cors headers.
...another article for server developers discussing cross-origin sharing from a server perspective (with php code snippets) is supplementary reading.
...additionally, for http request methods that can cause side-effects on server data (in particular, http methods other than get, or post with certain mime types), the specification mandates that browsers "preflight" the request, soliciting supported methods from the server with the http options request method, and then, upon "approval" from the server, sending the actual request.
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Mozilla
accessibility and mozilla accessibility is the idea that software (among other things) should be designed to be usable and, as much as possible, convenient to use for people with disabilities.
... bugzilla bugzilla.mozilla.org (often abbreviated b.m.o) is mozilla.org's bug-tracking system, a database for recording bugs and enhancement requests for firefox, thunderbird, seamonkey, camino, and other mozilla.org projects.
... building mozilla in this article, we list documents that will guide you in building firefox or other projects based upon mozilla code.
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The Essentials of an Extension - Archive of obsolete content
firefox needs this to distinguish your extension from other extensions, so it is required that you have an id that is unique.
...the other standard practice is to use a generated uuid string, which is extremely unlikely to be duplicated.
...there are many other tags that can be added, for contributors and translators.
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Browser Detection and Cross Browser Support - Archive of obsolete content
note that some other browsers such as safari are reporting (like gecko) in their user agent strings and can confuse simple tests.
...unlike other browsers, gecko is truly cross platform and provides consistent behavior across all supported operating systems.
...unfortunately, no other browser supports web standards as completely as gecko.
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LiveConnect Overview - Archive of obsolete content
this chapter describes using liveconnect technology to let java and javascript code communicate with each other.
... note: because java is a strongly typed language and javascript is weakly typed, the javascript runtime engine converts argument values into the appropriate data types for the other language when you use liveconnect.
...(although this functionality (along with some others) had been broken in gecko 1.9 (see bug 391642) as the mozilla-specific liveconnect code had not been maintained inside mozilla, with java 6 update 11 and 12 building support for reliance on mozilla's implementation of the generic (and cross-browser) npapi plugin code, this has again been fixed.) for example, suppose you are using the java forname method to assign the name of a java class to a va...
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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.
... people with hearing impairments relying on captions/subtitles or other text alternatives for audio/video content.
...we've already talked about other spheres such as responsive design and performance in other places in the module.
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JSAPI User Guide
note: the foss wiki page contains a few links to other libraries and programs that can make life easier when using spidermonkey and jsapi.
...but in mozilla, all of these features are actually provided by other components, not the spidermonkey engine itself.
...they cannot travel to other runtimes or be shared across runtimes.
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Web video codec guide - Web media technologies
in some situations, a greater sacrifice of quality in order to bring down the data size is worth that lost quality; other times, the loss of quality is unacceptable and it's necessary to accept a codec configuration that results in a correspondingly larger file.
...if the codec converts the media into an internal pixel format, or otherwise represents the image using a means other than simple pixels, the format of the original image doesn't make any difference.
...to a point, the higher the frame rate, the smoother and more realistic the motion will appear.
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Handling common HTML and CSS problems - Learn web development
in other cases, nascent features are not supported consistently across browsers, which can make some features and styles not work for some users.
... note: one common problem with css and html arises when different css rules begin to conflict with one another.
... linters another good option to choose is a so-called linter application, which not only points out errors, but can also flag up warnings about bad practices in your css, and other points besides.
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HTML documentation index - HTML: Hypertext Markup Language
other technologies besides html are generally used to describe a web page's appearance/presentation (css) or functionality/behavior (javascript).
...the attribute value must consist of a single printable character (which includes accented and other characters that can be generated by the keyboard).
...this value must be less than or equal to the value of maxlength, otherwise the value will never be valid, as it is impossible to meet both criteria.
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Handling common JavaScript problems - Learn web development
these days, most cross-browser javascript problems are seen: when poor-quality browser-sniffing code, feature-detection code, and vendor prefix usage block browsers from running code they could otherwise use just fine.
...install this first (using the install button), as other linters rely on it to work.
... after the packages have finished installing, try loading up a javascript file: you'll see any issues highlighted with green (for warnings) and red (for errors) circles next to the line numbers, and a separate panel at the bottom provides line numbers, error messages, and sometimes suggested values or other fixes.
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Starting WebLock
using them is a good way for objects to pass messages to each other without the objects having explicit knowledge of one another.
...if your object would like to register for this or other events, it first must implement the nsiobserver interface.
...in other words, the observe method should never be called in response to some event for which the object is not registered.
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Using IndexedDB - Web APIs
opening a database is just like any other operation — you have to "request" it.
...most other asynchronous functions in indexeddb do the same thing - return an idbrequest object with the result or error.
...it also means that you can't use a float, otherwise it will be converted to the closest lower integer and the transaction may not start, nor the upgradeneeded event trigger.
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Web Accessibility: Understanding Colors and Luminance - Accessibility
understaning color, luminance, and saturation is important in meeting wcag 2 accessibility guidelines in terms of ensuring enough color contrast for sighted users with color blindness or reduced vision and preventing seizures and other physical reactions in people with vestibular disorders.
... in terms of accessibility, the use of certain color-combinations have more impact than others.
... how the viewer perceives color after it gets to his eyes is yet another matter, and can be affected by overall health.
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Creating custom Firefox extensions with the Mozilla build system - Archive of obsolete content
on the other hand, if you are an experienced developer or team, and you know that you are going to build a large, complex extension, you would do well to consider the approach described in this article.
... one final note: i've only tried these techniques inside firefox, but they'll probably work more or less unchanged on other gecko-based platforms like thunderbird or seamonkey.
...if you're not an experienced c++ developer, i wouldn't even bother.
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Mozilla Crypto FAQ - Archive of obsolete content
in february 2000 iplanet e-commerce solutions (a sun-netscape alliance) released source code through mozilla.org for the personal security manager and network security services software; this source code included support for the ssl protocol, but due to the rsa patent and related legal issues it did not originally contain code for rsa or other cryptographic algorithms.
...shortly thereafter the nss developers began work on an open source implementation of the rsa algorithm; that code, together with code previously developed for other cryptographic algorithms, will be included in a new version 3.1 of the nss open source cryptographic and pki library.
... (you may also be interested in a more in-depth analysis of the new regulations, with an emphasis on how they affect open source software.) for more information on the ssl, s/mime, pki, and other crypto source code being developed as part of the mozilla project, see the pki project page and of course the source code itself.
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XUL accessibility guidelines - Archive of obsolete content
when creating an extension (for firefox or another xul application), make sure the keyboard shortcuts you assign do not interfere with those already defined by the base application.
...consider using context menu items or other xul elements along with keyboard shortcuts.
...other elements, such as arrowscrollbox and listbox, are made to scroll automatically.
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Introduction to SSL - Archive of obsolete content
most other red hat products plan to support the protocol in future versions.
...other protocols, such as the hypertext transport protocol (http), lightweight directory access protocol (ldap), or internet messaging access protocol (imap), run "on top of" tcp/ip in the sense that they all use tcp/ip to support typical application tasks such as displaying web pages or running email servers.
... these capabilities address fundamental concerns about communication over the internet and other tcp/ip networks: ssl server authentication allows a user to confirm a server's identity.
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An Overview of XPCOM
the goal of xpcom is to allow different pieces of software to be developed and built independently of one another.
...the most important use of xpcom is within gecko, an open source, standards compliant, embeddable web browser and toolkit for creating web browsers and other applications.
... modular, component-based programming makes software easier to develop and maintain and has some well-known advantages: benefit description reuse modular code can be reused in other applications and other contexts.
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Mozilla release FAQ - Archive of obsolete content
various other people have contributed to this faq.
...the project is maintained by employees of netscape (now a division of aol), red hat, some other companies, as well as contributors from the community.
...if built from cvs, the date of the cvs checkout is the best way to refer to the version, otherwise use the release number.
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Manipulating documents - Learn web development
in this article we'll look at how to use the dom in detail, along with some other interesting apis that can alter your environment in interesting ways.
... objective: to gain familiarity with the core dom apis, and the other apis commonly associated with dom and document manipulation the important parts of a web browser web browsers are very complicated pieces of software with a lot of moving parts, many of which can't be controlled or manipulated by a web developer using javascript.
...imagine if a web site could get access to your stored passwords or other sensitive information, and log into websites as if it were you?
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Inputs and input sources - Web APIs
by combining these two types of input with the changing of viewing position and/or orientation through the headset or other mechanisms, you can create an interactive simulated environment.
... motion-sensing controllers, which use accelerometers, magnetometers, and other sensors for motion tracking and targeting and may additionally include any number of buttons, joysticks, thumbpads, touchpads, force sensors, and so on to provide additional input sources for both targeting and selection.
... spatially-tracked articulated hands, such as haptic gloves can provide both targeting and squeeze actions, as well as selection if outfitted with buttons or other sources of selection actions.
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Introduction to client-side frameworks - Learn web development
developers who worked with javascript wrote tools to solve the problems they faced, and packaged them into reusable packages called libraries, so they could share their solutions with others.
...users write papers, manage their budgets, stream music, watch movies, and communicate with others over great distances instantaneously, with text, audio or video chat.
...react is used in combination with other libraries to make applications — react and react native enable developers to make mobile applications; react and reactdom enable them to make web applications, etc.
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nsITextInputProcessor
createinstance(components.interfaces.nsitextinputprocessor); next, you need to get the rights to create composition or dispatch keyboard events with begininputtransaction() or begininputtransactionfortests(): if (!tip.begininputtransaction(window, callback)) { return; } if begininputtransaction() or begininputtransactionfortests() returns false, it means that another instance of nsitextinputprocessor has composition on the window or is dispatching an event.
... in this case, other instances cannot create composition nor dispatch keyboard events on the window.
... }); // the other attributes are always ignored.
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Web audio codec guide - Web media technologies
for more information about these and other features of audio data, see audio data format and structure in digital audio concepts.
...some of these are a matter of the form of the source audio; others are related to decisions made while encoding the audio.
... lossy codecs, on the other hand, take advantage of the fact that the human ear is not a perfect interpreter of audio, and of the fact that the human brain can pluck the important information out of imperfect or noisy audio.
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Performance fundamentals - Web Performance
all other things being equal, code optimized for some target besides user-perceived performance (hereafter upp) loses when competing against code optimized for upp.
...of course, it's by no means pointless to optimize other metrics, but real upp targets come first.
... memory usage memory usage is another key metric.
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SVG documentation index - SVG: Scalable Vector Graphics
8 other resources reference, svg here is a list of additional resources on svg: 9 project svg no summary!
...this allows representation of values that would otherwise be clamped to 0 or 1.
... 85 font-weight svg, svg attribute the font-weight attribute refers to the boldness or lightness of the glyphs used to render the text, relative to other fonts in the same font family.
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How to convert an overlay extension to restartless - Archive of obsolete content
there will be no usage of the add-on sdk or any other external libraries here.
...if not, see if you still can't do things any other way.
... if you need to read data, or otherwise access files within your bundle, there are two options.
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Web Replay
replaying processes preserve all the same js behavior, dom structures, graphical updates, and most other behaviors that occurred while recording.
... this requires using the same build of firefox and a reasonably similar version of the operating system; otherwise the tab will probably crash.
... intra-thread non-deterministic behaviors are non-deterministic even in the absence of actions by other threads, and inter-thread non-deterministic behaviors are those affected by interleaving execution with other threads, and which always behave the same given the same interleaving.
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Handling Mozilla Security Bugs
at the same time, mozilla.org is also creating a larger "mozilla security bug group" by which mozilla contributors and others can participate in addressing security vulnerabilities in mozilla.
...this work is separate from the work of developers adding new security features (cryptographically-based or otherwise) to mozilla, although obviously many of the same people will be involved in both sets of activities.
... background security vulnerabilities are different from other bugs, because their consequences are potentially so severe: users' private information (including financial information) could be exposed, users' data could be destroyed, and users' systems could be used as platforms for attacks on other systems.
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Window.open() - Web APIs
this can be a path or url to an html page, image file, or any other resource that is supported by the browser.
...otherwise the call to window.open() will just create a new window.
...google chrome (55.0.2883.87 m ) on the other hand will do it only from the same parent (as if the window was created dependent, which is the "opener").
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Implementing a Microsoft Active Accessibility (MSAA) Server - Accessibility
they need to know about focus changes and other events, and it needs to know what objects are contained in the current document or dialog box.
...this is so commonly done, that no one even bothers to support the msaa caret, after all the hack is general solution works with pretty much all applications.
... myth: "msaa sucks" reality: this statement may come from another engineer or even an employee of an at vendor.
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HTML elements reference - HTML: Hypertext Markup Language
all other elements must be descendants of this element.
...metadata for styles and scripts may be defined in the page or link to another file that has the information.
...this element is most commonly used to link to stylesheets, but is also used to establish site icons (both "favicon" style icons and icons for the home screen and apps on mobile devices) among other things.
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HTML: A good basis for accessibility - Learn web development
even better, semantic markup has other benefits beyond accessibility: easier to develop with — as mentioned above, you get some functionality for free, plus it is arguably easier to understand.
...an excellent semantic example might look something like the following: <h1>my heading</h1> <p>this is the first section of my document.</p> <p>i'll add another paragraph here too.</p> <ol> <li>here is</li> <li>a list for</li> <li>you to read</li> </ol> <h2>my subheading</h2> <p>this is the first subsection of my document.
...<br><br> i'll add another paragraph here too.
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HTML: A good basis for accessibility - Learn web development
even better, semantic markup has other benefits beyond accessibility: easier to develop with — as mentioned above, you get some functionality for free, plus it is arguably easier to understand.
...an excellent semantic example might look something like the following: <h1>my heading</h1> <p>this is the first section of my document.</p> <p>i'll add another paragraph here too.</p> <ol> <li>here is</li> <li>a list for</li> <li>you to read</li> </ol> <h2>my subheading</h2> <p>this is the first subsection of my document.
...<br><br> i'll add another paragraph here too.
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Mozilla Web Developer FAQ
this document answers questions that web authors ask frequently specifically in connection with firefox and other gecko-based browsers.
... since also other contemporary browsers have a standards mode, activating the standards mode or the almost standards mode in other browsers as well (using the above-mentioned exact doctypes) is the best way to get consistent css layout results across different browsers.
... on the other hand, the quirks implemented in the quirks modes of different browsers vary from browser to browser.
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Drag Operations - Web APIs
for other elements, they must be part of a selection for a default drag to occur.
... in html, apart from the default behavior for images, links, and selections, no other elements are draggable by default.
... to make other html elements draggable, three things must be done: set the draggable="true" on the element that you wish to make draggable.
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Media container formats (file types) - Web media technologies
instead, it streams the encoded audio and video tracks directly from one peer to another using mediastreamtrack objects to represent each track.
...some support only audio while others support both audio and video.
...however, you may also encounter mp3, ogg, webm, avi, and other formats.
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The Implementation of the Application Object Model - Archive of obsolete content
rdf can suck up data from different places (like your bookmarks and history or another web site), and it can combine them.
...for example, the traditional bookmarks tree view could contain anything from mail messages to local files to maps of other sites.
... this same ability to aggregate data leads to another capability of rdf.
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The box model - Learn web development
previous overview: building blocks next everything in css has a box around it, and understanding these boxes is key to being able to create layouts with css, or to align items with other items.
...these characteristics refer to how the box behaves in terms of page flow, and in relation to other boxes on the page: if a box is defined as a block, it will behave in the following ways: the box will break onto a new line.
... padding, margin and border will cause other elements to be pushed away from the box unless we decide to change the display type to inline, elements such as headings (e.g.
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Introduction to CSS layout - Learn web development
css page layout techniques allow us to take elements contained in a web page and control where they are positioned relative to their default position in normal layout flow, the other elements around them, their parent container, or the main viewport/window.
...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 the second paragraph.
... the elements that appear one below the other are described as block elements, in contrast to inline elements, which appear one beside the other, like the individual words in a paragraph.
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Gecko info for Windows accessibility vendors
definitions here are some basic definitions that you'll need for this document to make sense: gecko: the rendering engine for firefox, thunderbird, nvu, mozilla seamonkey and other applications.
...the other differences are not important).
... dom: document object model this is the w3c's specification for how web content is exposed to javascript and other languages.
...And 14 more matches

Building the WebLock UI
in this chapter, however, we are going to be building a user interface for the weblock component that's meant to be added to the existing mozilla browser[other-mozlike-browsers].
...the overlay section, where we discuss how to import scripts, images, and other resources from mozilla into your own ui, is by far the more complicated of the two.
... if the weblock component is being installed in mozilla or another gecko-based browser, then this third section shows you how to create the entry point in the browser for controlling the web locking.
...And 14 more matches

Creating the Component Code
an xpcom component needs to implement at least three interfaces that xpcom requires, and often others as well.
... component registration all xpcom components - whether they're stored in shared libraries (dlls, dsos, dylibs), javascript files, or otherwise - need to be registered before they can be used.
... registration is a process that happens in all xpcom applications, whether they're embedded gecko clients, mozilla, netscape 7, compuserve, or any other software that uses xpcom.
...And 14 more matches

nsIAnnotationService
if they haven't visited a page in a couple of months, they probably aren't interested in many other annotations, the positions of things, or other stuff you create, so put that in the weeks policy.
... do not use characters that are not valid in urls such as spaces, ":", commas, or most other symbols.
...for other types, only c++ consumers may use the type-specific methods.
...And 14 more matches

Debugger - Firefox Developer Tools
it is an accessor property with a getter and setter: assigning to it enables or disables this debugger instance; reading it produces true if the instance is enabled, or false otherwise.
... setting this flag to true is intended for uses of subsystems of the debugger api (e.g, debugger.source) for purposes other than step debugging a target javascript program.
... assigning anything other than a callable value or null to this property throws a typeerror exception.
...And 14 more matches

Key Values - Web APIs
modifier keys | whitespace keys | navigation keys | editing keys | ui keys | device keys | ime and composition keys | function keys | phone keys | multimedia keys | audio control keys | tv control keys | media controller keys | speech recognition keys | document keys | application selector keys | browser control keys | numeric keypad keys special values values of key which have special meanings other than identifying a specific key or character.
... varies varies varies varies modifier keys modifiers are special keys which are used to generate special characters or cause special actions when used in combination with other keys.
...toggles the numeric keypad between number entry some other mode (often directional arrows).
...And 14 more matches

Establishing a connection: The WebRTC perfect negotiation pattern - Web APIs
negotiation is an inherently asymmetric operation: one side needs to serve as the "caller" while the other peer is the "callee." the perfect negotiation pattern smooths this difference away by separating that difference out into independent negotiation logic, so that your application doesn't need to care which end of the connection it is.
... the best thing about perfect negotiation is that the same code is used for both the caller and the callee, so there's no repetition or otherwise added levels of negotiation code to write.
...a polite peer, essentially, is one which may send out offers, but then responds if an offer arrives from the other peer with "okay, never mind, drop my offer and i'll consider yours instead." an impolite peer, which always ignores incoming offers that collide with its own offers.
...And 14 more matches

Viewpoints and viewers: Simulating cameras in WebXR - Web APIs
there are a few articles about the fundamental math, geometry, and other concepts behind webgl and webxr which may be useful to read before or while reading this one, including: explaining basic 3d theory matrix math for the web webgl model view projection geometry and reference spaces in webxr ed.
... by extension, if you and another person are standing in an empty field of solid stone with nothing else visible as far as the eye can see, if you move three meters toward the other person, the result looks the same as if the other person had moved three meters toward you.
... in single-screen 2d games, the camera is not associated directly with the player or any other character in the game, but is instead either fixed above or next to the game play area, or follows the action as the action moves around a scrolling game world.
...And 14 more matches

Lighting a WebXR setting - Web APIs
because the webxr device api relies on other technologies—namely, webgl and frameworks based upon it—to perform all rendering, texturing, and lighting of a scene, the same general lighting concepts apply to webxr settings or scenes as to any other webgl-generated display.
... because the bouncing and scattering of light can be expensive to compute in real time, especially if multiple light sources are involved, it's common to use ambient lighting to simulate the scattered light caused by all the other light sources in the scene, instead of actually calculating the true effect of light scattering.
...due to its directionality, the faces of an object facing a diffuse light source will be brighter than the other faces.
...And 14 more matches

<input>: The Input (Form Input) element - HTML: Hypertext Markup Language
alt valid for the image button only, the alt attribute provides alternative text for the image, displaying the value of the attribute if the image src is missing or otherwise fails to load.
... see the html autocomplete attribute for additional information, including information on password security and how autocomplete is slightly different for hidden than for other input types.
...(only the htmlinputelement’s checked idl attribute is updated.) note: unlike other input controls, a checkboxes and radio buttons value are only included in the submitted data if they are currently checked.
...And 14 more matches

A re-introduction to JavaScript (JS tutorial) - JavaScript
the most common host environment is the browser, but javascript interpreters can also be found in a huge list of other places, including adobe acrobat, adobe photoshop, svg images, yahoo's widget engine, server-side environments such as node.js, nosql databases like the open source apache couchdb, embedded computers, complete desktop environments like gnome (one of the most popular guis for gnu/linux operating systems), and others.
...javascript also supports functional programming — because they are objects, functions may be stored in variables and passed around like any other object.
...they have methods as well that allow you to manipulate the string and access information about the string: 'hello'.charat(0); // "h" 'hello, world'.replace('world', 'mars'); // "hello, mars" 'hello'.touppercase(); // "hello" other types javascript distinguishes between null, which is a value that indicates a deliberate non-value (and is only accessible through the null keyword), and undefined, which is a value of type undefined that indicates an uninitialized variable — that is, a value hasn't even been assigned yet.
...And 14 more matches

Appendix: What you should know about open-source software licenses - Archive of obsolete content
duplication: copying a piece of software distribution: passing a piece of software to another person modification: modifying the software a typical software license will grant these permissions in return for a fee, and will still restrict some normally unrestricted uses.
...pen source definition stipulates the following minimum conditions: the integrity of the author’s source code must be preserved; no discrimination may be made against individuals or organizations; no discrimination may be made based on field of endeavor; no additional licensing can be required when redistributing; license must not be specific to a product; license must not interfere with other software.
...modifications to bsd-licensed software can be published under commercial licenses or other different licenses.
...And 13 more matches

Layout System Overview - Archive of obsolete content
in other words, the same html or xml document could be viewed as a normal galley presentation in a browser window, while simultaneously being presented in a paged presentation to a printer, or even an aural presentation to a speech-synthesizer.
...the style context is associated with the frame via a reference because it is needed for many other computations during the formatting of the frames.
...each frame implements a reflow method to compute its position and size, among other things.
...And 13 more matches

Organizing your CSS - Learn web development
in this article we will take a brief look at some best practices for writing your css to make it easily maintainable, and some of the solutions you will find in use by others to help improve maintainability.
...some developers put all of the rules onto a single line, like so: .box { background-color: #567895; } h2 { background-color: black; color: white; } other developers prefer to break everything onto a new line: .box { background-color: #567895; } h2 { background-color: black; color: white; } css doesn't mind which one you use.
...} 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.
...And 13 more matches

Making decisions in your code — conditionals - Learn web development
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 res...
...else syntax basic if...else syntax looks like the following in pseudocode: if (condition) { code to run if condition is true } else { run some other code instead } here we've got: the keyword if followed by some parentheses.
... a condition to test, placed inside the parentheses (typically "is this value bigger than this other value?", or "does this value exist?").
...And 13 more matches

Component Internals
a set of default libraries stored in this components directory makes up a typical gecko installation, providing functionality that consists of networking, layout, composition, a cross-platform user interface, and others.
... another, even more basic view of this relationship of components to the files and interfaces that define them is shown in onion peel view of xpcom component creation in the next chapter.
...another application may delay this startup until xpcom is needed for the first time.
...And 13 more matches

HTTP Index - HTTP
it was designed for communication between web browsers and web servers, but it can also be used for other purposes.
...this is used to explicitly allow some cross-origin requests while rejecting others.
...this header specifies a comma-delineated list of the http methods which may be used when using cors to access the url specified in the request; if the request is using any other method, this error occurs.
...And 13 more matches

JXON - Archive of obsolete content
all other information (like processing instructions, schemas, comments, etc.) will be lost.
... algorithm #2: a less verbose way here is another, simpler, conversion method, in which nodeattributes are listed under the same object of child nodes but have the “@” prefix (as suggested by the badgerfish convention).
... algorithm #3: a synthetic technique here is another method of conversion.
...And 12 more matches

Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
in this article, i will describe mozilla's quirks mode, which provides strong backwards html compatibility with internet explorer and other legacy browsers.
...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.
... for all other purposes you should check for the feature you need rather than the browsers you think will support that feature.
...And 12 more matches

Anatomy of a video game - Game development
other games demand control over each of the smallest possible individual timeslices.
...modern browsers strive to call methods right as they are needed and idle (or do their other tasks) in the gaps.
... some code needs to be run frame-by-frame so why attach that function to anything other than the browser's redraw schedule?
...And 12 more matches

Getting started with HTML - Learn web development
to get you started, this article defines elements, attributes, and all the other important terms you may have heard.
...you will learn how html elements are structured, how a typical html page is structured, and other important basic language features.
...the enclosing tags can make content into a hyperlink to connect to another page, italicize words, and so on.
...And 12 more matches

Introduction to automated testing - Learn web development
for example, this could be every time you save a file, or at some other point.
...(if you already have node and npm installed, jump to point 4) install it like you would any other program.
... note that node comes with node package manager (npm), which allows you to easily install packages, share your own packages with others, and run useful scripts on your projects.
...And 12 more matches

Package management basics - Learn web development
it makes more sense to use a package manager such as npm, as this will guarantee that the code is added and removed cleanly, as well as a host of other advantages.
... writing the code to include the package(s) in your application (this tends to be done using javascript modules, another subject that is worth reading up on and understanding).
... for example, if your project relied on webpack with a certain configuration, you'd want to ensure that if you installed that project on another machine or returned to it much later on, the configuration would still work.
...And 12 more matches

Localization content best practices
note on localizers mozilla localizers are volunteers with very diverse technical skills: some of them rely exclusively on translation tools, others prefer to work directly with text editors and don't have problems working with vcs systems.
...please select another.
... example: search %1$s for "%2$s" non-directional single, and double, quotation marks should be used in reference to html code, or other languages where ascii character usage is required, such as html.
...And 12 more matches

NSS API Guidelines
the areas which need the most work (both here and throughout the code) is: the relationship of the certificate library with just about every other component (most noticeably pkcs #12, pkcs #7, and pkcs #11) splitting low key and high key components more clearly the crypto wrappers (pkcs #11 wrappers) and high key pkcs #12 and pkcs #5 libraries nss compiles into the libraries described below.
...pkcs #12 can be used to to encode keys, and certificates, for export or import into other applications.
... ssl lib/ssl ssl.h, sslerr.h, sslproto.h, preenc.h secutil provides utility functions and data types used by other libraries.
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PKCS #11 Module Specs
in additions applications/libraries should be able to ignore additional name value pairs which are used to specify configuration for other applications.
...other applications and libraries can safely ignore this line.
...this isn't part of the generic spec (that is other applications need not parse it, nor pkcs #11 modules need supply them or use them).
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Mozilla internal string guide
es will outlive the string instance in addition, there is a special string class, ns[c]autostring, that additionally contains an internal 64-unit buffer (intended primarily for use on the stack), leading to a fourth ownership model: storage within an auto string's stack buffer auto strings will prefer reference counting an existing reference-counted buffer over their stack buffer, but will otherwise use their stack buffer for anything that will fit in it.
... there are a number of additional string classes: classes which exist primarily as constructors for the other types, particularly nsdependent[c]string and nsdependent[c]substring.
...nsliteral[c]string is trivially constructible and destructible, and therefore does not emit construction/destruction code when stored in statics, as opposed to the other string classes.
...And 12 more matches

Getting Started Guide
in fact, if two objects somehow end up owning each other (even transitively) it becomes difficult for either of those object to be reclaimed without adding some `out-of-band' mechanism for breaking the ownership cycle.
... nscomptr manages addref, release, and other red-tape for you.
... */ mfooptr = afooptr; additionally, the class using raw xpcom interface pointers will need a destructor to release mfooptr; and a constructor to ensure that mfooptr is initially set to null (or some other reasonable value).
...And 12 more matches

Debugger.Object - Firefox Developer Tools
this allows the code using each debugger instance to place whatever properties it likes on its own debugger.object instances, without worrying about interfering with other debuggers.
...this accessor may throw if the referent is a scripted proxy or some other sort of exotic object (an opaque wrapper, for example).
... callable true if the referent is a callable object (such as a function or a function proxy); false otherwise.
...And 12 more matches

In depth: Microtasks and the JavaScript runtime environment - Web APIs
when greetuser() calls localgreeting(), another context is created to run that function.
... when greetuser() calls localgreeting(), another context is created to run that function.
... when greetuser() calls localgreeting(), another context is created to run that function.
...And 12 more matches

ARIA Test Cases - Accessibility
screen magnifier should show the focused button or emulate any other standard behavior found in notification dialogs in windows or respective operating systems.
... n/a n/a - fail window-eyes - - - - nvda - n/a - - zoom (leopard) pass n/a pass pass zoom (leopard) pass n/a pass pass zoomtext fail- announced as 'alert' pass - - orca - - - - button basic button button with description dojo nightly build -- lots of other types of buttons there as well.
... when the button is pressed, the menu should be tracked like any other menu.
...And 12 more matches

Content Processes - Archive of obsolete content
the problem with the multiprocess model is that add-ons and content are now in different processes, and scripts in one process cannot interact directly with scripts in another.
...the other emit function is associated with another event emitter: it was passed as an argument to the constructor of this event emitter, and made into a method.
... calling this method causes an event to be emitted on the other event emitter.
...And 11 more matches

lang/type - Archive of obsolete content
globals functions isundefined(value) returns true if value is undefined, false otherwise.
... isnull(value) returns true if value is null, false otherwise.
... isstring(value) returns true if value is a string, false otherwise.
...And 11 more matches

Appendix D: Loading Scripts - Archive of obsolete content
as this module only exists on firefox 4 and other gecko 2-based platforms, the services in question will have to be manually loaded on other platforms.
...these tags are generally inserted into xul overlay files or other xul documents, after which they are automatically loaded into the context of the xul window in question and executed immediately and synchronously.
... flexibility: script tags provide a means to specify the character set and javascript version of the scripts to be loaded, which many other methods do not.
...And 11 more matches

Images, Tables, and Mysterious Gaps - Archive of obsolete content
there's another obvious fix, which is to make sure your document doesn't trigger the "standards"rendering mode.
...isplay: block;} consider this rule when applied to the following markup: <table cellspacing="0" cellpadding="0" border="0" width="500"> <tr><td><img src="nav1.gif"><img src="nav2.gif"><img src="nav3.gif"><img src="nav4.gif"><img src="nav5.gif"></td></tr> <tr><td style="background: red;"> <img src="smallred.gif" height="1" width="1"></td></tr> <tr><td> <p style="margin: 0.5em;">this is text in another cell of the table.
... within the textthere is an icon <img src="icon2.gif"> that indicates a link to another site.
...And 11 more matches

Mozilla Application Framework in Detail - Archive of obsolete content
another benefit of this standards-based approach to ui development is that your application is cross-platform "out of the box".
... unlike many other application frameworks, you are not limited to the widget set we provide, nor limited to the "look and feel" of the native os.
...our platform also can take advantage of other internet standards such as xslt and rdf.
...And 11 more matches

SeaMonkey - making custom toolbar (SM ver. 1.x) - Archive of obsolete content
if you know how to program in javascript, then you can write your own code that does other things.
...use other tutorials and articles to find out more—the main extensions page here is a good starting point.
...seamonkey 2 is being reworked to support the same process as firefox, thunderbird and others.
...And 11 more matches

CSS and JavaScript accessibility best practices - Learn web development
to put it another way, it is important that you consider some best practice advice to make sure that your use of css and javascript doesn't ruin the accessibility of your documents.
... web: <p>visit the <a href="https://www.mozilla.org">mozilla homepage</a>.</p> some very simple link styling is shown below: a { color: #ff0000; } a:hover, a:visited, a:focus { color: #a60000; text-decoration: none; } a:active { color: #000000; background-color: #a60000; } the standard link conventions are underlined and a different color (default: blue) in their standard state, another color variation when the link has previously been visited (default: purple), and yet another color when the link is activated (default: red).
... another tip is to not rely on color alone for signposts/information, as this will be no good for those who can't see the color.
...And 11 more matches

WAI-ARIA basics - Learn web development
as another example, apps started to feature complex controls like date pickers for choosing dates, sliders for choosing values, etc.
...role="navigation" (<nav>) or role="complementary" (<aside>), but there are also others that describe different pages structures, such as role="banner", role="search", role="tabgroup", role="tab", etc., which are commonly found in uis.
... enhancing keyboard accessibility: there are built-in html elements that have native keyboard accessibility; when other elements are used along with javascript to simulate similar interactions, keyboard accessibility and screenreader reporting suffers as a result.
...And 11 more matches

UI pseudo-classes - Learn web development
more recently, the css selector level 3 and css basic ui level 3 added more pseudo-classes related to html forms that provide several other useful targetting conditions that you can take advantage of.
... there are many others too, but the ones listed above are the most obviously useful.
... some of the others are aimed at solving very specific niche problems, or simply not very well supported in browsers yet.
...And 11 more matches

Client-Server Overview - Learn web development
as part of processing the browser may discover links to other resources (e.g.
...the x-frame-options: deny line tells the browser not to allow this page to be embedded in an <iframe> in another site).
...the information is otherwise similar to that for the response to a get request.
...And 11 more matches

Server-side web frameworks - Learn web development
#list our other teams ) team_level = models.charfield(max_length=3,choices=team_levels,default='u11') the django model provides a simple query api for searching the database.
...templates are often used to create html, but can also create other types of document.
... web frameworks often provide a mechanism to make it easy to generate other formats from stored data, including json and xml.
...And 11 more matches

Website security - Learn web development
in other high-profile cases, millions of passwords, email addresses, and credit card details have been leaked into the public domain, exposing website users to both personal embarrassment and financial risk.
...other attacks can be mitigated through your web server configuration, for example by enabling https.
... cross-site scripting (xss) xss is a term used to describe a class of attacks that allow an attacker to inject client-side scripts through the website into the browsers of other users.
...And 11 more matches

Strategies for carrying out testing - Learn web development
note: you can only have one version of ie or edge installed on a machine at once, so you will probably have to use virtual machine, or other strategy to do the testing you need.
... the next page provides you with some code snippets and other instructions.
..."we have no firefox mobile users" might lead you to not bother supporting firefox mobile.
...And 11 more matches

Accessibility API cross-reference
an interesting problem is that mozilla, safari/khtml, opera, staroffice and other apps are cross-platform, but there is currently no cross-platform accessibility api.
... aria is a standard developed as part of the web accessibility initiative, which uses markup syntax quite familiar to users of html, xml, sgml and others.
...aria can be used to 'fill out' the missing semantics of html, but may also be used in other markup languages (such as svg) and expresses semantics using attributes, compared with html, which tends to have distinct named elements for its roles.
...And 11 more matches

Using XPCOM Components
« previousnext » one of the best ways to begin working with xpcom - especially when you are designing the interface to a component that will be used by others, as we do in starting weblock - is to look at how clients are already using xpcom components.
...in fact, virtually all of the functionality that you associate with a browser - navigation, window management, managing cookies, bookmarks, security, searching, rendering, and other features - is defined in xpcom components and accessed by means of those component interfaces.
...the interfaces are public, in other words, and the implementations are private[private-xpcom-interfaces].
...And 11 more matches

Using XPCOM Utilities to Make Things Easier
though they overlap somewhat (e.g., high-level macros expand to other macros), they fall into the following general categories.
... the module macros include one set of macros that define the exported nsgetmodule entry point, the required nsimodule implementation code and another that creates a generic factory for your implementation class.
...the four required parts[other-parts] of the structure contain the following information: a human readable class name the class id (cid) the contract id (an optional but recommended argument) a constructor for the given object static const nsmodulecomponentinfo components[] = { { "pretty class name", cid, contract_id, constructor }, // ...
...And 11 more matches

nsIDOMWindowUtils
true if it's open, otherwise false.
..."basic" is unaccelerated; other types are accelerated.
... paintingsuppressed boolean true if painting is currently suppressed for this window; otherwise false.
...And 11 more matches

WebRTC connectivity - Web APIs
this article describes how the various webrtc-related protocols interact with one another in order to create a connection and transfer data and/or media among peers.
...the description includes information about the kind of media being sent, its format, the transfer protocol being used, the endpoint's ip address and port, and other information needed to describe a media transfer endpoint.
... when a user starts a webrtc call to another user, a special description is created called an offer.
...And 11 more matches

Background audio processing using AudioWorklet - Web APIs
with the processor registered, you can create a new audioworkletnode which passes the audio through the processor's code when the node is linked into the chain of audio nodes along with any other audio nodes.
... connect the created audioworkletnodes into your audio processing pipeline as you would any other node, then use your audio pipeline as usual.
... glitch project page see the code try it live creating an audio worklet processor fundamentally, an audio worklet processor (which we'll refer to usually as either an "audio processor" or simply as a "processor" because otherwise this article will be about twice as long) is implemented using a javascript module that defines and installs the custom audio processor class.
...And 11 more matches

window.postMessage() - Web APIs
normally, scripts on different pages are allowed to access each other if and only if the pages they originate from share the same protocol, port number, and host (also known as the "same-origin policy").
... broadly, one window may obtain a reference to another (e.g., via targetwindow = window.opener), and then dispatch a messageevent on it with targetwindow.postmessage().
... message data to be sent to the other window.
...And 11 more matches

position - CSS: Cascading Style Sheets
the offset does not affect the position of any other elements; thus, the space given for the element in the page layout is the same as if position were static.
...it is positioned relative to its closest positioned ancestor, if any; otherwise, it is placed relative to the initial containing block.
...the margins of absolutely positioned boxes do not collapse with other margins.
...And 11 more matches

Redirections in HTTP - HTTP
they imply that the original url should no longer be used, and replaced with the new one.search engine robots, rss readers, and other crawlers will update the original url for the resource.
... others may or may not be changed to get.[1] reorganization of a web site.
... temporary redirections sometimes the requested resource can't be accessed from its canonical location, but it can be accessed from another place.
...And 11 more matches

Digital audio concepts - Web media technologies
sound enters the computer through a microphone or other input in the form of a stream of electrons whose voltage varies to represent the amplitude of the sound wave.
...the more samples you take, the smoother the wave becomes.
...most audio files use 16-bit signed integers for each sample, but others use 32-bit floating-point values or 24-bit or 32-bit integers.
...And 11 more matches

Image file type and format guide - Web media technologies
bit depth, on the other hand, is the total number of bits used to represent each pixel in memory.
... apng is ideal for basic animations that do not need to synchronize to other activities or to a sound track, such as progress indicators, activity throbbers, and other animated sequences.
... while other data representations are defined in the specification, they are not widely used and often completely unimplemented.
...And 11 more matches

Understanding WebAssembly text format - WebAssembly
so this is similar to functions in other languages, even if it looks different because it is an s-expression.
... there is another issue here — using numeric indices to refer to items can be confusing and annoying, so the text format allows you to name parameters, locals, and most other items simply by including a name prefixed by a dollar symbol ($) just before the type declaration.
... calling functions from other functions in the same module the call instruction calls a single function, given its index or name.
...And 11 more matches

StringView - Archive of obsolete content
ew in javascript) based upon the javascript arraybuffer interface to create a highly extensible library that anyone can extend by adding methods to the object stringview.prototype to create a collection of methods for such string-like objects (since now: stringviews) which work strictly on arrays of numbers rather than on creating new immutable javascript strings to work with unicode encodings other than javascript's default utf-16 domstrings introduction as web applications become more and more powerful, adding features such as audio and video manipulation, access to raw data using websockets, and so forth, it has become clear that there are times when it would be helpful for javascript code to be able to quickly and easily manipulate raw binary data.
...nstartidx + nlength : ninptlen); break typeswitch; default: /* the input argument is an array or another serializable object: a new typedarray will be created.
...*/ for (var ninptidx = nstartidx, noutptidx = 0; noutptidx < noutptlen; ninptidx += fgetinptchrsize(nchrcode)) { nchrcode = fgetinptchrcode(vsource, ninptidx); noutptidx = fputoutptcode(awhole, nchrcode, noutptidx); } break conversionswitch; case 4: /* domstring to ascii or binarystring or other unknown encodings */ awhole = new ftaview(noutptlen); /* transcription...
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Custom toolbar button - Archive of obsolete content
if you know how to program in javascript, then you can write your own code that does other things.
...use other tutorials and articles to find out more—the main extensions page here is a good starting point.
... note: there is a similar tutorial for seamonkey 1.x on the page: custom toolbar button:seamonkey earlier versions and other mozilla applications also support extensions, but some parts of this tutorial are not appropriate for them.
...And 10 more matches

Templates - Archive of obsolete content
however, you can use other elements if you want although they are more useful for specialized cases.
... nevertheless, we'll start with these other elements because trees and menus require more code.
... this example and any others that reference internal rdf datasources will only work if you load them from a chrome url.
...And 10 more matches

XUL element attributes - Archive of obsolete content
otherwise, events are passed to the element only.
...when multiple datasources are used, one may override an assertion from another.
...when multiple datasources are used, one may override an assertion from another.
...And 10 more matches

Gecko FAQ - Gecko Redirect 1
gecko is the open source browser engine designed to support open internet standards such as html 5, css 3, the w3c dom, xml, javascript, and others.
... gecko is used in multiple browsers, including mozilla firefox, seamonkey, and others.
...in other words, gecko will not only be displaying the document's content, but it will also be painting the scrollbars, toolbars, and menus on the screen as well.
...And 10 more matches

Fundamental text and font styling - Learn web development
here we'll go through all the basic fundamentals of text/font styling in detail, including setting font weight, family and style, font shorthand, text alignment and other effects, and line and letter spacing.
...text content effectively behaves like a series of inline elements, being laid out on lines adjacent to one another, and not creating line breaks until the end of the line is reached, or unless you force a line break manually using the <br> element.
... 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.
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Client-side form validation - Learn web development
minlength and maxlength: specifies the minimum and maximum length of textual data (strings) min and max: specifies the minimum and maximum values of numerical input types type: specifies whether the data needs to be a number, an email address, or some other specific preset type.
... when an element is invalid, the following things are true: the element matches the :invalid css pseudo-class, and sometimes other ui pseudo-classes (e.g., :out-of-range) depending on the error, which lets you apply a specific style to invalid elements.
... validating against a regular expression another useful validation feature is the pattern attribute, which expects a regular expression as its value.
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Advanced text formatting - Learn web development
previous overview: introduction to html next there are many other elements in html for formatting text, which we didn't get to in the html text fundamentals article.
...here you'll learn about marking up quotations, description lists, computer code and other related text, subscript and superscript, contact information, and more.
...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.
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Introduction to events - Learn web development
the example output is as follows: it's not just web pages another thing worth mentioning at this point is that events are not unique to javascript — most programming languages have some kind of event model, and the way the model works often differs from javascript's way.
... in fact, the event model in javascript for web pages differs from the event model for javascript as it is used in other environments.
... you don't need to understand anything about other such environments at this stage in your learning; we just wanted to make it clear that events can differ in different programming environments.
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Introduction to the server side - Learn web development
it can even allow interaction with users of the site, sending notifications and updates via email or through other channels.
... a dynamic site can return different data for a url based on information provided by the user or stored preferences and can perform other operations as part of returning a response (e.g.
...web frameworks are collections of functions, objects, rules and other code constructs designed to solve common problems, speed up development, and simplify the different types of tasks faced in a particular domain.
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Getting started with React - Learn web development
it's used with other libraries to render to certain environments.
... for instance, react native can be used to build mobile applications; react 360 can be used to build virtual reality applications; and there are other possibilities besides.
...react and reactdom are often discussed in the same spaces as — and utilized to solve the same problems as — other true web development frameworks.
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Introduction to cross browser testing - Learn web development
you need to think about: different browsers other than the one or two that you use regularly on your devices, including slightly older browsers that some people might still be using, which don't support all the latest, shiniest css and javascript features.
... on the other hand, it is not ok for a site to work fine for sighted users, but be completely inaccessible for visually impaired users because their screen reader application can't read any of the information stored on it.
...as a web developer, you need to agree on a range of browsers and devices that the code definitely needs to work on with the site owner, but beyond that, you need to code defensively to give other browsers the best chance possible of being able to use your content.
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Setting up your own test automation environment - Learn web development
there are other ways, but the best way to use selenium is via webdriver, a powerful api that builds on top of selenium and makes calls to a browser to automate it, carrying out actions such as "open this web page", "move over this element on the page", "click this link", "see whether the link opens this url", etc.
... note: if you want to find out how to use webdriver with other server-side environments, also check out platforms supported by selenium for some useful links.
... create another new file inside your project directory called google_test_multiple.js.
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Mozilla Quirks Mode Behavior
add padding if the very first node in an li is another ul or ol (bug 98636).
... (this also applies to getelementsbyclassname.) stylesheets linked in the document with an advisory mime type of text/css will still be treated as css even if the server gives a content-type header other than text/css.
... the css parser interprets unitless numbers as px (except for line-height and any other properties where they have distinct meaning, and except in shorthands).
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Introduction to NSPR
the netscape portable runtime (nspr) api allows compliant applications to use system facilities such as threads, thread synchronization, i/o, interval timing, atomic operations, and several other low-level services in a platform-independent manner.
...each thread is an execution entity that is scheduled independently from other threads in the same process.
...this, and the fact that threads share an address space with other threads in the same process, makes it important to remember that threads are not processes .
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Shell global objects
unwrappedobjectshavesameshape(obj1, obj2) returns true iff obj1 and obj2 have the same shape, false otherwise.
...if an error occurred, throw the appropriate exception; otherwise, run the script and return its value.
...if an error occurred, throw the appropriate exception; otherwise, return the module object timeout([seconds], [func]) get/set the limit in seconds for the execution time for the current context.
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EventTarget.addEventListener() - Web APIs
if a passive listener does call preventdefault(), the user agent will do nothing other than generate a console warning.
...event bubbling and capturing are two ways of propagating events that occur in an element that is nested within another element, when both elements have registered a handle for that event.
...that means that if the browser checks the value of the passive property on the options object, passivesupported will be set to true; otherwise, it will remain false.
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Typical use cases of Flexbox - CSS: Cascading Style Sheets
in this guide we will take a look at some of the common use cases for flexbox — those places where it makes more sense than another layout method.
... in a perfect world of browser support, the reason you'd choose to use flexbox is because you want to lay a collection of items out in one direction or another.
...you can read more about the difference between flexbox and css grid layout in relationship of flexbox to other layout methods, where we discuss how flexbox fits into the overall picture of css layout.
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Grammar and types - JavaScript
(spaces, tabs, and newline characters are considered whitespace.) comments the syntax of comments is the same as in c++ and in many other languages: // a one line comment /* this is a longer, * multi-line comment */ /* you can't, however, /* nest comments */ syntaxerror */ comments behave like whitespace, and are discarded during script execution.
...for example: var n = null; console.log(n * 32); // will log 0 to the console variable scope when you declare a variable outside of any function, it is called a global variable, because it is available to any other code in the current document.
... if (true) { let y = 5; } console.log(y); // referenceerror: y is not defined variable hoisting another unusual thing about variables in javascript is that you can refer to a variable declared later, without getting an exception.
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Chapter 5: Let's build a Firefox extension - Archive of obsolete content
for example, in the firefox browser window, everything other than the web page being displayed in the content area is chrome.
... normal overlay: adding the xul-overlay instruction to the target xul document overlays it with another xul document cross-package overlay: adding a cross manifest permits one xul file to overlay another without any xul-overlay instruction.
...assuming you’ve done that, you’ll be able to confirm the changes to overlay.xul and clock.xul without the bother of relaunching firefox or reinstalling the extension.
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Menus - Archive of obsolete content
submenus may be created by nesting one menu inside of another.
...instead of creating a standard button, this will create a button with a small arrow or other indicator.
...this works just like it does for other buttons.
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OpenClose - Archive of obsolete content
for menupopups attached to other elements using the popup or context attributes, see opening a popup below.
... as with other ways of opening a menu, the popupshowing event will be fired to provide an opportunity to customize the commands that appear on the menu.
... if the menu is a child of another menu and the parent menu is not open.
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Anonymous Content - Archive of obsolete content
xbl content xbl can be used to automatically add a set of elements inside another element.
...this is useful for creating a single widget that is made up of a set of other widgets, but can be referred to as only a single widget.
...these elements would in turn be bound to other bindings that use the base xul elements.
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Document Object Model - Archive of obsolete content
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.
... function gettext(){ return "message"; } alert(gettext()); alert(window.gettext()); thus, if you want to access variables or call a function declared in a script used by another window, you just need to access it using the other window's window object.
... for example, if we combined the last two examples into a single file, we might want to call the gettext() function from within the other window (for example, the test.xul window).
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Archived Mozilla and build documentation - Archive of obsolete content
because of this close association between methods and attributes on the one hand, and content on the other, calicalendarview implementations are particularly well suited to xbl.
...a sequence of characters) that matches patterns of characters in other strings.
... devmo 1.0 launch roadmap comments, ideas, questions and other discussion should be added on the devmo talk:1.0 launch roadmap page.
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The Business Benefits of Web Standards - Archive of obsolete content
a lot of other sites would greatly increase their seo by simply using proper tags for the content.
...while some browsers have quirks that cause different behavior by platform, mozilla-based browsers are designed to behave identically on all supported platforms (mac, linux, unix, windows...) web content is increasingly being accessed by a growing number of user agents other than browsers, or by browsers on different platforms - for example mobile telephones.
...familiarity with dreamweaver or any other legacy software is not a good basis for hiring creative development personnel.
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What is CSS? - Learn web development
a document is usually a text file structured using a markup language — html is the most common markup language, but you may also come across other markup languages such as svg or xml.
...there are other user agents available — such as those which convert html and css documents into pdfs to be printed.
... a css stylesheet will contain many such rules, written one after the other.
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Styling links - Learn web development
link states the first thing to understand is the concept of link states — different states that links can exist in, which can be styled using different pseudo-classes: link (unvisited): the default state that a link resides in, when it isn't in any other state.
...you should at least: use underlining for links, but not for other things.
... if you don't want to underline links, at least highlight them in some other way.
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Creating hyperlinks - Learn web development
hyperlinks allow us to link documents to other documents or resources, link to specific parts of documents, or make apps available at a web address.
... almost any web content can be converted to a link so that when clicked or otherwise activated the web browser goes to another web address (url).
... anatomy of a link a basic link is created by wrapping the text or other content, see block level links, inside an <a> element and using the href attribute, also known as a hypertext reference, or target, that contains the web address.
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Graceful asynchronous programming with Promises - Learn web development
since getusermedia() has to ensure that the user has permission to use those devices and ask the user which microphone to use and which camera to use (or whether to be a voice-only call, among other possible options), it can block until not only all of those decisions are made, but also the camera and microphone have been engaged.
...it then calls getusermedia(), asking for a stream that has both video and audio tracks, then once that's been obtained, sets up a video element to show the stream coming from the camera as a "self view," then takes each of the stream's tracks and adds them to the webrtc rtcpeerconnection representing a connection to another user.
...mething like this: choosetoppings(function(toppings) { placeorder(toppings, function(order) { collectorder(order, function(pizza) { eatpizza(pizza); }, failurecallback); }, failurecallback); }, failurecallback); this is messy and hard to read (often referred to as "callback hell"), requires the failurecallback() to be called multiple times (once for each nested function), with other issues besides.
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Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
it's important to know that you can (and often will) run other code before a settimeout() call executes, or between iterations of setinterval().
...(in other words, when the stack is empty.) you will learn more on this matter as you progress through this article.
... in any case, these functions are used for running constant animations and other background processing on a web site or application.
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Client-side storage - Learn web development
you will see that if you load two websites (say google.com and amazon.com) and try storing an item on one website, it won't be available to the other website.
... this makes sense — you can imagine the security issues that would arise if websites could see each other's data!
... note: there is another, slightly more complex example to explore at using the web storage api.
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What is JavaScript? - Learn web development
it is the third layer of the layer cake of standard web technologies, two of which (html and css) we have covered in much more detail in other parts of the learning area.
...(okay, not everything, but it is amazing what you can achieve with a few lines of javascript code.) the three layers build on top of one another nicely.
... apis are ready-made sets of code building blocks that allow a developer to implement programs that would otherwise be hard or impossible to implement.
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Displaying Places information using views
you may specify as few or as many of these magic columns as you want, and your tree may of course contain other columns as well.
...this is useful when you need the id for another purpose or when a treecol is contained in anonymous content, as in xbl.
...if you need to display additional data or otherwise require more control over your view, you may need to write your own.
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Script security
the rules for determining whether an object is same-origin with another, and what access is allowed cross-origin, are now mostly standardized across browsers.
... security policy gecko implements the following security policy: objects that are same-origin are able to access each other freely.
... 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.
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HTTP Cache
other parallel openers of the same cache entry are blocked (wait) for invocation of their oncacheentryavailable until one of the following occurs: the writer simply throws the entry away: other waiting opener in line gets the entry again as "new", the cycle repeats.
... the writer stored all necessary meta data in the cache entry and called metadataready on it: other consumers now get the entry and may examine and potentially modify the meta data and read the data (if any) of the cache entry.
... when the writer still keeps the cache entry and has open and keeps open the output stream on it, other consumers may open input streams on the entry.
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IPDL Tutorial
the c++ signature will accept a pprotocolparent* on one side and convert it to a pprotocolchild* on the other.
...maybe); }; custom primitive types when you need to send data of a type other than one built into ipdl, you can add a using declaration in an ipdl specification.
... struct namevaluepair { nscstring name; nscstring value; }; in implementation code, these structs can be created and used like so: namevaluepair entry(astring, anotherstring); foo(entry.name(), entry.value()); // named accessor functions return references to the members arrays ipdl has simple syntax for arrays: invokemethod(nscstring[] args); in c++ this is translated into a nstarray reference: virtual bool recvinvokemethod(nstarray<nscstring>& args); ipdl's generated data structures can be used in several protocols if they are defined in a separate...
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source-editor.jsm
ignorecase boolean true if the search was case sensitive; otherwise false.
... return value true if there are changes that can be redone, otherwise false.
... return value true if there are changes that can be undone, otherwise false.
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Hacking Tips
it is separated in 2 parts, one section related to debugging and another section related to drafting optimizations.
...external programs such as iongraph, dot, and your png viewer are search into the path, otherwise custom one can either be configured with environment variables (gdb_iongraph, gdb_dot, gdb_pngviewer) before starting gdb, or with gdb parameters (set iongraph-bin <path>, set dot-bin <path>, set pngviewer-bin <path>) within gdb.
... one way to investigate is to let valgrind start gdb for you, the other way documented here is to let valgrind act as a gdb server which can be manipulated from the gdb remote.
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TPS Tests
} note that in this example, the foobar@restmail.net account must be registered on stage, otherwise authentication will fail (and the whole test will fail as well.
...typically there are two profiles used, but any number of profiles could be used in theory (other than 0).
... phase implementation (mandatory) it's worth noting that some parts of tps assume that it can read the number off the end of the phase or profile to get to the next one, so try to stick to the convention established in the other tests.
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Gecko Roles
role_window represents the window frame, which contains child objects such as a title bar, client, and other objects contained in a window.
... role_grouping logically groups other objects.
... role_statictext represents read-only text, such as labels for other controls or instructions in a dialog box.
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nsIAccessibleRole
role_window 9 represents the window frame, which contains child objects such as a title bar, client, and other objects contained in a window.
... role_grouping 20 logically groups other objects.
... role_statictext 41 represents read-only text, such as labels for other controls or instructions in a dialog box.
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nsITreeView
return value true if a drop is allowed at the current location; otherwise false.
...otherwise false.
...otherwise false.
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nsIURI
vice.newuri(aurl, aorigincharset, abaseuri); } components of a uri prepath path scheme userpass host port ref ftp :// username@password @ hostname : portnumber /pathname?query=value #ref method overview nsiuri clone(); nsiuri cloneignoringref(); boolean equals(in nsiuri other); boolean equalsexceptref(in nsiuri other); autf8string resolve(in autf8string relativepath); boolean schemeis(in string scheme); attributes attribute type description asciihost acstring the uri host with an ascii compatible encoding.
...other parts are url-escaped per the rules of rfc3986.
... if this value is something other than utf-8 then the uri components (for example spec, prepath, username, and so on) are all fully url-escaped.
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nsIZipWriter
if the operation is performed on the queue then the channel will be opened asynchronously, otherwise the channel must support being opened synchronously.
... ns_error_in_progress the zip writer is already performing another operation.
... ns_error_in_progress the zip writer is already performing another operation.
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XPIDL
types can of course be one of the fundamental types, or any other type declared via a typedef, interface, or a native type.
... other webidl types (e.g.
...furthermore, interfaces can also inherit from another interface.
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Using images - Web APIs
you can even use the image produced by other canvas elements on the same page as the source!
... importing images into a canvas is basically a two step process: get a reference to an htmlimageelement object or to another canvas element as a source.
... htmlcanvaselement you can use another <canvas> element as your image source.
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Using microtasks in JavaScript with queueMicrotask() - Web APIs
this lets the given function run without the risk of interfering with another script's execution, yet also ensures that the microtask runs before the user agent has the opportunity to react to actions taken by the microtask.
... javascript promises and the mutation observer api both use the microtask queue to run their callbacks, but there are other times when the ability to defer work until the current event loop pass is wrapping up.
... the event loop driving your code handles these tasks one after another, in the order in which they were enqueued.
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Fundamentals of WebXR - Web APIs
mixed reality is a large and complex subject, with much to learn and many other apis to bring together in order to create an engaging experience for users.
...this includes both managing the process of rendering the views needed to simulate the 3d experience and the ability to sense the movement of the headset or other motion sensing apparatus to provide the needed data to let you update the imagery shown to the user based on that movement.
... another key difference is that webxr has integrated support for the advanced input controllers that are used with most mixed reality headsets, while webvr relied on the gamepad api to support the controllers.
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Geometry and reference spaces in WebXR - Web APIs
however, in order to provide the ability to present scenes in true 3d using xr headsets and other such equipment, webxr has additional concepts that must be understood.
... in this article, we introduce the ways in which webxr expands upon the geometry of webgl, and how the positions and orientations of objects—both physical and virtual—are described in relation to one another using spaces and, in particular, reference spaces.
... the article spatial tracking in webxr builds upon the information provided here to cover how the physical position and orientation of the user's head, as well as potentially other parts of their body such as the hands, are mapped into the digital world, as well as how the relative positions of both physical and virtual objects are tracked as they move around, so that the scene can be properly rendered and composited.
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Starting up and shutting down a WebXR session - Web APIs
otherwise, the polyfill falls back to an implementation which uses google's cardboard vr api.
...additionally, it is updated to maintain compatibility with browsers as their support for webxr and other technologies related to it and to the implementation of the polyfill change over time.
... other improvements include updating the emulator to rename the xr interface to xrsystem, introduce support for squeeze (grip) input sources, and add support for the xrinputsource property profiles.
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Cognitive accessibility - Accessibility
other permanent cognitive impairments include aphasia, speech and language, autism, add/adhd, dyslexia, and dyscalculia.
...another form it can take is depression, such as when mourning the loss of a loved one, or being momentarily saddened by a tweet or video they just saw online.
... if moving, blinking, scrolling, or auto-updating information starts automatically, lasts more than five seconds, and is presented in parallel with other content, the user must able to pause, stop, hide or control it, unless it's an essential functionality.
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Perceivable - Accessibility
guideline 1.1 — providing text alternatives for non-text content the key here is that text can be converted to other forms that people with disabilities can use.
...see other text alternative mechanisms for the argument against longdesc.
... see text alternatives for static caption options, and audio transcripts, video text tracks, and other multimedia content for other alternatives.
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Browser detection using the user agent - HTTP
also, experts, or simply people with another point of view, can give you ideas for working around the bug.
...browser makers do pay attention to bug reports, and the analysis may hint about other workarounds for the bug.
...this is the worst reason to use user agent detection because odds are eventually all the other browsers will catch up.
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Functions - JavaScript
in javascript, functions are first-class objects, because they can have properties and methods just like any other object.
... what distinguishes them from other objects is that functions can be called.
... to return a value other than the default, a function must have a return statement that specifies the value to return.
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Authoring MathML - MathML
html becomes verbose when your document contains advanced structures like lists or tables but fortunately there are many generators from simple notations, wysiwyg editors and other content management systems to help writing web pages.
...of course, the list is by no means exhaustive and you are invited to check out the w3c mathml software list where you can find various other tools.
...there is also a similar script to display a warning at the top of the page for browsers without good mathml support and let the users choose between one of the fallback above: <script src="https://fred-wang.github.io/mathml-warning.js/mpadded-min.js"></script> if you don't want to use this link to github but instead to integrate these polyfills or others in your own project, you might need the detection scripts to verify the level of mathml support.
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Content Scripts - Archive of obsolete content
there are five basic principles: the add-on's main code, including "main.js" and other modules in "lib", can use the sdk high-level and low-level apis, but can't access web content directly content scripts can't use the sdk's apis (no access to globals exports, require) but can access web content sdk apis that use content scripts, like page-mod and tabs, provide functions that enable the add-on's main code to load content scripts into web pages content scripts can be loaded in a...
... a message-passing api allows the main code and content scripts to communicate with each other this complete add-on illustrates all of these principles.
...b.attach({ contentscript: ['document.body.style.border = "5px solid red";', 'window.alert("hi");'] }); }); // main.js var data = require("sdk/self").data; var pagemod = require("sdk/page-mod"); pagemod.pagemod({ include: "*.mozilla.org", contentscriptfile: [data.url("jquery.min.js"), data.url("my-content-script.js")] }); if you do this, the scripts can interact directly with each other, just like scripts loaded by the same web page.
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Intercepting Page Loads - Archive of obsolete content
some of the techniques presented here apply only to content loaded in the main browser area, while others detect content being loaded in other xul windows, or even detect xul content being loaded.
...you can close the tab, redirect the tab to about:blank or another page, or tell the browser to stop loading this page, but in general you don't want to do this because it will be visible to the user and it will look like a bug.
... http observers another common way of detecting and intercepting loads is using http observer topics.
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JavaScript Object Management - Archive of obsolete content
« previousnext » chrome javascript in this section we'll look into how to handle javascript data effectively, beginning with chrome code, in ways which will prevent pollution of shared namespaces and conflicts with other add-ons resulting from such global namespace pollution.
... the first step to good javascript object management is having a namespace, or a javascript object that contains our code and data, that you know will not conflict with firefox code or other extensions.
... javascript has a host of features that make it extremely flexible, but it also has some disadvantages, as it is not as strict as other languages, such as java.
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The Box Model - Archive of obsolete content
an hbox is oriented horizontally by default, meaning that its child nodes are displayed next to each other from left to right.
... a vbox is oriented vertically by default, its child nodes displayed one below the other from top to bottom.
...the same applies to a vbox, but in the other direction.
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Source code directories overview - Archive of obsolete content
tools contains scripts for automatically generating certain source code and other special tools for building this module.
...the format of the date and time for different cultures) and other localization facilities.
...it includes all the code for managing mail, reading newsgroup messages, importing other mail formats, composing new messages and so on.
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Style System Overview - Archive of obsolete content
style system style sheets & rules ↓ rule tree ↓ style context interface style sheets & rules nsistyleruleprocessor and nsistylesheet describe in c++ what a css stylesheet can do nsistylerule describes in c++ what a css style rule can do main implementations are for css, but we have other implementations in c++ that: do what css can't do do things faster than css would css style sheets at basic level, sheet is collection of rules other special things: @import, @media, @namespace, etc.
... detail: !important declarations cause an extra rule object cssimportantrule to be created since they are in a separate part of the cascade other nsistylerule implementations nshtmlmappedattributes represents stylistic html attributes turned into a style rule (one instance per unique set of attributes) bodyrule handles marginwidth/marginheight mixes on body and on frame.
... various rules in nshtmlstylesheet.cpp do other things with presentational color-related attributes and with tables.
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TCP/IP Security - Archive of obsolete content
other commonly used protocols at the network layer are internet control message protocol (icmp) and internet group management protocol (igmp).
... another good source of information is nist sp 800-52, guidelines on the selection and use of transport layer security, available from https://csrc.nist.gov/publications/nistpubs/.) the use of tls typically requires each application to support tls; however, unlike application layer controls, which typically involve extensive customization of the application, transport layer controls such as tls are much l...
... another advantage of network layer controls is that since ip information (e.g., ip addresses) is added at this layer, the controls can protect both the data within the packets and the ip information for each packet.
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Game promotion - Game development
if you make a good game for a competition and win some prizes in the process your game will automatically be promoted by the organizers and other attendees.
...continually publishing information about your games will help educate others, increase your reputation in the community, and further improve seo.
... social media your social media presence is very important — follow the right hashtags, make friends, engage in conversations, help other devs in need.
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Cascade and inheritance - Learn web development
while working through this lesson may seem less immediately relevant and a little more academic than some other parts of the course, an understanding of these things will save you much pain later on!
... let's start by taking a quick look at the key things we are dealing with, then we'll look at each in turn and see how they interact with each other and your css.
... we'll explain specificity scoring and other such things later on.
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CSS values and units - Learn web development
<percentage> a <percentage> represents a fraction of some other value, for example 50%.
... percentage values are always relative to another quantity, for example an element's length is relative to its parent element's length.
...the benefit of using relative units is that with some careful planning you can make it so the size of text or other elements scale relative to everything else on the page.
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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.
...or if you want to create a ui element that floats over the top of other parts of the page, and/or always sits in the same place inside the browser window no matter how much the page is scrolled?
...this is very similar to static positioning, except that once the positioned element has taken its place in the normal layout flow, you can then modify its final position, including making it overlap other elements on the page.
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Document and website structure - Learn web development
basic sections of a document webpages can and will look pretty different from one another, but they all tend to share similar standard components, unless the page is displaying a fullscreen video or game, is part of some kind of art project, or is just badly structured: header: usually a big strip across the top with a big heading, logo, and perhaps a tagline.
... this usually stays the same from one webpage to another.
...like the header, this content usually remains consistent from one webpage to another — having inconsistent navigation on your website will just lead to confused, frustrated users.
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Third-party APIs - Learn web development
third party apis, on the other hand, are located on third party servers.
... other apis may require that you include the key in a slightly different way, but the pattern is relatively similar for most of them.
... extending the mapquest example let's add some more functionality to the mapquest example to show how to use some other features of the api.
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Getting started with Svelte - Learn web development
svelte: a new approach to building rich user interfaces svelte provides a different approach to building web apps than some of the other frameworks covered in this module.
...it arguably has fewer concepts and tools to learn than some of the other framework options.
... it extends css by adding a scoping mechanism, allowing each component to define their own styles without the risk of clashing with other component's styles.
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Advanced Svelte: Reactivity, lifecycle, accessibility - Learn web development
and that makes sense, because otherwise svelte would be aware of the inner workings of the foreach() method; the same would therefore be true for any method attached to any object or array.
... another solution is to assign a new array to todos containing a copy of all the todos with the completed property updated accordingly, like this: const checkalltodos = (completed) => { todos = todos.map(t => { // shorter version: todos = todos.map(t => ({...t, completed})) return {...t, completed: completed} }) } in this case we are using the map() method, which returns a new a...
... add the following import statement below the others inside todos.svelte: import newtodo from './newtodo.svelte' and update the addtodo() function like so: function addtodo(name) { todos = [...todos, { id: newtodoid, name, completed: false }] } addtodo() now receives the name of the new todo directly, so we no longer need the newtodoname variable to give it its value.
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Command line crash course - Learn web development
a large number of tools can be used by typing commands into the command line; many come pre-installed on your system, and a huge number of others are installable from package registries.
... windows as with some other programming tools, using the terminal (or command line) on windows has traditionally not been as simple or easy as on other operating systems.
...if you wanted to go to a directory called src, located inside a directory called project, located on the desktop, you could type these three commands to get there from your home folder: cd desktop cd project cd src but this a waste of time — instead, you can type one command, with the different items in the path separated by forward slashes, just like you do when specifying paths to images or other assets in css, html, or javascript code: cd desktop/project/src note that including a leading slash on your path makes the path absolute, for example /users/your-user-name/desktop.
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Client-side tooling overview - Learn web development
you can also find linting tools for other languages, such as csslint.
...there is usually a way of controlling and coordinating what changes are made to the "master" copy of the code, and when, so a team of developers doesn’t end up overwriting each other’s work all the time.
... webpack is another very popular packaging tool that does similar things.
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The Firefox codebase: CSS Guidelines
also, it is good practice to introduce a common class when the new element you are styling reuses some styles from another element, this allows the maintenance cost and the amount of code duplication to be reduced.
... other tips assume ="true" in attribute selectors.
... once the two things above have been checked, check if the other rule you are overriding contains !important, if that is case, try putting it in question, because it might have become obsolete.
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IME handling guide
this is a technical term from windows but these days, this is used on other platforms as well.
...otherwise, we call it "ime is open".
... one of the other important jobs of this is, when a focused editor handles a dispatched ecompositionchange event, this modifies the stored composition string and its clause information.
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about:memory
it also lets you do other memory-related operations like trigger gc and cc, dump gc & cc logs, and dump dmd reports.
... note that in both cases the generated data contains privacy-sensitive details such as the full list of the web pages you have open in other tabs.
...this will cause the privacy-sensitive data to be stripped out, but it may also make it harder for others to investigate the memory usage.
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Mozilla Projects
mozilla has a number of projects other than firefox itself.
... many of these are components of firefox or are tools used to create firefox, but may be used by other projects as well.
... compare-locales compare-locales is a python script that helps localizers to check their work without running firefox or another application.
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Observer Notifications
unless otherwise noted you register for the topics using the nsiobserverservice.
... topic description browser:purge-session-history sent when the sanitizer runs to purge all history and other information.
... browser:purge-domain-data sent after domain-specific history and other information have been purged.
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nsIFile
otherwise it returns false.
...otherwise it returns false.
...otherwise it returns false.
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nsIPrincipal
boolean equals(in nsiprincipal other); jsprincipals getjsprincipals(in jscontext cx); native code only!
... boolean subsumes(in nsiprincipal other); attributes attribute type description certificate nsisupports the certificate associated with this principal, if any.
...note: other policies might override this, such as the access-control specification.
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Reference Manual
reference-counting safeguards all of the operations that extract the underlying raw pointer out of an nscomptr use a c trick to implement another safety feature.
...such a cast can easily by-pass nscomptrs machinery, causing leaks, type mismatches, and other calamities.
...this implies that the entire application must be compiled with the same setting of nscap_feature_debug_ptr_types, else some parts will be expecting a base class and others will not.
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Timing element visibility with the Intersection Observer API - Web APIs
it turns out that one of the most common uses of flash or other script in advertising on the web is to record how long each ad is visible, for the purpose of billing and payment of revenues.
... without the intersection observer api, this winds up being done using intervals and timeouts for each individual ad, or other techniques that tend to slow the page down.
...we'll be using css grid to style and lay out the site, so we can be pretty straightforward here: <div class="wrapper"> <header> <h1>a fake blog</h1> <h2>showing intersection observer in action!</h2> </header> <aside> <nav> <ul> <li><a href="#link1">a link</a></li> <li><a href="#link2">another link</a></li> <li><a href="#link3">one more link</a></li> </ul> </nav> </aside> <main> </main> </div> this is the framework for the entire site.
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RTCPeerConnection - Web APIs
if sctp hasn't been negotiated, this value is null.signalingstate read only the read-only signalingstate property on the rtcpeerconnection interface returns one of the string values specified by the rtcsignalingstate enum; these values describe the state of the signaling process on the local end of the connection while connecting or reconnecting to another peer.
...this happens whenever the local ice agent needs to deliver a message to the other peer through the signaling server.oniceconnectionstatechange the rtcpeerconnection.oniceconnectionstatechange property is an event handler which specifies a function to be called when the iceconnectionstatechange event is fired on an rtcpeerconnection instance.
...instead of using this obsolete method, you should instead use addtrack() once for each track you wish to send to the remote peer.addtrack()the rtcpeerconnection method addtrack() adds a new media track to the set of tracks which will be transmitted to the other peer.close() the rtcpeerconnection.close() method closes the current peer connection.createanswer() the createanswer() method on the rtcpeerconnection interface creates an sdp answer to an offer received from a remote peer during the offer/answer negotiation of a webrtc connection.
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Spaces and reference spaces: Spatial tracking in WebXR - Web APIs
other hardware elements can be used similarly to represent other parts of the body, providing additional data to use when simulating the user's actions in their environment.
... representing a position using a reference space as covered in defining spatial relationships with reference spaces in geometry and reference spaces in webxr, reference spaces establish a local coordinate system which is offset from another coordinate system that is itself defined by some other space.
... the target ray; each controller or other handheld device may have a targeting ray associated with it, which is represented by a space whose origin is at the point on the controller at which the ray is emitted, and is oriented so that -z extends in the direction of the target it's pointing at.
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Basic concepts of flexbox - CSS: Cascading Style Sheets
understanding which axis is which is important when we start to look at aligning and justifying flex items; flexbox features properties that align and justify content along one axis or the other.
... start and end lines another vital area of understanding is how flexbox makes no assumption about the writing mode of the document.
...modern layout methods encompass the range of writing modes and so we no longer assume that a line of text will start at the top left of a document and run towards the right hand side, with new lines appearing one under the other.
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Auto-placement in CSS Grid Layout - CSS: Cascading Style Sheets
some of the items may have a position on the grid, but others may be auto-placed.
...otherwise they will stay by default in the order that they are entered in the document source.
...you can see how those items are placed and the other items then auto-place in the spaces.
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background-position - CSS: Cascading Style Sheets
the other dimension is then set to 50%, so the item is placed in the middle of the edge specified.
... 2-value syntax: one value defines x and the other defines y.
...if left or right are given here, then this defines x and the other given value defines y.
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Creating a cross-browser video player - Developer guides
note: ie9 behaves differently than most other browsers when a poster attribute is set.
...ie9 will only use the specified poster image in this way if preload="none" is set; otherwise, it will take the first still of the video and display that instead.
...in addition, the fullscreen button will use the fullscreen api, another w3c api that controls the ability of web browsers to show apps using your computer's full screen.
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Applying color to HTML elements using CSS - HTML: Hypertext Markup Language
among the options for the shadow is the shadow's base color (which is then blurred and blended with the background based on the other parameters).
...this outline is different from the border in that it doesn't get space set aside for it in the document (so it may overlap other content).
... other ways to use color css isn't the only web technology that supports color.
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HTML attribute: rel - HTML: Hypertext Markup Language
not allowed annotation annotation opener creates an auxiliary browsing context if the hyperlink would otherwise create a top-level browsing context that is not anauxiliary browsing context (i.e., has "_blank" as target attribute value).
...if the attribute is omitted or if none of the values in the attribute are supported, then the document has no particular relationship with the destination resource other than there being a hyperlink between the two.
... note: apple's ios does not use this link type, nor the sizes attribute, like others mobile browsers do, to select a webpage icon for web clip or a start-up placeholder.
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<input type="checkbox"> - HTML: Hypertext Markup Language
(only the htmlinputelement’s checked idl attribute is updated.) note: unlike other input controls, a checkboxes value is only included in the submitted data if the checkbox is currently checked.
... unlike other browsers, firefox by default persists the dynamic checked state of an <input> across page loads.
...this may happen, for instance, if the state of the checkbox depends on multiple other checkboxes, and those checkboxes have different values.
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HTML: Hypertext Markup Language
other technologies besides html are generally used to describe a web page's appearance/presentation (css) or functionality/behavior (javascript).
... "hypertext" refers to links that connect web pages to one another, either within a single website or between websites.
...by uploading content to the internet and linking it to pages created by other people, you become an active participant in the world wide web.
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MIME types (IANA media types) - HTTP
each type has its own set of possible subtypes, and a mime type always has both a type and a subtype, never just one or the other.
... discrete types the discrete types currently registered with the iana are: applicationlist at iana any kind of binary data that doesn't fall explicitly into one of the other types; either data that will be executed or interpreted in some way or binary data that requires a specific application or category of application to use.
...other common examples include application/pdf, application/pkcs8, and application/zip.
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Details of the object model - JavaScript
an instance, on the other hand, is the instantiation of a class; that is.
...in addition, any object can be associated as the prototype for another object, allowing the second object to share the first object's properties.
...a constructor method can specify initial values for the instance's properties and perform other processing appropriate at creation time.
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Populating the page: how browsers work - Web Performance
it occurs whenever a user requests a page by entering a url into the address bar, clicking a link, submitting a form, as well as other actions.
... tls negotiation for secure connections established over https, another "handshake" is required.
... <!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.
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The building blocks of responsive design - Progressive web apps (PWAs)
other articles will discuss the functionality in more detail, but here we're interested in the layout.
...when you click on an image in the gallery it brings up options to delete or cancel deletion of the card, and you don't want two buttons on top of one another.
... font-size: 6.8vw; -webkit-flex: 1; -moz-flex: 1; -ms-flex: 1; flex: 1; border-left: 1px solid rgba(100,100,100,0.4); } nav button:first-child { border-left: 0; } } in this last set of rules, we change the display value of the <nav> to flex to make it show (it was set to none in the default css at the top of the stylesheet, as it wasn't needed for the other views.) we then use absolute positioning and z-index to make it take up no space in the document flow, and sit on top of the x-cards (this is why we gave the x-cards that top-margin earlier).
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Paths - SVG: Scalable Vector Graphics
later, we will learn how paths can be transformed to suit other needs.
...there is no real performance penalty or bonus for using one or the other.
...the other two are control points.
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Modules - Archive of obsolete content
like any other custom loader, cuddlefish is created using the loader constructor.
...unfortunately, javascript does not provide any means to load scripts from other locations: we have to rely on the host application to provide us with this functionality.
...however, the following example shows how it can be used to load scripts from other locations: const { classes: cc interfaces: ci } = components; var instance = cc["@mozilla.org/moz/jssubscript-loader;1"]; var loader = instance.getservice(ci.mozijssubscriptloader); function loadscript(url) { loader.loadsubscript(url); } when a script is loaded, it is evaluated in the scope of the global object of the script that loaded it.
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Extension Etiquette - Archive of obsolete content
ideally, the location would be below the add-ons item, grouped with the other extension-related commands (menuitem:insertafter="javascriptconsole,devtoolsseparator").
... other ui elements in general, toolbar items are very useful to end users because they can be removed or added to various toolbars as necessary.
...they allow for easy identification among other extensions in the extensions manager.
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XPCOM Objects - Archive of obsolete content
we often mention other "mozilla based applications".
... another useful resource is this xpcom reference.
... passing parameters passing parameters to xpcom methods is no different from other js objects, with some exceptions.
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Creating regular expressions for a microsummary generator - Archive of obsolete content
a sequence of characters) that matches patterns of characters in other strings.
... urls 101 urls for auction item pages on ebay, like those on many other sites, usually start with the string "http://" and contain a domain name, a file path, and some query parameters.
... matching from the start of the url while this expression matches the url, it also matches other urls that contain this url in their query parameters, for example: http://www.example.com/redirect.php?url=http://cgi.ebay.com/ws/ebayisapi.dll?viewitem&item=280018439106 that's probably not what we want, since urls that contain our example url probably aren't auction item pages themselves.
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Creating XPI Installer Modules - Archive of obsolete content
mozilla has introduced major changes to the way that themes and all the other parts of the ui are packaged.
...where before a single manifest.rdf file described the resources in an entire package directory or archive, now contents.rdf files can be used for as large or as small a part of your package description as you want; you can use several contents.rdf files in your package to describe the various parts (e.g., one for the skin of your package, another for the content, and so on), or you can use a single one, as was common before.
...one way of another, the chrome registry is shown the contents.rdf files; the contents.rdf files in turn point to new resources, and the resources are then registered with mozilla and accessible to the user.
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Introduction to XUL - Archive of obsolete content
though the former term seems more concrete than the other, and therefore is not an exact replacement, no one is completely certain why we have both.
...relative placement of widgets, their interactions with each other, and optionally some of their configuration, will be controlled by a ui layout specified in a script whose structure is defined in this and related documents.
... most of the details of writing a xul document are identical to those for writing an xml document, a description of which we will leave to other excellent xml documentation which we assume must exist but have never seen.
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Template Logging - Archive of obsolete content
if other flags are used as well, separate them with spaces.
...for other datasources, this may be a somewhat random value.
...in other words, the generated content will only change when active results are involved.
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Introduction - Archive of obsolete content
xul has all the advantages of other xml languages.
... for example xhtml or other xml languages such as mathml or svg can be inserted within it.
... also, text displayed with xul is easily localizable, which means that it can be translated into other languages with little effort.
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Writing Skinnable XUL and CSS - Archive of obsolete content
if you wish for your package to blend in with the other packages, then the skin for your package should inherit information from the global skin in order to reduce the amount of duplication across packages and in order to make the ui as a whole easier to skin.
...css files that import another skin file are calledderived skin files.
... css files that don't import another skin file are calledbase skin files.
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Choosing Standards Compliance Over Proprietary Practices - Archive of obsolete content
sure, there are other reasons -– accountability, checkpoints, and scheduling, for example.
... other standards it is also important to follow other types of standards across an organization.
...in other words, there must be long-term potential.
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Mobile accessibility - Learn web development
press the voiceover slider to enable it (you'll also see a number of other options related to voiceover on this page).
... note: for a more complete reference covering the voiceover gestures available and other hints on accessibility testing on ios, see test accessibility on your device with voiceover.
...to recap, these cause accessibility issues because other control mechanisms can't activate the associated functionality.
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Legacy layout methods - Learn web development
previous overview: css layout next grid systems are a very common feature used in css layouts, and before css grid layout they tended to be implemented using floats or other layout features.
... for new projects, in most cases css grid layout will be used in combination with one or more other modern layout methods to form the basis for any layout.
...if we want the two <div>s to be floated alongside one another, we need to set their widths to total 100% of the width of their parent element or smaller so they can fit alongside one another.
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Practical positioning examples - Learn web development
the idea here is that we will style the tabs to look like a standard horizontal navigation menu, and style the panels to sit on top of one another using absolute positioning.
...first, add the following rule at the bottom of your css to remove the default padding-left and margin-top from the unordered list: .info-box ul { padding-left: 0; margin-top: 0; } note: we are using descendant selectors with .info-box at the start of the chain throughout this example — this is so that we can insert this feature into a page with other content already on it, without fear of interfering with the styles applied to other parts of the page.
...the <a> elements are set to display inline-block so they will sit in a line but still be stylable, and they are styled appropriately for tab buttons, using a variety of other properties.
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Images in HTML - Learn web development
fortunately, it wasn't too long before the ability to embed images (and other more interesting types of content) inside web pages was added.
... there are other types of multimedia to consider, but it is logical to start with the humble <img> element, used to embed a simple image in a webpage.
...in other words, what you lose if your image doesn't show up: decoration.
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Fetching data from the server - Learn web development
previous overview: client-side web apis next another very common task in modern websites and applications is retrieving individual data items from the server to update sections of a webpage without having to load an entire new page.
...this isn't strictly necessary here — xhr returns text by default — but it is a good idea to get into the habit of setting this in case you want to fetch other types of data in the future.
... add this next: request.responsetype = 'text'; fetching a resource from the network is an asynchronous operation, meaning that you have to wait for that operation to complete (e.g., the resource is returned from the network) before you can do anything with that response, otherwise, an error will be thrown.
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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.
... in the same way, if you want to say, program some 3d graphics, it is a lot easier to do it using an api written in a higher-level language such as javascript or python, rather than try to directly write low level code (say c or c++) that directly controls the computer's gpu or other graphics functions.
... relationship between javascript, apis, and other javascript tools so above, we talked about what client-side javascript apis are, and how they relate to the javascript language.
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Inheritance in JavaScript - Learn web development
how do we create an object in javascript that inherits from another object?
...later you'll see how these can be inherited by other constructors.
...the first parameter specifies the value of this that you want to use when running the function, and the other parameters are those that should be passed to the function when it is invoked.
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Aprender y obtener ayuda - Learn web development
there are also several other great resources on the web, some of which we'll mention below.
... note: you might favor one learning method over the others, but realistically a hybrid approach is probably what you will end up with.
... and you'll probably come up with other methods than the three we covered above.
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Software accessibility: Where are we today?
select text, pictures, and other information using a mouse react to sounds played.
... physically disabled: users have amputations, paralysis, repetitive stress, cerebral palsy, muscular dystrophy, parkinson's or other problems limiting mobility.
...talking programs are also useful for print disabilities other than visual impairments, such as dyslexia.
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Eclipse CDT
to tab to another view, use cmd-f7/ctrl-f7.
...this will open another tab containing the same file.
...changes you make in one editor will be immediately reflected in the other.
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Storage access policy: Block cookies from trackers
firefox includes a new storage access policy that blocks cookies and other site data from third-party tracking resources.
...the cookie policy can be enabled in other versions of firefox through the content blocking settings (these steps will vary by version; the linked documentation includes a dropdown to select the appropriate firefox version).
... the storage access policy blocks resources identified as trackers from accessing their cookies and other site storage when they are loaded in a third-party context.
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OS.File for the main thread
for other uses of os.file, please see the corresponding page.
...tory: let promise = os.file.stat(somepath); promise = promise.then( function onsuccess(stat) { if (stat.isdir) { // the path represents a directory } else { // the path represents a file, not a directory } }, function onfailure(reason) { if (reason instanceof os.file.error && reason.becausenosuchfile) { // the file does not exist } else { // some other error throw reason; } } ); example: copy a file by chunks the following snippet writes a (presumably large) buffer by chunks.
...depending on other fields, it may also be opened for writing.
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Mozilla DOM Hacking Guide
otherwise, for more detailed xpcom documentation, please see the xpcom project page.
...other browsers allow the history object to be used like an array, e.g.
...we can see that the nseventrecieversh helper class inherits from nsdomgenericsh: class nseventrecieversh : public nsdomgenericsh and nsdomgenericsh is typedef'ed to nsdomclassinfo: typedef nsdomclassinfo nsdomgenericsh; another example is nswindowsh, which inherits from nseventreceiversh, thus inheriting from nsdomclassinfo.
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Memory reporting
this is important because sometimes an object might be embedded in another object that is measured separately.
...the amallocsizeof parameter allows mozilla::mallocsizeof functions with dmd-specific hooks to be passed in when they are used by memory reporters, but functions without such hooks (such as moz_malloc_size_of) can also be passed in when they are used in other circumstances.
... some other things to note.
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Power profiling overview
the other states have higher numbers and reflect increasing deeper idle states.
... the other thing to note about c-states is that they apply both to cores and the entire package — i.e.
... one consequence of the existence of c-states is that observations made during power profiling — even more than with other kinds of profiling — can disturb what is being observed.
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SpiderMonkey Build Documentation
before you begin, make sure you have the right build tools for your computer: linux, windows, mac, others.
... this can help debug memory leaks and other memory-related problems.
... for a list of other available build options, type (assuming the current working directory is one of the above-created build directories): /bin/sh ../configure.in --help generating a compilation database some tools (like ides, static analyzers and refactoring tools) consume a file called compile_commands.json which contains a description of all the pieces required to build a piece of software so that tools don't have to also understand a build system.
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Introduction to XPCOM for the DOM
xpcom provides a handy method to get a pointer to an interface when you have a pointer to another interface, and both interfaces are implemented by the same object.
...if you have to assign it another address later, you can easily do ifooptr2 = do_queryinterface(another_pointer); this syntax however is just a convenient shortcut to the real function.
... the next section is a tutorial on how to add a new interface to the mozilla dom, with build instructions et al, and the last section is a discussion of the more advanced topics of object-oriented c++ , interface inheritance, and other fun stuff.
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mozIRegistry
this issue needs to be resolved in order to enable alternative moziregistry implementations or to permit other service implementations to be bound at runtime.
...worst case, clients would obtain the moziregistry singleton via some other means (i.e., a "nsgetregistry" function).
... architecture this diagram illustrates the various components that you will be using to interoperate with other mozilla components.
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DOM Inspector internals - Firefox Developer Tools
besides the dom inspector's primary ui, there are a couple other top-level inspectors which differ slightly (the object inspector and dom inspector sidebar used in seamonkey).
... initially, we will begin by focusing on inspector.xul and its entry point, and then expand our focus later to explain how these other inspectors differ.
...one panel reacts to changes to the inspected document, and the other panel reacts to changes to the selection in the first panel.
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Applying styles and colors - Web APIs
the globalalpha property can be useful if you want to draw a lot of shapes on the canvas with similar transparency, but otherwise it's generally more useful to set the transparency on individual shapes when setting their colors.
...by overlaying ever more circles on top of each other, we effectively reduce the transparency of the circles that have already been drawn.
...0.2; // draw semi transparent circles for (var i = 0; i < 7; i++) { ctx.beginpath(); ctx.arc(75, 75, 10 + 10 * i, 0, math.pi * 2, true); ctx.fill(); } } <canvas id="canvas" width="150" height="150"></canvas> draw(); screenshotlive sample an example using rgba() in this second example, we do something similar to the one above, but instead of drawing circles on top of each other, i've drawn small rectangles with increasing opacity.
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How whitespace is handled by HTML, CSS, and in the DOM - Web APIs
these characters allow you to format your code in a way that will make it easily readable by yourself and other people.
... let’s take another really simple example.
... another text node (consisting only of tabs and spaces).
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Basic concepts - Web APIs
big concepts if you have assumptions from working with other types of databases, you might get thrown off when working with indexeddb.
...without transactional operations, the two instances could interfere with each other's modifications.
...error events, on the other hand, do bubble, and can be cancelled.
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Lifetime of a WebRTC session - Web APIs
this page is currently under construction, and some of the content will move to other pages as the webrtc guide material is built out.
...but they realized that it would take longer to complete the transition than 32-bit addresses would last, so other smart people came up with a way to let multiple computers share the same 32-bit ip address.
... the problem for users is that each individual computer on the internet no longer necessarily has a unique ip address, and, in fact, each device’s ip address may change not only if they move from one network to another, but if their network’s address is changed by nat and/or dhcp.
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Using DTMF with WebRTC - Web APIs
webrtc currently ignores these payloads; this is because webrtc's dtmf support is primarily intended for use with legacy telephone services that rely on dtmf tones to perform tasks such as: teleconferencing systems menu systems voicemail systems entry of credit card or other payment information passcode entry note: while the dtmf is not sent to the remote peer as audio, browsers may choose to play the corresponding tone to the local user as part of their user experience, since users are typically used to hearing their phone play the tones audibly.
...when you wish to transmit dtmf signals, you first need to decide which track to send them on, since dtmf is sent as a series of out-of-band payloads on the rtcrtpsender responsible for transmitting that track's data to the other peer.
...from there, you can simply call rtcdtmfsender.insertdtmf() to enqueue dtmf signals to be sent on the track to the other peer.
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Web accessibility for seizures and physical reactions - Accessibility
this article introduces concepts behind making web content accessibile for those with vestibular disorders, and how to measure and prevent content leading to seizures and / or other physical reactions.
...web technologies that use video, animated gifs, animated pngs, animated svgs, canvas, and css or javascript animations are all capable of content that can induce seizures or other incapacitating physical reactions.
...in the case of photosensitive epilepsy, seizures are triggered specifically by flashing lights, but other types of reflex epilepsies may be triggered by the act of reading, or by noises.
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Using CSS animations - CSS: Cascading Style Sheets
css animations make it possible to animate transitions from one css style configuration to another.
...the rendering engine can use frame-skipping and other techniques to keep the performance as smooth as possible.
...this lets you configure the timing, duration, and other details of how the animation sequence should progress.
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<input type="datetime-local"> - HTML: Hypertext Markup Language
in other browsers, these degrade gracefully to simple <input type="text"> controls.
...in other words, an implementation should allow any valid combination of year, month, day, hour, and minute - even if such a combination is invalid in the user's local time zone (such as times within a daylight saving time spring-forward transition gap).
...another option is to use separate date and time inputs, each of which is more widely supported than datetime-local.
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<input type="time"> - HTML: Hypertext Markup Language
support is good in modern browsers, with safari being the sole major browser not yet implementing it; in safari, and any other browsers that don't support <time>, it degrades gracefully to <input type="text">.
...only values which are equal to the basis for stepping (min if specified, value otherwise, and an appropriate default value if neither of those is provided) are valid.
... a string value of any means that no stepping is implied, and any value is allowed (barring other constraints, such as min and max).
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HTTP caching - HTTP
on the other side, it has to be configured properly as not all resources stay identical forever: it is important to cache a resource only until it changes, not longer.
...however, common http caches are typically limited to caching responses to get and may decline other methods.
... responses other than get if something suitable for use as a cache key is defined.
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Concurrency model and the event loop - JavaScript
this model is quite different from models in other languages like c and java.
... "run-to-completion" each message is processed completely before any other message is processed.
... this offers some nice properties when reasoning about your program, including the fact that whenever a function runs, it cannot be pre-empted and will run entirely before any other code runs (and can modify data the function manipulates).
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Functions - JavaScript
1 : n * fac(n - 1) } console.log(factorial(3)) function expressions are convenient when passing a function as an argument to another function.
...rial(n) { if ((n === 0) || (n === 1)) return 1; else return (n * factorial(n - 1)); } you could then compute the factorials of 1 through 5 as follows: var a, b, c, d, e; a = factorial(1); // a gets the value 1 b = factorial(2); // b gets the value 2 c = factorial(3); // c gets the value 6 d = factorial(4); // d gets the value 24 e = factorial(5); // e gets the value 120 there are other ways to call functions.
... in other words, a function defined in the global scope can access all variables defined in the global scope.
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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).
... aside — .mjs versus .js throughout this article, we've used .js extensions for our module files, but in other resources you may see the .mjs extension used instead.
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Types of attacks - Web security
that is other than what the user thinks it is.
...the user's browser cannot detect the malicious script is untrustworthy, and so gives it access to any cookies, session tokens, or other sensitive site-specific information, or lets the malicious script rewrite the html content.
... the malicious content often includes javascript, but sometimes html, flash, or any other code the browser can execute.
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Index - XSLT: Extensible Stylesheet Language Transformations
an instruction, on the other hand, is associated with a template.
...the element must be defined before any other output document element inside the output document element for which it establishes attribute values.
...otherwise, nodes are processed in document order.
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Preferences - Archive of obsolete content
information here applies to the mozilla suite, firefox, thunderbird, and possibly other mozilla-based applications.
... if you haven't yet, read other documents about mozilla preferences on mdn (links below in resources section).
...ii.value", components.interfaces.nsisupportsstring).data; // example 2: setting unicode value var str = components.classes["@mozilla.org/supports-string;1"] .createinstance(components.interfaces.nsisupportsstring); str.data = "some non-ascii text"; prefs.setcomplexvalue("preference.with.non.ascii.value", components.interfaces.nsisupportsstring, str); nsipreflocalizedstring another complex type supported by mozilla is nsipreflocalizedstring.
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Adding Toolbars and Toolbar Buttons - Archive of obsolete content
it's a comma-separated list of ids, and it can also include other special values: spacer, separator and spring.
...the other types, checkbox and radio are useful when you have buttons that change state when the user clicks on them.
... you can have a different skin directory for each operating system using manifest flags in the chrome.manifest file: skin xulschoolhello classic/1.0 skin/unix/ skin xulschoolhello classic/1.0 skin/win/ os=winnt skin xulschoolhello classic/1.0 skin/mac/ os=darwin the osversion flag can be used in case we wanted to have different icons for mac os x lion and above, and others for older systems.
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Adding sidebars - Archive of obsolete content
to sum up both of these references: you can choose an obscure key combination that won't conflict with firefox, such as ctrl+shift+(some letter), but there's no way of knowing if any other extension uses that same combination as well.
... the xul page for the sidebar can hold any content you want and it's no different from other xul windows or overlays.
... another, more important difference to take into account is that users can resize the sidebar to their liking, and in most cases, the sidebar is going to be fairly narrow.
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New Security Model for Web Services - Archive of obsolete content
client-controlled solutions several client-controlled solutions have been designed to prevent sandboxed applications loaded behind a firewall from compromising other resources protected behind the firewall.
... same source restriction by restricting sandboxed scripts to access only resources in the domain from which they were loaded, any script loaded from one domain into another is prevented from accessing resources in the domain into which it has been loaded.
...a white list is a good tool for including always-trusted domains, but on the web, it is often a script from a relatively-untrusted domain that must be granted access to other untrusted domains, without compromising internal domains.
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Venkman Introduction - Archive of obsolete content
on windows, the javascript debugger compares favorably with visual interdev and other large web development tools.
... on other platforms, including mac os and unix, it is alone in offering this degree of flexibility, depth, and power in a visual debugging environment.
... starting the debugger the javascript debugger is automatically pre-installed in mozilla 1.x but must be installed separately in firefox and other gecko-based products, such as thunderbird and netscape 7.x.
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XML in Mozilla - Archive of obsolete content
several world wide web consortium (w3c) recommendations and drafts from the xml family of specifications are supported, as well as other related technologies.
...dtds and other external entities mozilla does not load external entities from the web.
...another exception is an entity whose system identifier is a relative path, and the xml declaration states that the document is not standalone (default), in which case mozilla will try to look for the entity under <bin>/res/dtd directory.
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Stacks and Decks - Archive of obsolete content
containers each xul box is a container that can contain any other element.
... in fact, many components can contain other elements.
... we've already seen that buttons may contain other things besides the default.
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Using Spacers - Archive of obsolete content
some users may have larger displays with higher resolutions and others may have lower resolutions.
...if adding support for multiple languages, the text for one language may require more room than another.
...before we get into detail about boxes, we'll introduce another xul element that is useful for layout, the spacer.
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XUL Event Propagation - Archive of obsolete content
the following image describes in a very basic way how the various actors in the event model interact with one another.
...this button responds to the user action by raising an event, a message meant to travel from one element within the interface to another.
...any element that is interested in the event -- any part of the interface, in other words, that needs to know about and respond to the user's click action on the button -- "handles" the event with an event handler, or chunk of code to be executed when the given event is "heard".
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textbox - Archive of obsolete content
as of gecko 13.0 (firefox 13.0 / thunderbird 13.0 / seamonkey 2.10), the script code only runs in the context of the <textbox> element, matching the behavior of all other event handlers.
...the event is not sent until the focus is moved to another element.
...as of gecko 13.0 (firefox 13.0 / thunderbird 13.0 / seamonkey 2.10), the script code only runs in the context of the <textbox> element, matching the behavior of all other event handlers.
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Back to the Server: Server-Side JavaScript On The Rise - Archive of obsolete content
in recent developments we also see the advent of other performant engines for javascript such as v8 from google and squirrelfish for webkit, these engines are raising the bar on performance and help to maintain a competitive environment that will hopefully direct competitive focus on the performance aspect of all the major javascript implementations.
...spidermonkey on the other hand is the javascript engine (written in c) in the highly popular mozilla firefox browser.
...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.
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Reference - Archive of obsolete content
well if you combine the two, you can have inherited private variables: function myclass(){ var property = 5; this.tellme = function(){ return property; } } function myotherclass(){ myclass.apply( this ); } var o = new myotherclass; alert( o.tellme() ); //alerts 5 as you'd expect — the preceding comment was added by psygnisfive (talk – contribs) on 22:23, 4 december 2006 terminology we need a terminology appendix.
... otherwise, i think we should just remove the "behavior in other versions" sections, and rename the "javascript 1.2" section headings to something like "differences with javascript 1.2," as well as include a link to the yet-to-be-written javascript 1.2 page documenting the various oddities and deviations made in that version, something which i think we should do anyway.
...others just capitalize the first word.
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Game distribution - Game development
an html5 game is just another website.
... if you want to make money out of game dev, you should secure your source code one way or another against people who could easily take it and sell it as their own.
...another good measure to take is to provide an online demo if you're planning on packaging it and selling it in a closed store like itunes or steam.
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What is accessibility? - Learn web development
we traditionally think of this as being about people with disabilities, but the practice of making sites accessible also benefits other groups such as those using mobile devices, or those with slow network connections.
...providing accessible sites is part of the law in some countries, which can open up some significant markets that otherwise would not be able to use your services or buy your products.
... other good practices that improve accessibility also make your site more usable by other groups, such as mobile phone users or those on low network speed.
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Images, media, and form elements - Learn web development
images, other media, and form elements behave a little differently in terms of your ability to style them with css than regular boxes.
...this means that css cannot affect the internal layout of these elements — only their position on the page amongst other elements.
... the other is larger than 200 pixels and overflows the box.
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How CSS is structured - Learn web development
a class is rated as being more specific, as in having more specificity than the element selector, so it cancels the other conflicting style declaration.
... important: in css (and other web standards), it has been agreed that us spelling is the standard where there is language variation or uncertainty.
... another example would be the various values for transform, such as rotate().
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Basic native form controls - Learn web development
note: html5 enhanced the basic original single line text field by adding special values for the type attribute that enforce specific validation constraints and other features, for example specific to entering urls or numbers.
...with dots or asterisks) so it can't be easily read by others.
... hidden content another original text control is the hidden input type.
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The HTML5 input types - Learn web development
any other content causes the browser to display an error when the form is submitted.
... this is another good reason for using these newer input types — improving the user experience for users of these devices.
... client-side validation as you can see above, email, along with other newer input types, provides built-in client-side error validation — performed by the browser before the data gets sent to the server.
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Functions — reusable blocks of code - Learn web development
previous overview: building blocks next another essential concept in coding is functions, which allow you to store a piece of code that does a single task inside a defined block, and then call that code whenever you need it using a single short command — rather than having to type out the same code multiple times.
...and functions can contain whatever code you like — you can even call other functions from inside functions.
... you can also assign an anonymous function to be the value of a variable, for example: const mygreeting = function() { alert('hello'); } this function could now be invoked using: mygreeting(); this effectively gives the function a name; you can also assign the function to be the value of multiple variables, for example: let anothergreeting = mygreeting; this function could now be invoked using either of: mygreeting(); anothergreeting(); but this would just be confusing, so don't do it!
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A first splash into JavaScript - Learn web development
you won't be expected to understand all of the code in detail immediately — we just want to introduce you to the high-level concepts for now, and give you an idea of how javascript (and other programming languages) work.
... note: many of the code features you'll see in javascript are the same as in other programming languages — functions, loops, etc.
... allow them to enter another guess.
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Basic math in JavaScript — numbers and operators - Learn web development
previous overview: first steps next at this point in the course we discuss math in javascript — how we can use operators and other features to successfully manipulate numbers to do our bidding.
...this is especially true when we are learning to program javascript (or any other language for that matter) — so much of what we do relies on processing numerical data, calculating new values, and so on, that you won't be surprised to learn that javascript has a full-featured set of math functions available.
...for a start, we are just going to stick to decimal numbers throughout this course; you'll rarely come across a need to start thinking about other types, if ever.
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JavaScript object basics - Learn web development
next you write a dot, then the item you want to access — this can be the name of a simple property, an item of an array property, or a call to one of the object's methods, for example: person.age person.interests[1] person.bio() sub-namespaces it is even possible to make the value of an object member another object.
...this sounds complex, but really it's not — to access these items you just need to chain the extra step onto the end with another dot.
... try these in the js console: person.name.first person.name.last important: at this point you'll also need to go through your method code and change any instances of name[0] name[1] to name.first name.last otherwise your methods will no longer work.
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Object prototypes - Learn web development
previous overview: objects next prototypes are the mechanism by which javascript objects inherit features from one another.
...this is often referred to as a prototype chain, and explains why different objects have properties and methods defined on other objects available to them.
...you will however also see some other members — tostring, valueof, etc — these are defined on person1's prototype object's prototype object, which is object.prototype.
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Introducing a complete toolchain - Learn web development
javascript) or another language entirely (e.g.
...git is currently the most popular source code revision control tool available to developers — revision control provides many advantages, such as a way to backup your work in a remote place, and a mechanism to work in a team on the same project without fear of overwriting each other's code.
... as with other tools, code editor integration support is typically good for eslint, and potentially more useful as it can give us real-time feedback when issues crop up: configuring the initial project using these tools, a new project can be set up safe in the knowledge that many "basic" issues will be caught early on.
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Mozilla accessibility architecture
the situation for other accessibility apis is similar.
...common implementations shared by html and xul implementations accessible/src/html/ document and html object implementations accessible/src/xul/ user interface and xul object implementations accessible/src/msaa/ windows implementations accessible/src/atk/ atk implementations, may eventually be used on platforms other than linux and unix accessible/src/mac/ empty implementations of platform-specific classes for os x.
... accessible/src/other/ empty implementations of platform-specific classes so that builds don't fail on platforms currently not-supported where we put toolkit-specific code because atk and msaa are different accessibility api toolkits which share only about 75% of their code, there is a lot of toolkit-specific code that needs to live somewhere.
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Adding a new CSS property
if you need more details on any of the points mentioned here, a good place to find them is by looking at other changes in the version control history of the files mentioned.
... see the documentation at the top of the file and the other entries for examples.
... again, see the documentation at the top of the file and the other entries for examples, and also see the next section for details about parsing.
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Experimental features in Firefox
nightly 53 yes developer edition 53 no beta 53 no release 53 no preference name dom.dialog_element.enabled global attribute: inputmode our implementation of the inputmode global attribute has been updated as per the whatwg spec (bug 1509527), but we still need to make other changes too, like making it available on contenteditable content.
... nightly 78 yes developer edition 78 yes beta 78 yes release 78 no preference name network.preload css display stray control characters in css as hex boxes this feature renders control characters (unicode category cc) other than tab (u+0009), line feed (u+000a), form feed (u+000c), and carriage return (u+000d) as a hexbox when they are not expected.
...when tabbing between elements), and not when they are focused using a mouse or other pointing device.
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Multiple Firefox profiles
a profile in firefox is the collection of settings, customizations, add-ons, and other personalizations that a user has made or installed into their copy of firefox.
... web developers might want a secondary profile for testing websites, apps, or other projects on different firefox channels.
...you can remove such add-ons from your profile for nightly use while keeping them for use with other profiles.
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Localization Use Cases
eappfreespace() { var self = this; this.getfreespace(this.appstorage, function(freespace) { devicestoragehelper.showformatedsize(self.appstoragedesc, 'availablesize', freespace); }); }, problem definition for all values of freespace, the following string is enough to construct a grammatically-correct sentence in english: availablesize = {{$size}} {{$unit}} available however, other languages might need to pluralize this string with different forms of the available adjective.
... consequently, using the existing localization frameworks, the developer needs to predict which strings might need pluralization in other languages, and pluralize them even in english: availablesize = {[ plural(size) ]} availablesize[other] = {{$size}} {{$unit}} available an italian translation might look like this: availablesize = {[ plural(size) ]} availablesize[one] = {{$size}} {{$unit}} disponibile availablesize[other] = {{$size}} {{$unit}} disponibili it's easy to imagine how developers might forget to pluralize some strings that in other languages might require pluralization (or other grammatical features that the framework supports).
... solution l20n isolates each language so that grammatical requirements of one don't affect others.
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An overview of NSS Internals
it's free and open source software, and many other software projects have decided to use it.
...(note that it's important to look at the number 11, as there are other pkcs standards with different numbers that define quite different topics.) a software or hardware module conforming to the pkcs#11 standard implements an interface of c calls, which allow querying the characteristics and offered services of the module.
...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.
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Invariants
there may be other reasons that cover more cases, but nobody can remember one.) all jsobjects and heap-allocated jsstrings must be 8-byte-aligned.
...even if the function is native, there is serious trouble: js_newobject with null parent argument calculates the parent from cx->fp->scopechain, which can be stale if we're on trace.) the chain of properties starting at any jsshape and chasing jsshape::parent never forms a cycle and does not contain any duplicate jsscopeproperty::slot values other than -1.
...(we don't bother locking when accessing slots of a sealed object.
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JIT Optimization Strategies
with uniquely-typed objects, it is guaranteed that no other object has that same type.
...this strategy is used when all the others fail.
... inline caches are an order of magnitude slower than the other optimization strategies, and are an indication that the type inference engine has failed to collect enough information to guide the optimization process.
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IAccessibleTable
other-licenses/ia2/accessibletable.idlnot scriptable this interface gives access to a two-dimensional table.
...otherwise a null pointer is returned.
...isselected returns true if the specified column is selected completely and false otherwise.
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Introduction to DOM Inspector - Firefox Developer Tools
if the dom inspector doesn't automatically load a document or loads a document other than the one you'd like to inspect, you can select the desired document a few different ways.
...it's possible to use other viewers, but for now we'll stick to describing the dom nodes viewer and the dom node viewer.
...one common use of the dom inspector is to find the name and location of particular icon being used in the user interface, which is not an easy task otherwise.
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Index - Firefox Developer Tools
3 accessibility inspector accessibility, accessibility inspector, devtools, guide, tools the accessibility inspector provides a means to access important information exposed to assistive technologies on the current page via the accessibility tree, allowing you to check what's missing or otherwise needs attention.
... 17 debugger-api debugger, intermediate, intro, javascript, tools mozilla’s javascript engine, spidermonkey, provides a debugging interface named debugger which lets javascript code observe and manipulate the execution of other javascript code.
...however, debugger is quite general, and can be used to implement other kinds of tools like tracers, coverage analysis, patch-and-continue, and so on.
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Introduction to the File and Directory Entries API - Web APIs
the file and directory entries api interacts with other related apis.
...the synchronous api, on the other hand, allows for simpler programming model, but it must be used with webworkers.
... the file and directory entries api and other storage apis the file and directory entries api is an alternative to other storage apis like indexeddb, websql (which has been deprecated since november18, 2010), and appcache.
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Writing WebSocket servers - Web APIs
websocket servers are often separate and specialized servers (for load-balancing or other practical reasons), so you will often use a reverse proxy (such as a regular http server) to detect websocket handshakes, pre-process them, and send those clients to a real websocket server.
... warning: the server may listen on any port it chooses, but if it chooses any port other than 80 or 443, it may have problems with firewalls and/or proxies.
...the server must be careful to understand everything the client asks for, otherwise security issues can occur.
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Accessibility documentation index - Accessibility
it is used to provide a generic landmark for people to be able to navigate to easily when none of the other landmark roles are appropriate.
...it is usually set on related content items such as comments, forum posts, newspaper articles or other items grouped together on one page.
...a figure is generally considered to be one or more images, code snippets, or other content that puts across information in a different way to a regular flow of text.
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Aligning Items in a Flex Container - CSS: Cascading Style Sheets
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.
... try the other values and see how all of the items align against each other in the flex container.
...i have targeted the first item using a first-child selector and set that item to align-self: stretch; another item has been selected using its class of selected and given align-self: center.
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OpenType font features guide - CSS: Cascading Style Sheets
these include things like ligatures (special glyphs that combine characters like 'fi' or 'ffl'), kerning (adjustments to the spacing between specific letterform pairings), fractions, numeral styles, and a number of others.
... 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.
...in the latter case, these alterations are actually necessary to properly express the language, so they go beyond the more stylistic preference of most other opentype features.
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place-items - CSS: Cascading Style Sheets
in absolutely-positioned layouts, the keyword behaved like start on replaced absolutely-positioned boxes, and as stretch on all other absolutely-positioned boxes.
... start the item is packed flush to each other toward the start edge of the alignment container in the appropriate axis.
... end the item is packed flush to each other toward the end edge of the alignment container in the appropriate axis.
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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.
...ubmit button is pressed printing events event name fired when beforeprint the print dialog is opened afterprint the print dialog is closed text composition events event name fired when compositionstart the composition of a passage of text is prepared (similar to keydown for a keyboard input, but works with other inputs such as speech recognition).
... compositionstart compositionevent dom l3 the composition of a passage of text is prepared (similar to keydown for a keyboard input, but works with other inputs such as speech recognition).
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Using HTML sections and outlines - Developer guides
semantic sectioning elements are specifically designed to communicate structural meaning to browsers and other technologies interpreting the document on behalf of users, such as screen readers and voice assistants.
...by contrast, the <nav> sectioning element more clearly describes to browsers and other devices the content contained: links or other navigational structures to help users move through and understand where they are in a site's or page's content.
...you can have primary and secondary menus, but you cannot nest a <nav> element inside another <nav> element.
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itemprop - HTML: Hypertext Markup Language
when a string value is a url, it is expressed using the <a> element and its href attribute, the <img> element and its src attribute, or other elements that link to or embed external resources.
...items that are not part of others are called top-level microdata items.
...the first item has two properties, "name", set to "amanda", and "band", set to another item.
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Using HTTP cookies - HTTP
cookies are mainly used for three purposes: session management logins, shopping carts, game scores, or anything else the server should remember personalization user preferences, themes, and other settings tracking recording and analyzing user behavior cookies were once used for general client-side storage.
... to see stored cookies (and other storage that a web page can use), you can enable the storage inspector in developer tools and select cookies from the storage tree.
... a vulnerable application on a sub-domain can set a cookie with the domain attribute, which gives access to that cookie on all other subdomains.
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Proxy Auto-Configuration (PAC) file - HTTP
notes: the javascript function should always be saved to a file by itself but not be embedded in a html file or any other file.
...otherwise, they are assumed to be in the local timezone.
...otherwise, the local timezone is used.
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Expressions and operators - JavaScript
these operators work as they do in most other programming languages when used with floating point numbers (in particular, note that division by zero produces infinity).
... logical operators operator usage description logical and (&&) expr1 && expr2 returns expr1 if it can be converted to false; otherwise, returns expr2.
... thus, when used with boolean values, && returns true if both operands are true; otherwise, returns false.
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Indexed collections - JavaScript
it has a property for determining the array length and other properties for use with regular expressions.
... the bracket syntax is called an "array literal" or "array initializer." it's shorter than other forms of array creation, and so is generally preferred.
...otherwise, an array with a single element (the provided value) will be created.
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The "codecs" parameter in common media types - Web media technologies
all of these file types support a variety of codecs, and those codecs may have any number of profiles, levels, and other configuration factors.
...some media types only let you specify the names of the codecs to use, while others allow you to specify various constraints on those codecs as well.
...this value must be one of 8, 10, or 12; which values are valid varies depending on the profile and other properties.
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File I/O - Archive of obsolete content
look in the source for other strings available: xpcom/io/nsappdirectoryservicedefs.h, xpcom/io/nsdirectoryservicedefs.h.
... other such keys as the "profd" key are available; check the known locations.
...var file = url.queryinterface(components.interfaces.nsifileurl).file; // file is a nsifile to load from file://, http://, chrome://, resource:// and other urls directly, use xmlhttprequest or netutil.asyncfetch().
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Chapter 4: Using XPCOM—Implementing advanced processes - Archive of obsolete content
introduction javascript lacks functions for opening files and character-code conversion, among other things.
... note: if you're developing components in c++ or other compiled languages, be sure to include binaries for every platform.
...for other components, you can create as many instances as you need.
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Appendix C: Avoiding using eval in Add-ons - Archive of obsolete content
this article is aimed at presenting alternatives to common eval uses in add-ons and other javascript code.
...even if you trust the remote server; for example, because it is one you rent and administer yourself, there is a huge security risk, because of, but not limited to: you might discontinue your project or sell it, so that it is possible another person with malicious intentions takes over your domain.
... jsonp, which really is just another script tag containing generated, remotely retrieved code, is generally not secure.
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Custom XUL Elements with XBL - Archive of obsolete content
« previousnext » xml binding language (xbl, sometimes also called extensible bindings language) is a language for describing bindings that can be attached to elements in other documents.
...in this case we're adding the "persons" dynamically, so you'll have to look into the js file to see how xshelloperson elements are created and added to the dom just like any other.
...on the other hand, if your bindings are small and have a strong relationship with each other, it makes sense to keep them together.
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Security best practices in extensions - Archive of obsolete content
other items are recommendations.
... this is written from the perspective of a firefox extension, but most items apply to extensions for other mozilla-based applications such as thunderbird or seamonkey.
...files loaded using the file protocol can access files on the user's disk and other local devices.
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Tabbed browser - Archive of obsolete content
furthermore another meaning of 'browser' in this document and in some firefox source is "the tabbrowser element" in a firefox xul window.
...the code given is for a menuitem, but will work equally well for other xul elements.
... window.open(url); } } } reusing by other criteria sometimes you want to reuse a previously-opened tab regardless of which url/uri it displays.
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An Interview With Douglas Bowman of Wired News - Archive of obsolete content
this includes rules and guidelines applying to everything from headers, footers, page hierarchy, titles, typography, iconography, navigation, and others.
...a developer would tell me something wasn't possible, and i could prove otherwise every time.
... like other designers and html whizzes, i became a master at manipulating and troubleshooting tables, nesting them in intricate ways to produce any layout or effect that could be imagined.
...And 5 more matches

Menu - Archive of obsolete content
if the menu is a context menu, it is called as beforehide(menu, context) and otherwise as beforehide(menu).
...if the menu is a context menu, it is called as beforeshow(menu, context) and otherwise as beforeshow(menu).
... isshowing boolean true if the menu is currently visible and false otherwise.
...And 5 more matches

panel - Archive of obsolete content
on linux, the default value is top, otherwise, the default value is parent.
... if a panel has one or more text fields, this attribute should not be set, otherwise ime or on-screen keyboard popups will appear incorrectly.
... top the panel is shown in front of all other normal windows, including those of other applications.
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Encryption and Decryption - Archive of obsolete content
in most cases, two related functions are employed, one for encryption and the other for decryption.
...symmetric-key encryption also provides a degree of authentication, since information encrypted with one symmetric key cannot be decrypted with any other symmetric key.
... thus, as long as the symmetric key is kept secret by the two parties using it to encrypt communications, each party can be sure that it is communicating with the other as long as the decrypted messages continue to make sense.
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Parsing microformats in JavaScript - Archive of obsolete content
otherwise this is the microformat node.
...otherwise this is the microformat node.
...otherwise this is the microformat node.
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Common causes of memory leaks in extensions - Extensions
while bug 695480 should prevent most of these compartment leaks, add-ons still need to be aware of the practices that caused these leaks, as the fix causes many add-ons which would have otherwise caused a leak to instead throw errors when attempting to access nodes from documents which no longer exist.
... strict mode also excludes several other error-prone code patterns.
...another solution would be to use the setinterval()/settimeout() instances content windows provide, but there is a big drawback with this idea: if the user disables javascript globally or locally (such as by using an add-on like noscript), then using the content window functions won't work.
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Game monetization - Game development
how much you charge for your game depends on the market, quality of your game and a lot of other small factors.
... freemium games that feature iaps are often referred to a freemium — a freemium game can be acquired and played for free, but you can pay for extra (premium) features, virtual goods or other benefits.
...the worst cases were when you could use real money to pay for getting advantages over other players, or when they restricted access to the next stages of the game unless the players paid.
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Accessible multimedia - Learn web development
previous overview: accessibility next another category of content that can create accessibility problems is multimedia — video, audio, and image content need to be given proper textual alternatives so they can be understood by assistive technologies and their users.
... this article on the other hand looks at another general class of content that arguably isn't as easy to ensure accessibility for — multimedia.
... creating custom audio and video controls html5 video and audio share an api — html media element — which allows you to map custom functionality to buttons and other controls — both of which you define yourself.
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Advanced styling effects - Learn web development
other box shadow features unlike text-shadow, box-shadow has an inset keyword available — putting this at the start of a shadow declaration causes it to become an inner shadow, rather than an outer shadow.
... note: there is another item that can be set in the box-shadow value — another length value can be optionally set just before the color value, which is a spread radius.
...you could also swap the values for some others.
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Flexbox - Learn web development
so for example, you can replace flex-direction: row; flex-wrap: wrap; with flex-flow: row wrap; flexible sizing of flex items let's now return to our first example, and look at how we can control what proportion of space flex items take up compared to the other flex items.
... first, add the following rule to the bottom of your css: article { flex: 1; } this is a unitless proportion value that dictates how much of the available space along the main axis each flex item will take up compared to other flex items.
...it is relative to other flex items, meaning that giving each flex item a value of 400000 would have exactly the same effect.
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What is the difference between webpage, website, web server, and search engine? - Learn web development
search engine a web service that helps you find other web pages, such as google, bing, yahoo, or duckduckgo.
... deeper dive so, let's dig deeper into how those four terms are related and why they are sometimes confused with each other.
...such documents are written in the html language (which we look into in more detail in other articles).
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How to build custom form controls - Learn web development
the control was active and the user moves the focus to another control using the keyboard (e.g.
... the control is in its open state when: the control is in any other state than open and the user clicks on it.
... another fun example: what will happen if the user hits the up or down arrow keys while the control is in the open state?
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Styling web forms - Learn web development
the good to style form controls that are easy to style with css, you shouldn't face much if any difficulties, since they mostly behave like any other html element.
...this is another reason to use <button> elements over their equivalent input types!
...to give the same size to several different widgets, you can use the box-sizing property along with some consistent values for other properties: input, textarea, select, button { width : 150px; padding: 0; margin: 0; box-sizing: border-box; } in the screenshot below, the left column shows the default rendering of an <input type="radio">, <input type="checkbox">, <input type="range">, <input type="text">, <input type="date"> input, <select>, <textarea>,<input type="submit">, and <button>.
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Debugging HTML - Learn web development
<strong>strong <em>strong emphasised?</strong> what is this?</em> <li>unclosed attributes: another common source of html problems.
...looking at the image above, this doesn't seem to have affected the markup rendering too badly, as it is easy to infer where one element should end and another should begin.
... in the dom inspector, you can see what the rendered markup looks like: using the dom inspector, let's explore our code in detail to see how the browser has tried to fix our html errors (we did the review in firefox; other modern browsers should give the same result): the paragraphs and list items have been given closing tags.
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What’s in the head? Metadata in HTML - Learn web development
it contains information such as the page <title>, links to css (if you choose to style your html content with css), links to custom favicons, and other metadata (data about the html, such as the author, and important keywords that describe the document.) in this article we'll cover all of the above and more, in order to give you a good basis for working with markup.
... the <title> element contents are also used in other ways.
...of course, the other stuff we are talking about in this article could also be thought of as metadata too.
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HTML table advanced features and accessibility - Learn web development
the <tbody> element needs to wrap the other parts of the table content that aren't in the table header or footer.
...you might wonder why you ought to bother including it at all — you should, because it gives you more control over your table structure and styling.
... nesting tables it is possible to nest a table inside another one, as long as you include the complete structure, including the <table> element.
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What went wrong? Troubleshooting JavaScript - Learn web development
okay, so it's not quite that simple — there are some other differentiators as you drill down deeper.
...you should see an error message along the following lines: this is a pretty easy error to track down, and the browser gives you several useful bits of information to help you out (the screenshot above is from firefox, but other browsers provide similar information).
...another error!
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Framework main features - Learn web development
it was invented by the react team for use in react applications, but can be used to develop other applications — like vue apps, for instance.
... given this handlebars template: <header> <h1>hello, {{subject}}!</h1> </header> and this data: { subject: "world" } handlebars will build html like this: <header> <h1>hello, world!</h1> </header> typescript typescript is a superset of javascript, meaning it extends javascript — all javascript code is valid typescript, but not the other way around.
...to render this component, we would write code like this in the place where we want it rendered (which will probably be inside another component): <authorcredit src="./assets/zelda.png" alt="portrait of zelda schiff" byline="zelda schiff is editor-in-chief of the library times." /> this will ultimately render the following <figure> element in the browser, with its structure as defined in the authorcredit component, and its content as defined in the props included on the authorcredit component call: <figure> <img s...
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Componentizing our Svelte app - Learn web development
it will help you understand how they relate to each other, it will promote reuse, and it will make your code easier to reason about, maintain, and extend.
... other people apply the same techniques used for deciding if you should create a new function or object.
... both approaches should complement each other, and help you decide how to better organize your components.
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Working with Svelte stores - Learn web development
in this article we will show another way to handle state management in svelte — stores.
...in this case, the alert component is independent from the rest — it is not a parent or child of any other — so the messages don't fit into the component hierarchy.
... repl to code along with us using the repl, start at https://svelte.dev/repl/d1fa84a5a4494366b179c87395940039?version=3.23.2 dealing with our app state we have already seen how our components can communicate with each other using props, two-way data binding, and events.
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Getting started with Vue - Learn web development
a clearer vue vue is a modern javascript framework that provides useful facilities for progressive enhancement — unlike many other frameworks, you can use vue to enhance existing html.
... as you work through this tutorial, you might want to keep the vue guide and api documentation open in other tabs, so you can refer to them if you want more information on any sub topic.
... for a good (but potentially biased) comparison between vue and many of the other frameworks, see vue docs: comparison with other frameworks.
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Debugging on Mac OS X
these builds enable hardened runtime and only differ from production builds in that they are not notarized which should not otherwise affect functionality, (other than the ability to easily launch the browser on macos 10.15+ -- see quarantine note below).
...select the "cross-platform" tab then under the "other" template group select the "empty" project type.
...set the executable by clicking on "none" and selecting "other...".
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Eclipse CDT Manual Setup
some of it like the section on building the index and usage tips are still relevant, and other parts still may provide useful background information to understand it in more detail on how eclipse works.
...like some other ides, that are used with projects like mozilla that have their own build system.
... select "general > workspace" and select "refresh using native hooks or polling" and "refresh on access" to prevent eclipse giving you annoying "resource is out of sync" messages when files change from under it due to mercurial or other external activity.
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mach
you can add the command to your .profile so it will run automatically when you start the shell: source /path/to/mozilla-central/python/mach/bash-completion.sh this will enable tab completion of mach command names, and in the future it may complete flags and other arguments too.
...why even bother with a competing build system in arch when octopi does what you want and even has a gui?
... another possible reason: mach gives you an error, while running, say bootstrap.py directly (that is to type in a bash shell: python2 ./bootstrap.py enter-key ) in an otherwise empty ..../subdir/ may work for you!
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Performance best practices for Firefox front-end engineers
this guide will help firefox developers working on front-end code produce code which is as performant as possible—not just on its own, but in terms of its impact on other parts of firefox.
... always keep in mind the side effects your changes may have, from blocking other tasks, to interfering with other user interface elements.
...doing so might cause flushes to occur for other promisedocumentflushed callbacks that are scheduled to fire in the same tick of the refresh driver.
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HTML parser threading
it also has another lazily initialized tokenizer/tree builder for speculatively scanning the tail of document.write() data when the parser blocks without parsing the document.write() data to completion.
...each tree op represents a small operation, such as element creation or appending a node into another, that can later be performed on the main thread.
...for other atoms, the parser uses nshtml5atom objects that are atomic only within the scope of an nshtml5atomtable.
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Using JavaScript code modules
creating a javascript code module a very simple javascript module looks like this: var exported_symbols = ["foo", "bar"]; function foo() { return "foo"; } var bar = { name : "bar", size : 3 }; var dummy = "dummy"; notice that the module uses normal javascript to create functions, objects, constants, and any other javascript type.
...r example: components.utils.import("resource://app/my_module.jsm"); alert(foo()); // displays "foo" alert(bar.size + 3); // displays "6" alert(dummy); // displays "dummy is not defined" because 'dummy' was not exported from the module note: when you're testing changes to a code module, be sure to change the application's build id (e.g., the version) before your next test run; otherwise, you may find yourself running the previous version of your module's code.
... if you're writing an extension for firefox 4 and already have a chrome.manifest with a content instruction in it, you can put the code module in your content folder and reference it like your other content files via chrome://<yourextension>/content/<yourmodule>.jsm.
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sslerr.html
it is a generic error, used when none of the other more specific error codes defined in this file applies.
...it is a generic error, used when none of the other more specific error codes defined in this file applies.
... ssl_error_fortezza_pqg -12267 "cannot connect: ssl peer is in another fortezza domain." the local system and the remote system are in different fortezza domains.
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Tracing JIT
the nanojit component is language agnostic, and contains no knowledge about spidermonkey or any other part of the mozilla codebase.
... a fragment represents a single linear code sequence, typically terminating in a jump to another fragment or back to the beginning of the fragment.
...in other words, an assembler transforms lir code into native code.
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JS_THREADSAFE
for each thread that is in a request: almost any call into the jsapi may trigger garbage collection; but garbage collection does not happen at any other time (such as, for example, at the moment before the return value of js_newobject is assigned to a rooted variable).
...in a multithreaded program, even if the calling thread has been idle, other threads may be active or may call js_gc().
...when one thread calls js_gc or otherwise finds that garbage collection is necessary, it must wait for all other threads that are in requests to pause before garbage collection can occur.
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Redis Tips
but obviously, calling ice cream a nowhale food doesn't give you any sense of how good the ice cream is, or what sets it apart from other kinds of food that aren't made from whale meat but that are also very unlike ice cream -- it just gives the whaling industry a way to lump together people who don't use their products.
... redis> get foo (nil) redis> setnx foo 17 (integer) 1 redis> get foo "17" redis> setnx foo 42 (integer) 0 the return value from setnx is 1 if the value was set, 0 otherwise.
... note that if one of your commands crashes, the others still all execute!
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Places Developer Guide
other bookmarks apis note: this document covers the toolkit places services.
... apis that are browser-specific: fuel - a collection of wrapper apis for easing access to a number of firefox utilities and services nsiplacestransactionsservice - a firefox service for modifying bookmarks in a transactional manner, providing facilities for undo/redo places utilities for javascript - accessors and helper functions for firefox and extensions creating bookmarks, folders and other items creating a bookmark // create an nsiuri for the url to be bookmarked.
... moveitem (afolderid, anewparentid, aindex) - move an item from one folder to another.
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Packaging WebLock
« previousnext » in this final part of the tutorial, we'll put all of the pieces of the web locking component - the library itself, the type library, the header file, and the user interface resources - into a package that can be installed on other systems.
... like the windows registry, the chrome registry is a database of information about applications, skins, and other extensions that have been installed in a gecko application.
... since mozilla and other gecko-based applications are cross-platform, this database is abstracted above the operating system or any particular platform's registry.
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IAccessibleTable2
other-licenses/ia2/accessibletable2.idlnot scriptable this interface gives access to a two-dimensional table.
...otherwise a null pointer is returned.
...isselected returns true if the specified column is selected completely and false otherwise.
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IAccessibleText
other-licenses/ia2/accessibletext.idlnot scriptable a structure containing a substring and the start and end offsets in the enclosing string.
... return value s_false if the caret is not currently active on this object, that is the caret is located on some other object.
...it represents the current input position and will therefore typically be queried by at more often than other positions.
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nsINavBookmarksService
note: renamed from bookmarksroot in gecko 1.9 placesroot long long the item id of the top-level folder that contains bookmarks, tags and all other places data.
...for js or from other components, just please be very careful to close the batch, especially when encountering an error and returning early.
... return value returns true if the folder is marked as read-only, otherwise returns false.
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nsINavHistoryResultNode
toolkit/components/places/public/nsinavhistoryservice.idlscriptable this is the base class for all places history result nodes, containing the uri, title, and other general information.
...for other nodes, this value is 0.
...for other nodes, this value is set to -1.
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nsIScriptableIO
other documentation on files and i/o not using the unavailable nsiscriptableio apis: code snippets: file i/o, open and save dialogs, reading textual data, writing textual data, list of file-related error codes.
...for example: io.getfile("profile", "cookies.txt"); from an xpcom component, however, you will need to get a reference as with other components: var scriptableio = components.classes["@mozilla.org/io/scriptable-io;1"] .getservice(); scriptableio.getfile("profile", "cookies.txt"); method overview nsifile getfile(in astring alocation, in astring afilename); nsifile getfilewithpath(in astring afilepath); nsisupports newinputstream(in nsivariant abase, in...
... nsiinputstream: a stream returned by a previous call to this method, or any other object that implements nsiinputstream.
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Add to iPhoto
this extension for mac os x serves as a demonstration of how to use js-ctypes to call mac os x carbon, core foundation, and other system frameworks from an extension written entirely in javascript.
...among these are routines for managing cfstring, cfurl, and cfarray objects, among others.
... these are core system data formats that are used by other frameworks, and we'll be making use of them.
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Plug-in Basics - Plugins
a plug-in consumes no resources other than disk space when it is not loaded.
...plug-ins consume no resources (other than disk space) when not loaded.
...i found other way how check which paths support firefox : $ strace -y /usr/bin/firefox 2>&1 | grep acces | grep -v search | grep plugins access("/home/user_name/.mozilla/firefox/dqh2nb5k.default-1441864569209/plugins", f_ok) = -1 enoent (no such file or directory) access("/home/user_name/.mozilla/plugins", f_ok) = -1 enoent (no such file or directory) access("/usr/lib64/firefox/browser/plugins", f_ok) = -1 en...
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Debugger.Script - Firefox Developer Tools
a dom event handler, whether embedded in html or attached to the element by other javascript code.
...this allows the code using each debugger instance to place whatever properties it likes on its debugger.script instances, without worrying about interfering with other debuggers.) a debugger.script instance is a strong reference to a jsscript object; it protects the script it refers to from being garbage collected.
...false otherwise.
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AudioListener - Web APIs
the forward and up values are linearly independent of each other.
...the forward and up values are linearly independent of each other.
...the forward and up values are linearly independent of each other.
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Drawing shapes with canvas - Web APIs
all other shapes must be created by combining one or more paths.
...the anticlockwise parameter is a boolean value which, when true, draws the arc anticlockwise; otherwise, the arc is drawn clockwise.
... note: this example requires a slightly larger canvas than the others on this page: 150 x 200 pixels.
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Using files from web applications - Web APIs
if you want to use the dom file api from extensions or other browser chrome code, you can; however, note there are some additional features to be aware of.
...note that in this case the input element must not be hidden using display: none (nor visibility: hidden), otherwise the label would not be keyboard-accessible.
...in addition, it displays other file information including their names and sizes.
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The HTML DOM API - Web APIs
access to the browser navigation history supporting and connective interfaces for other apis such as web components, web storage, web workers, websocket, and server-sent events.
...discussion of other areas, such as drag and drop, websockets, web storage, etc.
... nodes may be strictly organizational, providing a means for grouping other nodes together or for providing a point at which a hierarchy can be constructed; other nodes may represent visible components of a document.
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Pointer events - Web APIs
however, since many devices support other types of pointing input devices, such as pen/stylus and touch surfaces, extensions to the existing pointing device event models are needed.
... additionally, a pointer event contains the usual properties present in mouse events (client coordinates, target element, button states, etc.) in addition to new properties for other forms of input: pressure, contact geometry, tilt, etc.
... pointer capture pointer capture allows the events for a pointer to be retargeted to a particular element other than the normal hit test result of the pointer's location.
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Service Worker API - Web APIs
they are intended, among other things, to enable the creation of effective offline experiences, intercept network requests and take appropriate action based on whether the network is available, and update assets residing on the server.
...the point where this event fires is generally a good time to clean up old caches and other things associated with the previous version of your service worker.
... other use case ideas service workers are also intended to be used for such things as: background data synchronization.
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Web Video Text Tracks Format (WebVTT) - Web APIs
zero or more characters other than those noted above.
...the example where we wanted the transcription text to be red highlighted and the other part to remain normal, we can define it as follows using css.
... in addition to the three escape sequences mentioned above, there are fours others.
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Using Web Workers - Web APIs
worker()) that runs a named javascript file — this file contains the code that will run in the worker thread; workers run in another global context that is different from the current window.
...it accepts zero or more uris as parameters to resources to import; all of the following examples are valid: importscripts(); /* imports nothing */ importscripts('foo.js'); /* imports just "foo.js" */ importscripts('foo.js', 'bar.js'); /* imports two scripts */ importscripts('//example.com/hello.js'); /* you can import scripts from other origins */ the browser loads each listed script and executes it.
... however, since web workers have carefully controlled communication points with other threads, it's actually very hard to cause concurrency problems.
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ARIA: application role - Accessibility
description the application role indicates to assistive technologies that this part of the web content contains elements that do not conform to any other known html element or wai-aria widget.
... in this mode, the web author is completely responsible for handling any and all keyboard input, focus management, and other interactions and cannot assume assistive technologies would do any processing on their end.
... background for historic reasons, especially on windows, screen readers and some other assistive technologies (at) have traditionally grabbed the whole web content from the browser at once after it had finished loading.
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Block and inline layout in normal flow - CSS: Cascading Style Sheets
for elements with a block formatting context, the spec says: “in a block formatting context, boxes are laid out one after the other, vertically, beginning at the top of a containing block.
... in a block formatting context, each box's left outer edge touches the left edge of the containing block (for right-to-left formatting, right edges touch).” - 9.4.1 for elements with an inline formatting context: “in an inline formatting context, boxes are laid out horizontally, one after the other, beginning at the top of a containing block.
... elements participating in a block formatting context block elements in a horizontal writing mode such as english, layout vertically, one below the other.
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Variable fonts guide - CSS: Cascading Style Sheets
however, the w3c’s intent was for this syntax not to be used when other attributes are available.
... therefore wherever possible, the appropriate property should be used, with the lower-level syntax of font-variation-settings only being used to set values or axes not available otherwise.
... it should be noted that at this point there is no way in the @font-face declaration to 'map' a specific point on the variation axis of a variable font to the keyword bold (or any other keyword).
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CSS grids, logical values, and writing modes - CSS: Cascading Style Sheets
for this guide, we will look at this feature of grid and other modern layout methods, learning a little about writing modes and logical vs.
...in the code snippet below, the item is placed 20 pixels from the top, and 30 pixels from the left of the container: .container { position: relative; } .item { position: absolute; top: 20px; left: 30px; } <div class="container"> <div class="item">item</div> </div> another place you might see physical keywords in use, is when using text-align: right to align text to the right.
... 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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CSS Grid Layout and Progressive Enhancement - CSS: Cascading Style Sheets
the supporting browsers other than in internet explorer, css grid layout is unprefixed in safari, chrome, opera, firefox and edge.
...you could start by simply enhancing elements in your design with grid, that could otherwise display using an older method.
... overwriting of legacy methods with grid layout works surprisingly well, due to the way grid interacts with these other methods.
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place-content - CSS: Cascading Style Sheets
if it is invalid for one or the other, the whole value will be invalid.
... values start the items are packed flush to each other toward the start edge of the alignment container in the appropriate axis.
... end the items are packed flush to each other toward the end edge of the alignment container in the appropriate axis.
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<input type="url"> - HTML: Hypertext Markup Language
you should also include other explanatory text nearby.
...it is not as semantically useful as other ways to explain your form, and can cause unexpected technical issues with your content.
...this may be based upon a parent's spellcheck setting or other factors.
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Link types - HTML: Hypertext Markup Language
in html, link types indicate the relationship between two documents, in which one links to the other using an <a>, <area>, <form>, or <link> element.
... otherwise, the link defines an alternative page, of one of these types: for another medium, like a handheld device (if the media attribute is set) in another language (if the hreflang attribute is set), in another format, such as a pdf (if the type attribute is set) a combination of these <a>, <area>, <link> <form> archives de...
... note: other link types related to linking resources in the same sequence are last, prev, next.
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Using the application cache - HTML: Hypertext Markup Language
subsequent visits to that document cause the browser to load the document and other assets specified in the manifest file from the application cache (not from the server).
... important: do not specify the manifest itself in the cache manifest file, otherwise it will be nearly impossible to inform the browser a new manifest is available.
... example 2: a more complete cache manifest file the following is a more complete cache manifest file for the imaginary web site at www.example.com: cache manifest # v1 2011-08-14 # this is another comment index.html cache.html style.css image1.png # use from network if available network: network.html # fallback content fallback: .
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Content negotiation - HTTP
over the years, other content negotiation proposals, like transparent content negotiation and the alternates header, have been proposed.
... server-driven content negotiation in server-driven content negotiation, or proactive content negotiation, the browser (or any other kind of user-agent) sends several http headers along with the url.
... the accept header is defined by the browser, or any other user-agent, and can vary according to the context, like fetching an html page or an image, a video, or a script: it is different when fetching a document entered in the address bar or an element linked via an <img>, <video> or <audio> element.
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Index - HTTP
the apis that are restricted are: 33 csp: default-src csp, directive, http, reference, security the http content-security-policy (csp) default-src directive serves as a fallback for the other csp fetch directives.
...on the other side, if the content has changed, etags are useful to help prevent simultaneous updates of a resource from overwriting each other ("mid-air collisions").
...for put and other non-safe methods, it will only upload the resource in this case.
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HTTP headers - HTTP
custom proprietary headers have historically been used with an x- prefix, but this convention was deprecated in june 2012 because of the inconveniences it caused when nonstandard fields became standard in rfc 6648; others are listed in an iana registry, whose original content was defined in rfc 4229.
... timing-allow-origin specifies origins that are allowed to see values of attributes retrieved via features of the resource timing api, which would otherwise be reported as zero due to cross-origin restrictions.
... cross-origin-opener-policy (coop) prevents other domains from opening/controlling a window.
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Closures - JavaScript
in other words, a closure gives you access to an outer function’s scope from an inner function.
...one way of doing this is to specify the font-size of the body element (in pixels), and then set the size of the other elements on the page (such as headers) using the relative em unit: body { font-family: helvetica, arial, sans-serif; font-size: 12px; } h1 { font-size: 1.5em; } h2 { font-size: 1.2em; } such interactive text size buttons can change the font-size property of the body element, and the adjustments are picked up by other elements on the page thanks to the relative units.
... emulating private methods with closures languages such as java allow you to declare methods as private, meaning that they can be called only by other methods in the same class.
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Working with objects - JavaScript
objects overview objects in javascript, just as in many other programming languages, can be compared to objects in real life.
...lt = []; for(objecttoinspect = o; objecttoinspect !== null; objecttoinspect = object.getprototypeof(objecttoinspect)) { result = result.concat( object.getownpropertynames(objecttoinspect) ); } return result; } this can be useful to reveal "hidden" properties (properties in the prototype chain which are not accessible through the object, because another property has the same name earlier in the prototype chain).
...identical object initializers create distinct objects that will not compare to each other as equal.
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Promise - JavaScript
not to be confused with: several other languages have mechanisms for lazy evaluation and deferring a computation, which they also call "promises", e.g.
...you will also hear the term resolved used with promises — this means that the promise is settled or “locked in” to match the state of another promise.
...(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.
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Autoplay guide for media and Web Audio APIs - Web media technologies
sume that media will be allowed to autoplay only if at least one of the following is true: the audio is muted or its volume is set to 0 the user has interacted with the site (by clicking, tapping, pressing keys, etc.) if the site has been whitelisted; this may happen either automatically if the browser determines that the user engages with media frequently, or manually through preferences or other user interface features if the autoplay feature policy is used to grant autoplay support to an <iframe> and its document.
... otherwise, the playback will likely be blocked.
... note: put another way, playback of any media that includes audio is generally blocked if the playback is programmatically initiated in a tab which has not yet had any user interaction.
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Web Performance
we cover them in this section: key performance guides animation performance and frame rateanimation on the web can be done via svg, javascript, including <canvas> and webgl, css animation, <video>, animated gifs and even animated pngs and other image types.
... the performance cost of animating a css property can vary from one property to another, and animating expensive css properties can result in jank as the browser struggles to hit a smooth frame rate.critical rendering paththe critical rendering path is the sequence of steps the browser goes through to convert the html, css, and javascript into pixels on the screen.
...these perceptions are impacted by actual page load time, idling, responsiveness to user interaction, and the smoothness of scrolling and other animations.
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Namespaces crash course - SVG: Scalable Vector Graphics
the problem with mixing content from different xml dialects in a single xml document is that the elements defined by one dialect may have the same name as elements defined by another.
...(in fact uris are used so frequently that the term "namespace uri" is commonly used instead of "namespace name".) redeclaring the default namespace so if all the descendants of the root element are also defined to be in the default namespace, how do you mix in content from another namespace?
...this parameter is commonly used by other xml dialects as a means to link to external resources.
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Same-origin policy - Web security
the same-origin policy is a critical security mechanism that restricts how a document or script loaded from one origin can interact with a resource from another origin.
...(a "tuple" is a set of items that together comprise a whole — a generic form for double/triple/quadruple/quintuple/etc.) the following table gives examples of origin comparisons with the url http://store.company.com/dir/page.html: url outcome reason http://store.company.com/dir2/other.html same origin only the path differs http://store.company.com/dir/inner/another.html same origin only the path differs https://store.company.com/page.html failure different protocol http://store.company.com:81/dir/page.html failure different port (http:// is port 80 by default) http://news.company.com/dir/page.html failure differ...
... these exceptions are nonstandard and unsupported in any other browser.
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context-menu - Archive of obsolete content
it does not occur when the user invokes the context menu on a link, image, or other non-text node, or while a selection exists.
... array an array of any of the other types.
...like other apis in the sdk, the context-menu api uses content scripts to let your add-on interact with pages in the browser.
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JavaScript Daemons Management - Archive of obsolete content
* all other optional instances methods depend on this one or on the previous ones.
... when a method requires the presence of another method (it is relatively rare), there is a comment which explains why.
...this.index : this.length - this.index, breverse, bforce); }; daemon.prototype.reclose = function (bforce) { /* warning: this method requires the daemon.prototype.makesteps() and daemon.prototype.close() methods */ return this.close(this.isatend() !== this.backw, bforce || false); }; /* others */ daemon.prototype.restart = function () { this.stop(); this.start(); }; daemon.prototype.loopuntil = function (vdate) { if (!isfinite(this.length)) { return; } var ntime = vdate.constructor === date ?
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Enhanced Extension Installation - Archive of obsolete content
this can lead to incompatibilities, mysterious crashes and other problems.
... tracking item type item type is tracked for the most part by containment in one or other of the two containers.
...these include: the application profile directory <profile>/extensions/ the application install directory <application>/extensions/ any location specified in a text file with a {guid} name placed in one of the above locations, useful for developing extensions at another location, e.g.
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Appendix A: Add-on Performance - Archive of obsolete content
other add-ons have most of their features depend on a user being logged in to a service.
... page loads this is another critical route that many add-ons tap into.
...this is what you should do first to make sure that you filter out all cases that don't interest you so that your add-on doesn't slow down other requests.
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Local Storage - Archive of obsolete content
otherwise you may run into problems if the same extension is installed in multiple profiles.
... let localdir = directoryservice.get("profd", ci.nsifile); localdir.append("xulschool"); if (!localdir.exists() || !localdir.isdirectory()) { // read and write permissions to owner and group, read-only for others.
...in general this is the only directory flag you'll need, but sometimes you'll need access to other system directories, and you don't want to have to worry about which operating system or system language your extension is running on.
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Setting Up a Development Environment - Archive of obsolete content
on the other hand, extensions use the same (or similar) languages that are used for web development, so most text editors and ides are up to the task.
...that is more than what you can get with most other editors, so we recommend you to give it a try.
... you should also set up your environment so that xpidl.exe (or just xpidl on other systems) is in the default executable path, and also add a variable called gecko_sdk, that points to your sdk build: export gecko_sdk=/path/to/your/sdk our build system should pick it up from there.
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Inner-browsing extending the browser navigation paradigm - Archive of obsolete content
that new page may have links that take you to other pages, which may in turn have more links, and so on.
...for web developers, for example, it provides less fine-grained control over the experience, and it can strain bandwidth and other resources.
...an implementation can also use other transport technologies such as soap-based remote procedure calls, xmlhttprequest interfaces, or dom 3 load.
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MCD, Mission Control Desktop, AKA AutoConfig - Archive of obsolete content
for netscape 4.x the convert function from the client customization kit (cck) could also do that (and other things like personalize auto-installation...): http://developer.netscape.com/docs/manuals/deploymt/config.htm.
... 569 01-01-2010 00:00 defaults/profile/mimetypes.rdf 76 01-01-2010 00:00 defaults/preferences/firefox-l10n.js 91656 01-01-2010 00:00 defaults/preferences/firefox.js 1593 01-01-2010 00:00 defaults/preferences/firefox-branding.js 473 01-01-2010 00:00 defaults/profile/prefs.js unlike old thunderbird 8, firefox 8 didn't include prefcalls.js in omni.jar , but other .js files though: [root@arvouin firefox]# jar tvf omni.jar | grep defaults/pref 0 fri nov 04 21:34:18 cet 2011 defaults/preferences/ 604 fri nov 04 21:34:18 cet 2011 defaults/preferences/all-redhat.js 1389 fri nov 04 21:34:18 cet 2011 defaults/preferences/firefox-branding.js 76 fri nov 04 21:34:18 cet 2011 defaults/preferences/firefox-l10n.js 50295 fri nov 04 21:34:18 cet 2011 def...
...c=int-evry,dc=fr","uid=" + env_user,"uid,cn,mail,labeleduri"); // close the try, and call the catch() } catch(e) {displayerror("lockedpref", e);} debug if you set a username and the mozilla_debug variable ($export mozilla_debug=1; export user=procacci), then the displayerror() will show you this popup: that's a popup titled as "error", but it's just a debug tool for me as i didn't find any other way to popup information.
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JavaScript Client API - Archive of obsolete content
records are transformed to wbo's, uploaded to a collection in a sync server and eventually downloaded by other sync clients.
...the name store is somewhat of a misnomer, as stores don't actually persistently store anything, but rather serve as short-lived data stores during the course of a single sync and act as proxies to other data stores within the application (like the places database) outside of sync.
...it is possible for other components, including 3rd party extensions, to supplement the set of engines and synchronize their own data.
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New Skin Notes - Archive of obsolete content
devmo skin vs cavendish skin --callek i can probably pull-off this patch if needed (quickly), so dria or others do not have to hunt up "how".
...in all other dev centres there is no "visited link color" and we should remove imho.
...this is not what user expects (well, i don't expect sites to style visited and non-visited links the same), and it's false that other documentation sites do this (i just checked apple's and microsoft's sites).
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Elements - Archive of obsolete content
please do not edit only on the basis of another xbl specification.
...it should usually declare xbl as the default namespace (unless an xbl namespace prefix is used) and it may additionally declare other namespace prefixes used in your binding.
...each binding child element defines a unique binding that can be attached to elements in other documents.
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Using XPInstall to Install Plugins - Archive of obsolete content
xpi packages, like zip files, "contain" other files, typically: the software component to be installed.
... install the plugin software to another location on the user's hard disk, so that other mozilla-based browsers that the user may install later can find the plugin (the browser specific components) and pick it up.
...rather than re-initiate the download of the plugin with the yet another browser, the second netscape gecko browser can detect that an installation has already occurred.
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A XUL Bestiary - Archive of obsolete content
in other words, a chrome url like the global pointer above picks up a file called global.css, and the help pointer above could also be written as chrome://help/content, because the name of the package itself is "help." viewing chromes other than mozilla's there is a special flag you can use to start mozilla with some chrome other than the default.
...this section describes xul, xptoolkit, and xpfe, which are in some respects synonymous and in others quite different.
...a loosely analogous relationship might be that xul, xptoolkit, and xpfe are to one another what html, the actual html tags, and an html web page are to one another, respectively.
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Reading from Files - Archive of obsolete content
other documentation on files and i/o not using the unavailable nsiscriptableio apis: code snippets: file i/o, open and save dialogs, reading textual data, writing textual data, list of file-related error codes.
...an input stream provides a means of reading bytes, strings or other values from the file.
...however, a number of other character encodings are available; see reading other character encodings below for details about reading text in other encodings.
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Building Trees - Archive of obsolete content
you can use a template with a tree just like any other template.
...the tree builder implements the nsitreeview interface, so it becomes the tree’s view—in other words, the tree’s view and the tree’s builder are the same object.
...m messages </query> <action> <treechildren> <treeitem uri="?"> <treerow> <treecell label="?subject"/> <treecell label="?sender"/> <treecell label="?date"/> </treerow> </treeitem> </treechildren> </action> </template> </tree> features of the tree builder besides the label of a cell, there are several other cell properties you can set when using the tree builder.
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Commands - Archive of obsolete content
in addition, text fields and other widgets have a number of commands which they already support that you can invoke.
... the other advantage is that several buttons or other ui elements can be hooked up to the same command.
... it is normal to put a group of commands inside a commandset element, together near the top of the xul file, as in the following: <commandset> <command id="cmd_open" oncommand="alert('open!');"/> <command id="cmd_help" oncommand="alert('help!');"/> </commandset> a command is invoked when the user activates the button or other element attached to the command.
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Cross Package Overlays - Archive of obsolete content
applying overlays to other packages note: this section talks about contents.rdf which has been replaced in gecko 1.8 by manifest files.
... overlays have another very useful feature.
...you can also go the other way and have the overlays specify which windows that they apply to.
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Element Positioning - Archive of obsolete content
note that the css global skin of the xul application may also specify a min-width for the buttons and other elements, thus if simply setting the width property does not set the button width as you expect, try also to modify the button min-width property.
...if you specify only one size property, the other is calculated as needed.
...the following example demonstrates this: example 2 : source view <window orient="horizontal" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <hbox> <button label="yes" flex="1"/> <button label="no"/> <button label="i really don't know one way or the other"/> </hbox> </window> the window will initially appear like in the image earlier.
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Features of a Window - Archive of obsolete content
creating another window you can create a second window for your application in the same manner as you would create the first one.
...you can use this reference to call functions of the other window.
...if you only specify one, the other will be set to 0.
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Manifest Files - Archive of obsolete content
you can specify multiple packages by including another line in the manifest file.
...otherwise, if an extension attempted to call the modified versions, it would likely not work properly, or worse, create a security hole.
... installing a package for an application to be installed, you will need to create an installer for it, or include it as part of another application.
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Skinning XUL Files by Hand - Archive of obsolete content
button.plain { border: 0px !important; } the global skin, in which styles for these several button classes and dozens of other elements are defined, is described in the following section.
...to avoid this, the makers of the css specification have created some rules of precedence that look at how many different rules have been defined for an element, where the style definitions appear (i.e., externally in a css file or inline), where the elements themselves appear, and other esoteric variables.
...the following table shows the basic format for these two common types of style definitions: class id element.class { attribute: value; } element#id { attribute: value; } menu.baseline { border: 0px; font-size: 9pt; } menu#edit { color: red; } other style subgroups contextualsubgroups -- elements appearing within other elements, such as italicized text anywhere within a <p> element or a <div> -- can be grouped in css, but this is an extremely inefficient way to style xul, and is frowned upon in the mozilla development community (again, refer to the skinning guidelines in writing skinnable xul and css for more info); css2 also provides some ...
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Trees - Archive of obsolete content
for instance, you cannot change the appearance of the tree rows using the style attribute or with other css properties and the box related features such as flexibility and orientation cannot be used.
... in addition, mouse and other user interface events do not fire at these elements.
...however, there are special ways of styling the tree and setting other features which we will see in later sections.
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XPCOM Interfaces - Archive of obsolete content
the syntax of a contract id is: @<internetdomain>/module[/submodule[...]];<version>[?<name>=<value>[&<name>=<value>[...]]] other components can be referred to in a similar way.
...for example, to get a sound interface, you can do the following: var sound = components.classes["@mozilla.org/sound;1"].createinstance(); if (sound) sound.queryinterface(components.interfaces.nsisound); xpcom interfaces can inherit from other interfaces.
... the interfaces that inherit from others have their own functions and the functions of all the interfaces that they inherit from.
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listbox - Archive of obsolete content
if the element contains more than this number of rows, a scrollbar will appear which the user can use to scroll to the other rows.
...be aware, however, that some elements, such as textbox will display the value visually, so in order to merely associate data with an element, you could 1) use another attribute like "value2" or "data-myatt" (as in the html5 draft), as xul does not require validation (less future-proof); 2) use setattributens() to put custom attributes in a non-xul namespace (serializable and future-proof); 3) use setuserdata() (future-proof and clean, but not easily serializable).
...upnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata additemtoselection( item ) return type: no return value selects the given item, without deselecting any other items that are already selected.
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calICalendarView - Archive of obsolete content
because of this close association between methods and attributes on the one hand, and content on the other, calicalendarview implementations are particularly well suited to xbl.
...this link allows the calicalendarview to have a way of creating, modifying, and deleting events based on user interaction with the dom nodes it controls, often without requiring any other user interaction.
... in general, therefore, a calicalendarview will not provide its own controller, but rather rely on other code to set this attribute.
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Sunbird Theme Tutorial - Archive of obsolete content
you might be able to apply the same method to other mozilla applications by changing some of the details.
... adding other components your theme only modifies the calendar component.
...to understand the user interface provided by these other components, unpack the other jar files.
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Theme changes in Firefox 2 - Archive of obsolete content
tton:hover:active toolbar[iconsize="small"] #print-button:hover toolbar[iconsize="small"] #print-button:hover:active toolbar[iconsize="small"] #reload-button:hover toolbar[iconsize="small"] #reload-button:hover:active toolbar[iconsize="small"] #stop-button:hover toolbar[iconsize="small"] #stop-button:hover:active toolbarbutton.bookmark-item-microsummarized you may need to make changes to other styles as well.
...chbar-engine-button .search-go-button .search-go-button:hover .search-go-button:hover:active .search-go-button[disabled="true"] .searchbar-engine-button .searchbar-engine-button:hover .searchbar-engine-button[addengines="true"] .searchbar-engine-button[open="true"] .searchbar-engine-menuitem[selected="true"] > .menu-iconic-text .searchbar-left you may of course wish to make changes to other styles as well.
...o[pane=panemain]:active radio[pane=panemain]:hover radio[pane=panemain][selected="true"] radio[pane=paneprivacy]:hover radio[pane=paneprivacy][selected="true"] radio[pane=panesecurity] radio[pane=panesecurity]:active radio[pane=panesecurity]:hover radio[pane=panesecurity][selected="true"] radio[pane=panetabs]:hover radio[pane=panetabs][selected="true"] you may of course wish to change other styles as well.
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Introduction to game development for the Web - Game development
instead, you can advertise and promote your game all over the web as well as other media, taking advantage of the web's inherent linkability and shareability to reach new customers.
...no waiting breathlessly for approval while someone hidden within another company decides whether or not your critical bug fix will ship today or tomorrow.
... gamepad api if you want your users to be able to use gamepads or other game controllers to work your game, you'll need this api.
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Audio for Web games - Game development
for other more active sounds that are to be used during the game we could consider priming them as soon as something like a start button is pressed.
...loading synchronously might mean parts of your music are ready earlier and you can start playing them while others load.
...avi</a> <p class="loading-text">loading...</p> <button data-playing="false" aria-describedby="clavi-play-label"> <span id="clavi-play-label">play</span> </button> </li> </ul> <p class="sourced">all tracks sourced from <a href="http://jplayer.org/">jplayer.org</a></p> </section> all of these tracks are the same tempo and are designed to be synchronized with each other, so we need to make sure they are loaded and available to the api before we are able to play them.
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Backgrounds and borders - Learn web development
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.
... you can use keywords such as top and right (look up the others on the background-position page): .box { background-image: url(star.png); background-repeat: no-repeat; background-position: top center; } and lengths, and percentages: .box { background-image: url(star.png); background-repeat: no-repeat; background-position: 20px 10%; } you can also mix keyword values with lengths or percentages, for example: .box { background-image: url(...
... when you do this you may end up with background images overlapping each other.
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Grids - Learn web development
by default these display in normal flow so the boxes display one below the other.
...declaring display: grid gives you a one column grid, so your items will continue to display one below the other as they do in normal flow.
...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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What is a URL? - Learn web development
a url is composed of different parts, some mandatory and others optional.
...the web requires one of these two, but browsers also know how to handle other protocols such as mailto: (to open a mail client) or ftp: to handle file transfer, so don't be surprised if you see such protocols.
...otherwise it is mandatory.
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How the Web works - Learn web development
the other parts of the toolbox the client and server we've described above don't tell the whole story.
... there are many other parts involved, and we'll describe them below.
...on the other end of the road is the server, which is a shop you want to buy something from.
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Video and audio content - Learn web development
another such situation is the always-popular mp3 file.
... other <video> features there are a number of other features you can include when displaying an html video.
...other differences from html video are as follows: the <audio> element doesn't support the width/height attributes — again, there is no visual component, so there is nothing to assign a width or height to.
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Looping code - Learn web development
previous overview: building blocks next programming languages are very useful for rapidly completing repetitive tasks, from multiple basic calculations to just about any other situation where you've got a lot of similar items of work to complete.
... why bother?
...let's look at another example that takes a number as an input, and returns only the numbers that are squares of integers (whole numbers).
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Storing the information you need — Variables - Learn web development
previous overview: first steps next after reading the last couple of articles you should now know what javascript is, what it can do for you, how you use it alongside other web technologies, and what its main features look like from a high level.
... another special thing about variables is that they can contain just about anything — not just strings and numbers.
... you shouldn't use other characters because they may cause errors or be hard to understand for an international audience.
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Object-oriented JavaScript for beginners - Learn web development
the basic idea of oop is that we use objects to model real world things that we want to represent inside our programs, and/or provide a simple way to access functionality that would otherwise be hard or impossible to make use of.
...in oop, we can create new classes based on other classes — these new child classes can be made to inherit the data and code features of their parent class, so you can reuse functionality common to all the object types rather than having to duplicate it.
...you can now see that we have two new objects on the page, each of which is stored under a different namespace — when you access their properties and methods, you have to start calls with person1 or person2; the functionality contained within is neatly packaged away so it won't clash with other functionality.
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Object building practice - Learn web development
our little balls will bounce around on the screen, and change color when they touch each other.
...along the way we'll make use of some nifty objects, and show you a couple of nice techniques like bouncing balls off walls, and checking whether they have hit each other (otherwise known as collision detection).
...25)'; ctx.fillrect(0, 0, width, height); for (let i = 0; i < balls.length; i++) { balls[i].draw(); balls[i].update(); } requestanimationframe(loop); } all programs that animate things generally involve an animation loop, which serves to update the information in the program and then render the resulting view on each frame of the animation; this is the basis for most games and other such programs.
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React interactivity: Events and state - Learn web development
there are a couple of other things to note: the camel-cased nature of onclick is important — jsx will not recognize onclick (again, it is already used in javascript for a specific purpose, which is related but different — standard onclick handler properties).
... callback props in react applications, interactivity is rarely confined to just one component: events that happen in one component will affect other parts of the app.
...another common convention you may well come across in react code is to prefix callback prop names with the word on, followed by the name of the event that will cause them to be run.
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Creating our first Vue component - Learn web development
along the way, we'll learn about a few important concepts such as calling components inside other components, passing data to them via props, and saving data state.
... objective: to learn how to create a vue component, render it inside another component, pass data into it using props, and save its state.
...additionally, prop validation functions are invoked before the component instance is created, so they do not have access to the component state (or other props).
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Implementing feature detection - Learn web development
lation), unzip the zip file, copy the html5shiv-printshiv.min.js and html5shiv.min.js files into your example directory, and link to one of the files by putting the following under your <title> element: <script src="html5shiv.min.js"></script> have a look at your example css files — you'll see that basic-styling.css handles all the styling that we want to give to every browser, whereas the other two css files contain the css we want to selectively apply to browser depending on their support levels.
... @supports also has or and not logic available — the other block applies the float layout if the flexbox properties are not available: @supports not (flex-flow: row) and (flex: 1) { /* rules in here */ } this may look a lot more convenient than the previous example — we can do all of our feature detection in css, no javascript required, and we can handle all the logic in a single css file, cutting down on http requests.
...generally, such tests are done via one of the following common patterns: summary of javascript feature detection techniques feature detection type explanation example if member in object check whether a certain method or property (typically an entry point into using the api or other feature you are detecting for) exists in its parent object.
...And 4 more matches

Deploying our app - Learn web development
parcel (and indeed many other tools) will generate filenames that are unique to each new build.
... deploying to hosting tends to be at the tail-end of the project life cycle, but with services such as netlify bringing down the cost of deployments (both in financial terms and also the time required to actually deploy) it's possible to deploy during development to either share work in progress or to have a pre-release for some other purpose.
... netlify, amongst other things, also allows you to run pre-deployment tasks, which in our case means that all the production code build processes can be performed inside of netlify and if the build is successful, the website changes will be deployed.
...And 4 more matches

Adding a new event
otherwise, i.e., the event class is just used for internal event class of a dom event class, it should be internal.
... please note that aname must not be same as other event classes even if aprefix is different.
... textevents.h this header file should be used for defining input events from keyboard or ime and also other text edit related events like querying focused content information.
...And 4 more matches

A bird's-eye view of the Mozilla framework
when an html, xml, svg or other type of document is loaded, the nglayout engine (also known as gecko) parses the contents into a dom tree, and handles the layout and rendering of the document pages.
... core services modules such as the nglayout engine comprise the core application services available to other core modules, and xul packages core application modules are implemented as a set of one or more xpcom (cross-platform com) objects.
...mozilla architectural modules are comprised of groups of related xpcom objects that provide services to and access services from each other through dynamically queryable interfaces.
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What to do and what not to do in Bugzilla
the bug has been reproduced by some people but can't be reproduced by other people.
... the bug reporter reports that they can no longer see the bug and no other people report that they are still seeing the bug.
...the exceptions are bugs in other software which we have to work around and bugs that involve certain core gecko modules.
...And 4 more matches

Command line options
firefox -new-instance -p "another profile" note: not available for windows, see bug 855899.
... firefox -no-remote -p "another profile" note: since firefox 9, this does really mean what its name implies on all platforms, i.e.
...other platforms accept both upper and lower case.
...And 4 more matches

Creating reftest-based unit tests
so, if the effect of complex markup is being tested, put that complex markup into a page and create another page that uses simple markup to achieve the same visual effect.
...if you try to run the full suite, you may experience stalls or other issues.
...the file can include other things, but it does not get very complicated.
...And 4 more matches

Error codes returned by Mozilla APIs
these components usually provide an initialization method, often called init, which must be called before other methods are used.
... ns_error_no_aggregation (0x80040110) ns_error_not_available (0x80040111) an operation could not be completed because some other necessary component or resource was not available.
...while these errors can occur when using the file apis, they can also occur with other components that use files.
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Profile Manager
firefox and other xulrunner applications store user settings and data in special folders, called profiles.
... by default, profile manager will manage firefox profiles, but you can also use it to work with profiles of other xulrunner apps, like thunderbird or seamonkey.
... to use profile manager with an application other than firefox, you need to launch it using the application's name as an argument, for example: profilemanager-bin seamonkey profiles and application versions profile manager manages two different lists: one of user profiles, and the other of application versions that can be used with the profiles.
...And 4 more matches

Midas
otherwise, all selected characters will become bold.
... insertbronreturn true/false selects whether pressing return inside a paragraph creates another paragraph or just inserts a <br> tag.
...otherwise, all selected characters will become italic.
...And 4 more matches

nss tech note5
ck_mechanism_type wrapmech = ckm_des3_ecb; <big>(for example)</big> choose a slot on which to to do the operation pk11slotinfo* slot = pk11_getbestslot(wrapmech, null); or pk11slotinfo* slot = pk11_getinternalkeyslot(); /* always returns int slot, may not be optimal */ <big>regarding the choice of slot and wrapmech, if you know one, you can derive the other.
...to move keys to the desired slot, see section moving a key from one slot to another <big>secstatus s = pk11_wrapsymkey(wrapmech, secparam, wrappingsymkey, tobewrappedsymkey, &wrappedkey);</big> <big><big>transport/store or do whatever with the wrapped key (wrappedkey.data, wrappedkey.len)</big></big> <big><big>unwrapping.
... <big>regarding the choice of slot and wrapmech, if you know one, you can derive the other.
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PKCS11 FAQ
other certificates on the token are also loaded (to allow building certificate chains), but it's not necessary to include the full chain, as long as the full chain is available in the regular certificate database.
... will nss get the user's ca certificate via pkcs #11 and push it into the ca certificate database or is the ca certificate database expected to obtain the ca certificate by some other means?
...all other certificates in the module are loaded into the temporary database with no special trust bits associated with them.
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Python binding for NSS
in other words they can be iterated over, indexed by position, or used as slices.
...this allows other python threads to execute during the time a nss/nspr function is progress in another thread.
... other documentation the doc directory contains other files you may wish to review.
...And 4 more matches

GC Rooting Guide
there are typedefs for js::mutablehandle<t>, the same as for the other templates: template class typedef js::mutablehandle<js::value> js::mutablehandlevalue js::mutablehandle<jsobject*> js::mutablehandleobject js::mutablehandle<jsstring*> js::mutablehandlestring js::mutablehandle<jsscript*> js::mutablehandlescript js::mutablehandle<jsid> js::mutablehandleid js::mutablehandle<t> shoul...
... if (!waserror) *valueout = resultvalue; return waserror; } void otherfunction(jscontext *cx) { js::value value; bool success = maybegetvalue(cx, &value); // ...
... if (!waserror) valueout.set(resultvalue); return waserror; } void otherfunction(jscontext *cx) { js::rootedvalue value(cx); bool success = maybegetvalue(cx, &value); // ...
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Garbage collection
in other words, from the point of view of the rest of the engine, the job of the gc is to allocate cells and automatically collect them.
...(some cells are shared across all compartments in a zone.) an object may not hold a direct pointer to an object in another compartment.
... instead, it must store a wrapper for the other object.
...And 4 more matches

Property cache
(informally: if another property shadows x'.p, the shape of x' will change.) o---->o---->o---->o ^x ^x' ^object.prototype, perhaps (----> indicates the proto relation) scope chain shadowing guarantee — if at time t0 the object x has shape s and a name lookup for p starting at scope chain head x finds p on an object x' of shape s', where x !== x'; and the lookup called no resolve hooks or non-...
...(informally: if another variable or property shadows x'.p, the shape of x' will change.) o this object is x, perhaps a call object.
... ↓ o another call object.
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SpiderMonkey 24
it continues to improve performance over previous spidermonkey releases, with a significantly improved garbage collector, a new jit compilation mode, and other features.
...on some other platforms (sparc, mips), the jit is provided but not supported.
... on all other platforms the jit is simply disabled; javascript code runs in an interpreter, as in previous versions.
...And 4 more matches

A Web PKI x509 certificate primer
one issue that is not commonly known is that the x509 trust graph is not a forest (a bunch of trees where each root is a trusted root) but a cyclic graph, where the same key/issuer can be a root or an intermediate for another root in the browsers key store (when roots create intermediates for each other it is called cross-signing).
...certificates can have other extensions not described on rfc 5280, but that is out of the scope of this document.
... subject alternate name this extension defines what other names (such as dns names) are valid for this certificate.
...And 4 more matches

AT APIs Support
but in the meantime it more up-to-date and contains more details than existed analogues for at-spi and msaa this documentation explains how makers of screen readers, voice dictation packages, onscreen keyboards, magnification software and other assitive technologies can support gecko-based software.
... open komodo - platform for building developer environments miro - a free, open source internet tv and video player any xulrunner application (songbird media player, etc.) extensions to other xul apps (e.g.
... firefox extensions) gecko version for firefox and all other gecko-based products: this documentation applies to up-to-date product builds based on gecko 1.9.2 -- currently not available on official releases.
...And 4 more matches

History Service Design
places core history service (nsinavhistoryservice.idl) is the core of places, every other places service depends on it to correctly work, so it gets always initialized at application startup.
...in case the database has been created for the first time history service will create all tables, indexes and triggers, calling related inittables static methods of other dependant services.
...the same pre-compiled statements approach is used in other dependant services and in autocomplete.
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Places utilities for JavaScript
unfiledbookmarksfolderid other other attributes stored in placesutils.
... return type return true if the node is a folder, false otherwise.
... other other functions that i'm not sure how to file.
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XPCOM array guide
note that this class differs from the other array types by using unsigned indices.
... some other arrays: fallibletarray, autofallibletarray, infallibletarray, autoinfallibletarray, nstobserverarray, nsautotobserverarray.
... otherwise use nsiarray and make liberal use of queryelementat().
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nsIDocShell
instead, retrieve an nsidocshell from a browser or other document container element.
... forcedcharset nsiatom a character set to override the page's default character set while processing; this is tried before using any other character set during page loads.
...docshells are not app tabs unless told otherwise.
...And 4 more matches

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).
...this flag is accompanied by either state_start or state_stop, and it may be combined with other state type flags.
...And 4 more matches

XUL Overlays
when plug-ins, browser extensions, or other applications provide new ui elements to the browser, these elements should be defined in overlay files.
...any number of overlays can be loaded into a master document, and an overlay can also load other overlays.
...loading overlays at runtime firefox 1.5 and other gecko 1.8-based applications also support loading overlays on-the-fly via the document.loadoverlay() function.
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Zombie compartments
│ │ │ ├──3.78 mb (00.76%) ++ js-compartment(https://www.google.de/?gws_rd=ssl) │ │ │ ├──0.51 mb (00.10%) ── style-sheets │ │ │ ├──0.33 mb (00.07%) -- dom │ │ │ │ ├──0.17 mb (00.04%) ── text-nodes │ │ │ │ ├──0.13 mb (00.03%) ── element-nodes │ │ │ │ ├──0.02 mb (00.00%) ── other │ │ │ │ ├──0.01 mb (00.00%) ── orphan-nodes │ │ │ │ └──0.00 mb (00.00%) ── event-targets │ │ │ └──0.00 mb (00.00%) ── property-tables │ │ └───5.93 mb (01.19%) -- js-zone(0x13ffa0000) │ │ ├──1.92 mb (00.39%) ── unused-gc-things │ │ ├──1.28 mb (00.26%) -- lazy-scripts │ │ ...
... first, many sites utilize scripts from other sites to provide advertisements, "like" and "+1" buttons, twitter feeds, etc.
.....) compartment(https://plusone.google.com/_/+1/fastbutton?...) compartment(http://platform.twitter.com/widgets/...utton.html?...) compartment(http://cdn.at.atwola.com/_media/uac/tcode3.html) compartment(https://s-static.ak.fbcdn.net/connec..._proxy.php?...) compartment(http://ads.tw.adsonar.com/adserving/getads.jsp?...) (some of those compartment urls are long and have been truncated.) another thing to beware is each compartment is created for an origin (e.g.
...And 4 more matches

Initialization and Destruction - Plugins
plug-ins consume no resources, other than disk space, if not referenced.
... the other table lists all api calls from the browser to the plug-in.
...however, because np_initialize is called at the end of the initialization process, you can call other methods, such as npn_memalloc and npn_status, from np_initialize.
...And 4 more matches

Accessibility Inspector - Firefox Developer Tools
the accessibility inspector provides a means to access important information exposed to assistive technologies on the current page via the accessibility tree, allowing you to check what's missing or otherwise needs attention.
...this means trying your best to not lock anyone out of accessing information because of any disability they may have, or any other personal circumstances such as the device they are using, the speed of their network connection, or their geographic location or locale.
... roles and other information exposed by browser accessibility apis are presented in a hierarchical structure called the accessibility tree.
...And 4 more matches

Background Tasks API - Web APIs
in the past, there's been no way to do this reliably other than by writing code that's as efficient as possible and by offloading as much work as possible to workers.
... getting the most out of idle callbacks because idle callbacks are intended to give your code a way to cooperate with the event loop to ensure that the system is utilized to its full potential without over-tasking it, resulting in lag or other performance problems, you should be thoughtful about how you go about using them.
...while the browser, your code, and the web in general will continue to run normally if you go over the specified time limit (even if you go way over it), the time restriction is intended to ensure that you leave the system enough time to finish the current pass through the event loop and get on to the next one without causing other code to stutter or animation effects to lag.
...And 4 more matches

Introduction to the DOM - Web APIs
this is expanded upon as needed by other apis that add new features and capabilities to the dom.
... this following javascript will display an alert when the document is loaded (and when the whole dom is available for use): <body onload="window.alert('welcome to my home page!');"> another example.
... this function creates a new h1 element, adds text to that element, and then adds the h1 to the tree for this document: <html> <head> <script> // run this function when the document is loaded window.onload = function() { // create a couple of elements in an otherwise empty html page const heading = document.createelement("h1"); const heading_text = document.createtextnode("big head!"); heading.appendchild(heading_text); document.body.appendchild(heading); } </script> </head> <body> </body> </html> fundamental data types this reference tries to describe the various objects and types in simple terms.
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Using Fetch - Web APIs
fetch provides a better alternative that can be easily used by other technologies such as service workers.
... fetch also provides a single logical place to define other http-related concepts such as cors and extensions to http.
...set-cookie headers from other sites are silently ignored.
...And 4 more matches

Fullscreen API - Web APIs
this makes it possible to present desired content—such as an online game—using the user's entire screen, removing all browser user interface elements and other applications from the screen until full-screen mode is shut off.
...instead, it augments several other interfaces to add the methods, properties, and event handlers needed to provide full-screen functionality.
... methods on the element interface element.requestfullscreen() asks the user agent to place the specified element (and, by extension, its descendants) into full-screen mode, removing all of the browser's ui elements as well as all other applications from the screen.
...And 4 more matches

HTMLMediaElement - Web APIs
htmlmediaelement.mozfragmentend is a double that provides access to the fragment end time if the media element has a fragment uri for currentsrc, otherwise it is equal to the media duration.
...using any other size results in an exception being thrown.
...true if the audio is muted and false otherwise.
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Intersection Observer API - Web APIs
historically, detecting visibility of an element, or the relative visibility of two elements in relation to each other, has been a difficult task for which solutions have been unreliable and prone to causing the browser and the sites the user is accessing to become sluggish.
...intersection information is needed for many reasons, such as: lazy-loading of images or other content as a page is scrolled.
... the intersection observer api lets code register a callback function that is executed whenever an element they wish to monitor enters or exits another element (or the viewport), or when the amount by which the two intersect changes by a requested amount.
...And 4 more matches

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.
...see security for more information on this and other security issues related to using getusermedia().
...the following expresses a preference for 1280x720 camera resolution: { audio: true, video: { width: 1280, height: 720 } } the browser will try to honour this, but may return other resolutions if an exact match is not available, or the user overrides it.
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WebXR Device API - Web APIs
once both eyes' perspectives on the scene have been rendered, the resulting framebuffer is delivered to the webxr device to be presented to the user through their headset or other appropriate display device.
... the equipment may also include an accelerometer, barometer, or other sensors which are used to sense when the user moves through space, rotates their head, or the like.
...one view is offset to the left slightly from the viewer's position, and the other view is offset to the right by the same distance.
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Using the Web Animations API - Web APIs
this means that a keyframe object with three keys will play the middle key 50% of the way through each loop of the animation unless told otherwise.
... when we want to explicitly set a key’s offset from the other keys, we can specify an offset directly in the object, separated from the declaration with a comma.
... the other thing you’ll notice is that it’s iterations, not iteration-count.
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Using XMLHttpRequest - Web APIs
if this argument is true or not specified, the xmlhttprequest is processed asynchronously, otherwise the process is handled synchronously.
...otherwise the progress events will not fire.
... using nothing but xmlhttprequest submitting forms without the formdata api does not require other apis for most use cases.
...And 4 more matches

Grid template areas - CSS: Cascading Style Sheets
late-areas: "hd hd hd hd hd hd hd hd hd" "sd sd sd main main main main main main" "sd sd sd ft ft ft ft ft ft"; } <div class="wrapper"> <div class="header">header</div> <div class="sidebar">sidebar</div> <div class="content">content</div> <div class="footer">footer</div> </div> the value of grid-template-areas must show a complete grid, otherwise it is invalid (and the property is ignored).
...this is a component with space for an image or other media on one side and content on the other.
... </div> </div> displaying the image on the other side of the box we might want to be able to display our box with the image the other way around.
...And 4 more matches

CSS values and units - CSS: Cascading Style Sheets
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 identifier can't be none, unset, initial, or inherit, start with a digit or two dashes, and generally you don't want it to be any other pre-defined css keyword.
...there is never a space or any other characters between a the number and the unit identifier: i.e.
...otherwise, the unit identifier is required, is case insensitive, and must come immediately after the numeric part of the value, with no space in-between.
...And 4 more matches

Using media queries - CSS: Cascading Style Sheets
to target specific media for the <style>, <link>, <source>, and other html elements with the media= attribute.
... not the not operator is used to negate a media query, returning true if the query would otherwise return false.
...each query in a comma-separated list is treated separately from the others.
...And 4 more matches

grid-area - CSS: Cascading Style Sheets
when grid-column-end is omitted, if grid-column-start is a <custom-ident>, grid-column-end is set to that <custom-ident>; otherwise, it is set to auto.
... when grid-row-end is omitted, if grid-row-start is a <custom-ident>, grid-row-end is set to that <custom-ident>; otherwise, it is set to auto.
...otherwise, it is set to auto.
...And 4 more matches

justify-content - CSS: Cascading Style Sheets
retch; /* distribute items evenly stretch 'auto'-sized items to fit the container */ /* overflow alignment */ justify-content: safe center; justify-content: unsafe center; /* global values */ justify-content: inherit; justify-content: initial; justify-content: unset; values start the items are packed flush to each other toward the start edge of the alignment container in the main axis.
... end the items are packed flush to each other toward the end edge of the alignment container in the main axis.
... flex-start the items are packed flush to each other toward the edge of the alignment container depending on the flex container's main-start side.
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Getting Started - Developer guides
then, mozilla, safari, and other browsers followed, implementing an xmlhttprequest object that supported the methods and properties of microsoft's original activex object.
...}; 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.
... keep the method all-capitals as per the http standard, otherwise some browsers (like firefox) might not process the request.
...And 4 more matches

Adding captions and subtitles to HTML5 video - Developer guides
in other articles we looked at how to build a cross browser video player using the htmlmediaelement and window.fullscreen apis, and also at how to style the player.
... no image is used for the captions button, so it is simply styled as: .controls button[data-state="subtitles"] { height:85%; text-indent:0; font-size:16px; font-size:1rem; font-weight:bold; color:#666; background:#000; border-radius:2px; } there are also other css changes that are specific to some extra javascript implementation, but these will be mentioned at the appropriate place below.
... initial setup as with all the other buttons, one of the first things we need to do is store a handle to the subtitles' button: var subtitles = document.getelementbyid('subtitles'); we also initially turn off all subtitles, in case the browser turns any of them on by default: for (var i = 0; i < video.texttracks.length; i++) { video.texttracks[i].mode = 'hidden'; } the video.texttracks property contains an array of all the te...
...And 4 more matches

Constraint validation - Developer guides
in other words, this method sends the form data to the server even if doesn't satisfy the constraints.
... basically, the idea is to trigger javascript on some form field event (like onchange) to calculate whether the constraint is violated, and then to use the method field.setcustomvalidity() to set the result of the validation: an empty string means the constraint is satisfied, and any other string means there is an error and this string is the error message to display to the user.
... constraint combining several fields: postal code validation the postal code format varies from one country to another.
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<a>: The Anchor element - HTML: Hypertext Markup Language
filesystems may forbid other characters in filenames, so browsers will adjust the suggested name if necessary.
...links are not restricted to http-based urls — they can use any url scheme supported by browsers: sections of a page with fragment urls pieces of media files with media fragments telephone numbers with tel: urls email addresses with mailto: urls while web browsers may not support other url schemes, web sites can with registerprotocolhandler() hreflang hints at the human language of the linked url.
... permitted parents any element that accepts phrasing content, or any element that accepts flow content, but not other <a> elements.
...And 4 more matches

<audio>: The Embed Audio element - HTML: Hypertext Markup Language
in a similar manner to the <img> element, we include a path to the media we want to embed inside the src attribute; we can include other attributes to specify information such as whether we want it to autoplay and loop, whether we want to show the browser's default audio controls, etc.
...in other words, it sends the origin: http header without a cookie, x.509 certificate, or performing http basic authentication.
...in other words, it sends the origin: http header with a cookie, a certificate, or performing http basic authentication.
...And 4 more matches

<iframe>: The Inline Frame element - HTML: Hypertext Markup Language
the html inline frame element (<iframe>) represents a nested browsing context, embedding another html page into the current one.
...the browsing context that embeds the others is called the parent browsing context.
... because each browsing context is a complete document environment, every <iframe> in a page requires increased memory and other computing resources.
...And 4 more matches

<img>: The Image Embed element - HTML: Hypertext Markup Language
there are many other attributes to achieve various purposes: referrer/cors control for security and privacy: see crossorigin and referrerpolicy.
...for these reasons and others, provide a useful value for alt whenever possible.
...allowed values: sync decode the image synchronously, for atomic presentation with other content.
...And 4 more matches

<input type="email"> - HTML: Hypertext Markup Language
in other words, the user does not have to enter even one e-mail address when multiple is specified, regardless of the value of required.
...you should also include other explanatory text nearby.
...it is not as semantically useful as other ways to explain your form, and can cause unexpected technical issues with your content.
...And 4 more matches

<tr>: The Table Row element - HTML: Hypertext Markup Language
charobsolete since html5 a domstring which sets the character to align the cells in each of the row's columns on (each row's centering that uses the same character gets aligned with others using the same character .
... table { border: 1px solid black; } th, td { border: 1px solid black; } result row and column spanning now, let's introduce another column that shows the date the user's membership ended, along with a super-heading above the "joined" and "canceled" dates called "membership dates".
... result let's actually look at the output first this time: notice how the heading area here is actually two rows, one with "name", "id", "membership dates", and "balance" headings, and the other with "joined" and "canceled", which are sub-headings below "membership dates".
...And 4 more matches

<video>: The Video Embed element - HTML: Hypertext Markup Language
in a similar manner to the <img> element, we include a path to the media we want to display inside the src attribute; we can include other attributes to specify information such as video width and height, whether we want it to autoplay and loop, whether we want to show the browser's default video controls, etc.
... attributes like all other html elements, this element supports the global attributes.
... autopictureinpicture a boolean attribute which if true indicates that the element should automatically toggle picture-in-picture mode when the user switches back and forth between this document and another document or application.
...And 4 more matches

An overview of HTTP - HTTP
this role is primarily performed by the web browser; other possibilities are programs used by engineers and web developers to debug their applications.
...a server appears as only a single machine virtually: this is because it may actually be a collection of servers, sharing the load (load balancing) or a complex piece of software interrogating other computers (like cache, a db server, or e-commerce servers), totally or partially generating the document on demand.
... relaxing the origin constraint to prevent snooping and other privacy invasions, web browsers enforce strict separation between web sites.
...And 4 more matches

JavaScript data types and data structures - JavaScript
programming languages all have built-in data structures, but these often differ from one language to another.
...these can be used to build other data structures.
... wherever possible, comparisons with other languages are drawn.
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Numbers and dates - JavaScript
see also javascript data types and structures for context with other primitive types in javascript.
... decimal numbers 1234567890 42 // caution when using leading zeros: 0888 // 888 parsed as decimal 0777 // parsed as octal in non-strict mode (511 in decimal) note that decimal literals can start with a zero (0) followed by another decimal digit, but if every digit after the leading 0 is smaller than 8, the number gets parsed as an octal number.
...these include trigonometric, logarithmic, exponential, and other functions.
...And 4 more matches

Regular expression syntax cheatsheet - JavaScript
\s matches a single white space character, including space, tab, form feed, line feed, and other unicode spaces.
... \s matches a single character other than white space.
...do not follow this with another digit.
...And 4 more matches

Memory Management - JavaScript
allocation in javascript value initialization in order to not bother the programmer with allocations, javascript will automatically allocate memory when values are initially declared.
...within the context of memory management, an object is said to reference another object if the former has access to the latter (either implicitly or explicitly).
...this algorithm reduces the problem from determining whether or not an object is still needed to determining if an object still has any other objects referencing it.
...And 4 more matches

this - JavaScript
a function's this keyword behaves a little differently in javascript compared to other languages.
...the same applies to arrow functions created inside other functions: their this remains that of the enclosing lexical context.
...console.log(fn2()() == window); // true in the above, the function (call it anonymous function a) assigned to obj.bar returns another function (call it anonymous function b) that is created as an arrow function.
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JavaScript
this section is dedicated to the javascript language itself, and not the parts that are specific to web pages or other host environments.
...and other countries.
... javascript guide javascript guide a much more detailed guide to the javascript language, aimed at those with previous programming experience either in javascript or another language.
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OpenSearch description format
the opensearch description format lets a website describe a search engine for itself, so that a browser or other client application can use that search engine.
...(see reference material for links to other browsers' documentation.) firefox also supports additional features not in the opensearch standard, such as search suggestions and the <searchform> element.
...xmlns:moz="http://www.mozilla.org/2006/browser/search/"> <shortname>[snk]</shortname> <description>[search engine full name and summary]</description> <inputencoding>[utf-8]</inputencoding> <image width="16" height="16" type="image/x-icon">[https://example.com/favicon.ico]</image> <url type="text/html" template="[searchurl]"> <param name="[key name]" value="{searchterms}"/> <!-- other params if you need them… --> <param name="[other key name]" value="[parameter value]"/> </url> <url type="application/x-suggestions+json" template="[suggestionurl]"/> <moz:searchform>[https://example.com/search]</moz:searchform> </opensearchdescription> shortname a short name for the search engine.
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Gradients in SVG - SVG: Scalable Vector Graphics
you must give the gradient an id attribute; otherwise it can't be referenced by other elements inside the file.
... the <lineargradient> element also takes several other attributes, which specify the size and appearance of the gradient.
...when it is used, attributes and stops from one gradient can be included on another.
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WebAssembly Concepts - WebAssembly
like other web code, it will enforce the browser's same-origin and permissions policies.
... don't break the web — webassembly is designed so that it plays nicely with other web technologies and maintains backwards compatibility.
...we have run into performance problems, however, when trying to use javascript for more intensive use cases like 3d games, virtual and augmented reality, computer vision, image/video editing, and a number of other domains that demand native performance (see webassembly use cases for more ideas).
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Exported WebAssembly functions - WebAssembly
an example let's look at an example to clear things up (you can find this on github as table-set.html; see it running live also, and check out the wasm text representation): var othertable = new webassembly.table({ element: "anyfunc", initial: 2 }); webassembly.instantiatestreaming(fetch('table.wasm')) .then(obj => { var tbl = obj.instance.exports.tbl; console.log(tbl.get(0)()); // 13 console.log(tbl.get(1)()); // 42 othertable.set(0,tbl.get(0)); othertable.set(1,tbl.get(1)); console.log(othertable.get(0)()); console.log(othertable.get(1)()); }); here we crea...
...te a table (othertable) from javascript using the webassembly.table constructor, then we load table.wasm into our page using the webassembly.instantiatestreaming() method.
...next, we use set() to make the othertable table contain references to the same functions as the tbl table.
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Private Properties - Archive of obsolete content
unlike other languages, javascript does not have native support for private properties.
...this article discusses two common techniques: one using prefixes, the other closures.
... using closures another common technique, is to define private properties as variables and their getter and setter functions as a closure over these variables: function point(_x, _y) { this.getx = function () { return _x; }; this.setx = function (x) { _x = x; }; this.gety = function () { return _y; }; this.sety = function (y) { _y = y; }; } note that ...
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/loader - Archive of obsolete content
n setup looks like this: let { loader } = require('toolkit/loader'); let loader = loader({ paths: { // resolve all modules starting with `toolkit/` as follows: // toolkit/foo -> resource://gre/modules/commonjs/toolkit/foo.js // toolkit/foo/bar -> resource://gre/modules/commonjs/toolkit/foo/bar.js 'toolkit/': 'resource://gre/modules/commonjs/toolkit/', // resolve all other non-relative module requirements as follows: // devtools/gcli -> resource:///modules/devtools/gcli.js // panel -> resource:///modules/panel.js '': 'resource:///modules/', } }) all relative url require() statements (those that start with ".") are first resolved relative to the requirer module id and the result of it is then resolved using the paths option.
...ropriate mapping for it: let { loader } = require('toolkit/loader'); let loader = loader({ paths: { // resolve all modules starting with `toolkit/` as follows: // toolkit/foo -> resource://gre/modules/commonjs/toolkit/foo.js // toolkit/foo/bar -> resource://gre/modules/commonjs/toolkit/foo/bar.js 'toolkit/': 'resource://gre/modules/commonjs/toolkit/', // resolev all other non-relative module requirements as follows: // devtools/gcli -> resource:///modules/devtools/gcli.js // panel -> resource:///modules/panel.js '': 'resource:///modules/', // allow relative urls and resolve them to add-on root: // ./main -> resource://my-addon/root/main.js './': 'resource://my-addon/root/' } }); the order of keys in paths is ir...
...all other modules will be loaded by this module or its dependencies: let { main, loader } = require('toolkit/loader'); let loader = loader(options); let program = main(loader, './main'); a module can find out whether it was loaded as main: if (require.main === module) main(); it is possible to load other modules before a main one, but it's inherently harder to do.
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remote/parent - Archive of obsolete content
usage in multiprocess firefox: the browser ui runs in one process, sometimes called the chrome process or the parent process web content runs in one or more other processes, sometimes called content processes or remote processes or child processes.
...these sdk modules have higher privileges than content scripts, and have their own module loader so they can load other sdk modules.
...multiprocess applications can have other remote processes where untrusted content like webpages are loaded.
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ui/frame - Archive of obsolete content
if you know the target uri, you should use it, as this is more secure: it prevents another window from intercepting messages that were intended for someone else.
...var { frame } = require("sdk/ui/frame"); var { toolbar } = require("sdk/ui/toolbar"); var frame = new frame({ url: "./city-info.html", onmessage: function(e) { // message only the frame that pinged us e.source.postmessage("pong", e.origin); } }); var toolbar = toolbar({ name: "ping-pong", title: "ping pong", items: [frame] }); this does not have to be the message event: the other events frame can emit: attach, load and ready, also provide access to source and origin.
...n this case you should pass the frame's url property as the targetorigin: frame.postmessage("ping", frame.url); on(event, listener) assign a listener to a frame event: var { frame } = require("sdk/ui/frame"); var frame = new frame({ url: "./frame.html" }); frame.on("message", pong) function pong(e) { if (e.data == "ping") { // message only the sender, and not any frames attached to other browser windows e.source.postmessage("pong", "*"); } } parameters event : string the name of the event to listen to.
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Install Manifests - Archive of obsolete content
required property reference your install manifest must specify these properties correctly otherwise your add-on may not install.
...firefox 1.5 has checking to ensure that your id falls into one format or the other and will refuse to install add-ons that have malformed ids.
... 2 extensions 4 themes 8 locale 32 multiple item package 64 spell check dictionary 128 telemetry experiment 256 webextension experiment examples <em:type>2</em:type> this property was added for firefox 1.5, and is only required for add-on types other than extensions and themes.
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Adding menus and submenus - Archive of obsolete content
the menubar element should be a child of a toolbox element because it is treated like another toolbar on systems other than mac os x.
... mac os x treats menus in a very different way than other systems.
... another example of a menu like this is the view > sidebars menu.
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Appendix B: Install and Uninstall Scripts - Archive of obsolete content
a few others require cleanup code to be run after the add-on is uninstalled.
...you should also change the preference value before you run any other first run code.
...if an add-on is uninstalled and later installed again, it might be desirable for preferences and other settings to be kept.
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Appendix E: DOM Building and Insertion (HTML & XUL) - Archive of obsolete content
onclick: function (event) { alert(event.target.href); } }, text], ["span", { class: "stuff" }, "stuff"]]], document, nodes)); alert(nodes.link); function addentrytopopup(menupopup, doc, chromewindow) { var newitem = doc.createelement("menuitem"); newitem.setattribute("value", "testvalue"); newitem.setattribute("label", "another popup menu item"); menupopup.appendchild(newitem); }; var jsontemplatebtn = ["xul:toolbarbutton", { id: "mytestbutton", class: "toolbarbutton-1", type: "menu", label: "test button label", tooltiptext: "test button tooltip", removable: true, key: "mytestbutton123" }, [ "menupopup", ...
... toolbox = doc.getelementbyid("navigator-toolbox"); var palette = toolbox.palette; var domfragment = jsontodom(jsontemplatebtn, document, capturednodes); palette.appendchild(domfragment); alert("capturednodes contains any created nodes that have optionally been captured (for later convenient javascript access) by giving them a 'key' attribute; for example: " + capturednodes.mytestbutton123); another example this here is another example of using jsontodom but in the html scope, a complex form is created with ease.
...in these cases, multiple attributes should be used, one for each variable: function clickify(elem, address) { elem.setattribute("href", address); elem.setattribute("onclick", "openwindow(this.getattribute('href'))"); } escaping functions when the code fragment in question is not an event handler attribute and there is no feasible way to pass the data through other means, they must be escaped with functions such as uneval, string.quote, json.stringify, or number.
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Handling Preferences - Archive of obsolete content
this file is never written to by firefox, but you may wish to set preferences manually in this file to override other settings.
... firefox exposes its most common high-level preferences through the preferences window and other parts of its ui.
... in reality there are thousands of other preferences firefox handles that are not readily available to the user.
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Mozilla Documentation Roadmap - Archive of obsolete content
it encompasses firefox, other mozilla products, javascript, css, xul, web and extension development guidelines, accessibility, usability, best practices...
...it brings together the feeds of most mozilla employees, as well as several other members of the mozilla community.
...there are several help and development channels where you can discuss problems and other topics in real time with the people that have the answers.
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Same-origin policy for file: URIs - Archive of obsolete content
in other words, any html file on your local disk can read any other file on your local disk.
... starting in gecko 1.9, files are allowed to read only certain other files.
... specifically, a file can read another file only if the parent directory of the originating file is an ancestor directory of the target file.
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Making it into a static overlay - Archive of obsolete content
now that we have a working mozilla extension that shows tinderbox status, we need to make it distributable to other users.
...a xul overlay is a xul file containing elements to be inserted into another xul file when the other xul file is rendered into an application interface.
...overlays provide a way to break up a large xul file into several different files (one that describes the overall structure of an application window and the others to implement specific portions of the window) to improve code readability, maintainability, and extensability.
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Document Loading - From Load Start to Finding a Handler - Archive of obsolete content
dramatis personae this document focuses on the interaction of three classes with each other, but other mozilla components are also involved.
...some facilities are provided for starting loads, canceling loads, and other such micromanagement.
...otherwise, dispatchcontent goes through a three-step process to try to find the correct listener.
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Using microformats - Archive of obsolete content
tag used to add tags to other microformats.
... showhidden if true, hidden microformats are added; otherwise they're left out.
... debug specify true if debug mode is in use; otherwise, specify false.
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Creating a Help Content Pack - Archive of obsolete content
this is still very much a work in progress, tho, and i need to complete the rest of it soon (where "complete" means "use what's there that's good, build on the stuff that's not as good, and add other useful information as necessary".
...the data source specified by toc will always be displayed, while the other data sources may only be available by searching through the loaded content pack.
...to have the help viewer search through these additional data sources, define another rdf:li element like so: <rdf:li> <rdf:description nc:panelid="search" nc:datasources="" nc:emptysearchtext="[no matching items found.]" nc:emptysearchlink="chrome://foo/locale/bar.html"/> </rdf:li> nc:panelid should be set to searc...
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How to Write and Land Nanojit Patches - Archive of obsolete content
once the patch seems ready, copy it to the other two repositories and test it.
... [njn: it's possible that the other tm/tr public repo hasn't been updated from nanojit-central sufficiently recently, in which case the patch won't apply cleanly.
... if it's major you'll need to do a private update of that other repo in order to test.
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Space Manager High Level Design - Archive of obsolete content
when elements are floated to the left or right in a layout, they take up space and influence where other elements can be placed.
...this information is used by block layout to correctly compute where other floated elements should be placed, and how much space is available to normal in-flow elements that flow around the floated bits.
... the space manager works in concert with several other classes to do its job.
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Multiple Queries - Archive of obsolete content
however, you will probably notice that the one photo that matches the first query has appeared differently that the others.
... in fact, the content for this photo is that of the first query with the button, whereas the content for the other photos are that of the second query with the normal images.
...it doesn't matter whether other variables are the same or not.
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Static Content - Archive of obsolete content
one interesting thing about this example is that only one menupopup will be created, even though there are two in the code, one outside the template and another one inside the action body.
...instead of creating another menupopup, the builder uses the existing one.
...if you were to change the static content to be some other element besides a menupopup, it won't match, so the builder will create a new one when handling the action.
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Textbox (XPFE autocomplete) - Archive of obsolete content
the following values are possible, although custom components may be installed which add others.
...if the user types another character, the timer resets.
...be aware, however, that some elements, such as textbox will display the value visually, so in order to merely associate data with an element, you could 1) use another attribute like "value2" or "data-myatt" (as in the html5 draft), as xul does not require validation (less future-proof); 2) use setattributens() to put custom attributes in a non-xul namespace (serializable and future-proof); 3) use setuserdata() (future-proof and clean, but not easily serializable).
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The Joy of XUL - Archive of obsolete content
easy customization, localization, or branding another highly practical benefit of the separation that xul provides among application logic, presentation, and language text is the ease of customizing for different customers or groups of users.
...while such changes are extensive and affect most (if not all) of the application, they are also isolated from one another, enabling the core xul definition and application logic to be shared among all of the custom versions.
... supporting technologies there are number of other technologies introduced by mozilla that complement xul for building cross platform web applications.
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Box Objects - Archive of obsolete content
some of these subtypes, such as the stack or listbox are needed for more complex layouts than the basic box, while others such as the button are used only to add extra mouse and key event handling.
... the layout object associated with an element can be removed and a completely different type of object created just by changing the css display property, among others.
...the others have functions which are more easily accessible by methods mapped directly onto the element, since those types are generally only used with one particular element.
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Broadcasters and Observers - Archive of obsolete content
the technique also works for other attributes as well.
...we saw something like this in a previous section where the disabled attribute was adjusted once and propagated to other elements.
...you should always use an id attribute so that it can be referred to by other elements.
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Grids - Archive of obsolete content
if you wanted one particular cell to contain multiple elements, you can use a nested hbox or other box element.
...you could add additional nested boxes or even another grid inside a single cell.
... if you resize the window of the last example, you will see that the textboxes resize, but no other elements do.
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RDF Datasources - Archive of obsolete content
other mozilla datasources mozilla provides a number of other built-in datasources.
...late> <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 datasources available with mozilla.
...instead, only the files and directories that the tree element (or other elements) will need to display at a given time will be determined.
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The Box Model - Archive of obsolete content
added elements will be placed underneath each other in a column.
...login prompt example you can add as many elements as you want inside a box, including other boxes.
...aligning textboxes if you look closely at the image of the login dialog, you can see that the two textboxes are not aligned with each other horizontally.
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Using Remote XUL - Archive of obsolete content
this isn't a problem inside an organization that uses mozilla-based browsers exclusively, but for other sites you may need to provide another form of navigation as well.
...the window element is the root (outermost) element in a xul document and encompasses all other elements.
... [optionally show what this looks like] the value of the flex attribute determines the extent to which the element will stretch relative to other flexible elements.
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XUL accessibility tool - Archive of obsolete content
(aaronandy) enable tabs, context menu, and other browser extras in report window.
... possible false positives in some of the other tests processing is slower than we would like.
... add usability, i18n, security and other considerations to xul a11y guidelines -- make them more general sprinkle the a11y techniques throughout the turorial and reference.
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XML - Archive of obsolete content
xml is a language for creating other languages.
...an actual memo using the memoml to represent itself might look like this: <memo> <from>ian oeschger</from> <to>steve rudman</to> <body>i think the first draft of the guide is done!</body> </memo> note how the memo element -- the root element in our brief definition, ordeclaration, above -- surrounds the other three elements.
...xul is little beyond the set of tags used to define interface widgets, the relationship between them, or grammar, and some built-in flexibility for using extra resources like images, html elements, and other standards-based technologies.
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button - Archive of obsolete content
event handlers can be used to trap mouse, keyboard and other events.
... normal for scales, the scale's values are ordered from left to right (for horizontal scales) or from top to bottom (for vertical scales) for other elements, the elements are placed left to right or top to bottom in the order they appear in the xul code.
...for other elements, they are placed right to left or bottom to top.
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richlistbox - Archive of obsolete content
be aware, however, that some elements, such as textbox will display the value visually, so in order to merely associate data with an element, you could 1) use another attribute like "value2" or "data-myatt" (as in the html5 draft), as xul does not require validation (less future-proof); 2) use setattributens() to put custom attributes in a non-xul namespace (serializable and future-proof); 3) use setuserdata() (future-proof and clean, but not easily serializable).
...pnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata additemtoselection( item ) return type: no return value selects the given item, without deselecting any other items that are already selected.
... removeitemfromselection( item ) return type: no return value deselects the specified item without deselecting other items.
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tree - Archive of obsolete content
unlike other elements, the data to display inside the tree is not specified using tags, but is determined from a view object.
...if the element contains more than this number of rows, a scrollbar will appear which the user can use to scroll to the other rows.
...otherwise, the entire row will be highlighted.
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nsIContentPolicy - Archive of obsolete content
t, in acstring amimetypeguess, in nsisupports aextra, in nsiprincipal arequestprincipal); short shouldprocess(in unsigned long acontenttype, in nsiuri acontentlocation, in nsiuri arequestorigin, in nsisupports acontext, in acstring amimetype, in nsisupports aextra, in nsiprincipal arequestprincipal); constants content types constant value description type_other 1 indicates content whose type is unknown, or is not interesting outside a limited use case.
... in general, you should try not to use this type unless none of the others is a fit.
... type_subdocument 7 indicates a document contained within another document (for example, <iframe> and <frame> elements).
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Gecko Compatibility Handbook - Archive of obsolete content
because of gecko's cross-platform nature, functionality is generally very much the same on different platforms unlike internet explorer for mac and ie for windows, which are very different programs and so may behave quite differently from each other.
... problem: site certified on netscape 6.x looks incorrect in other browsers if your site is already gecko-compatible, try switching back to a netscape 6 user-agent string.
... symptom possible problem solution site works correctly in netscape 6.x but not netscape 7.x or other browsers based upon gecko.
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NPClass - Archive of obsolete content
called by npn_createobject() if non-null, otherwise the browser calls malloc().
...returns true if the method exists, otherwise returns false.
...returns true if the specified property exists, otherwise returns false.
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Building a Theme - Archive of obsolete content
other tutorials exist for building themes for earlier versions of firefox.
...inside your new theme folder, create two new empty text files, one called chrome.manifest and the other called install.rdf.
...it contains several folders, modules, jssubloader and others.
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Index - Game development
the concern is mostly with switching to another option.
...as with any other 3d library it provides built-in functions to help you implement common 3d functionality more quickly.
...fragment shaders compute the renderings of a shape's colors and other attributes.
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Building up a basic demo with Three.js - Game development
three.js, as with any other 3d library, provides built-in helper functions to help you implement common 3d functionality more quickly.
...we are not trying to say it is better than any other webgl library available, and you should feel free to try another library, such as copperlicht, glge, or playcanvas.
...there are a few different renderers: webgl is the default, and others you can use are canvas, svg, css, and dom.
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Efficient animation for web games - Game development
though some browsers make some effort for other properties to be animated quickly, these are pretty much the only ones semi-guaranteed to be fast across all browsers.
... something to be careful of is that overflow may end up causing re-layout, or other expensive calculations.
... remember that when you do drawing with requestanimationframe (and in general), you may be blocking the browser from updating other things.
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