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HTMLImageElement.crossOrigin - Web APIs
permitted values are: anonymous requests by the <img> element have their mode set to cors and their credentials mode set to same-origin. this means that cors is enabled and credentials are sent if the image is fetched from the same origin from which the document was loaded. ...
... permitted values are: anonymous requests by the <img> element have their mode set to cors and their credentials mode set to same-origin. this means that cors is enabled and credentials are sent if the image is fetched from the same origin from which the document was loaded. ...
...to cors and their credentials mode set to same-origin. this means that cors is enabled and credentials are sent if the image is fetched from the same origin from which the document was loaded. use-credentials requests by the htmlimageelement will use the cors mode and the include credentials mode; all image requests by the element will use cors, regardless of what domain the fetch is from. ...
...And 4 more matches
HTML attribute: crossorigin - HTML: Hypertext Markup Language
these attributes are enumerated, and have the following possible values: keyword description anonymous cors requests for this element will have the credentials flag set to 'same-origin'. use-credentials cors requests for this element will have the credentials flag set to 'include'. ...
... these attributes are enumerated, and have the following possible values: keyword description anonymous cors requests for this element will have the credentials flag set to 'same-origin'. use-credentials cors requests for this element will have the credentials flag set to 'include'. ...
...s attribute. these attributes are enumerated, and have the following possible values: keyword description anonymous cors requests for this element will have the credentials flag set to 'same-origin'. use-credentials cors requests for this element will have the credentials flag set to 'include'. "" setting the attribute name to an empty value, like
crossorigin or
crossorigin="", is the same as anonymous. by default (that is, when the attribute is not specified), cors is not used at all. the "anonymous" keyword means that there will be no exchange of user credentials via cookies, client-side ssl certificates or http authentication as described in the terminology section of the cors specification, unless it is in the same origin. an invalid keywo...
...And 3 more matches
HTMLMediaElement.crossOrigin - Web APIs
the htmlmediaelement.
crossorigin property is the cors setting for this image element. see cors settings attributes for details. specifications specification status comment html living standardthe definition of 'htmlmediaelement.
crossorigin' in that specification. living standard no change from html5 html5the definition of 'htmlmediaelement.
crossorigin' in that specification. recommendation initial definition ...
WindowOrWorkerGlobalScope.crossOriginIsolated - Web APIs
the
crossoriginisolated read-only property of the windoworworkerglobalscope interface returns a boolean value that indicates whether a sharedarraybuffer can be sent via a window.postmessage() call. this value is dependant on any cross-origin-opener-policy and cross-origin-embedder-policy headers present in the response. syntax var my
crossoriginisolated = self.
crossoriginisolated; // or just
crossoriginisolated value a boolean value examples if(
crossoriginisolated) { // post sharedarraybuffer } else { // do something else } specifications specification status comment html living standardthe definition of '
crossoriginisolated' in that specification. living standard initial definition. ...
Allowing cross-origin use of images and canvas - HTML: Hypertext Markup Language
security and tainted canvases because the pixels in a canvas's bitmap can come from a variety of sources, including images or videos retrieved from other hosts, it's inevitable that security problems may arise. as soon as you draw into a canvas any data that was loaded from another origin without cors approval, the canvas becomes tainted. ...
..., ".png", ".svg", ".svgz", and ".webp") to be accessed cross-origin from anywhere on the internet. implementing the save feature now that the server has been configured to allow retrieval of the images cross-origin, we can write the code that allows the user to save them to local local storage, just as if they were being served from the same domain the code is running on. the key is to use the
crossorigin attribute by setting
crossorigin on the htmlimageelement into which the image will be loaded. this tells the browser to request cross-origin access when trying to download the image data. starting the download the code that starts the download (say, when the user clicks a "download" button), looks like this: function startdownload() { let imageurl = "https://cdn.glitch.com/4c9ebeb9-8b9a-4adc...
...he browser to request cross-origin access when trying to download the image data. ...
...an event listener is added for the load event being fired on the image element, which means the image data has been received. finally, the image's src attribute is set to the url of the image to download; this triggers the download to begin. ...
<img>: The Image Embed element - HTML: Hypertext Markup Language
but is incredibly useful for accessibility — screen readers read this description out to their users so they know what the image means. alt text is also displayed on the page if the image can't be loaded for some reason: for example, network errors, content blocking, or linkrot. there are many other attributes to achieve various purposes: referrer/cors control for security and privacy: see
crossorigin and referrerpolicy. use both width and height to set the intrinsic size of the image, allowing it to take up space before it loads, to mitigate content layout shifts. responsive image hints with sizes and srcset (see also the <picture> element and our responsive images tutorial). supported image formats the html standard doesn't list what image formats to support, so each user agent supports...
...pty string (alt="") indicates that this image is not a key part of the content (it’s decoration or a tracking pixel), and that non-visual browsers may omit it from rendering. visual browsers will also hide the broken image icon if the alt is empty and the image failed to display. this attribute is also used when copying and pasting the image to text, or saving a linked image to a bookmark. ...
...he alt is empty and the image failed to display. this attribute is also used when copying and pasting the image to text, or saving a linked image to a bookmark.
crossorigin indicates if the fetching of the image must be done using a cors request. image data from a cors-enabled image returned from a cors request can be reused in the <canvas> element without being marked "tainted". if the
crossorigin attribute is not specified, then a non-cors request is sent (without the origin request header), and the browser marks the image as tainted and restricts access to its image data, preventing its usage in <canvas> elements. ...
...s request. image data from a cors-enabled image returned from a cors request can be reused in the <canvas> element without being marked "tainted". if the
crossorigin attribute is not specified, then a non-cors request is sent (without the origin request header), and the browser marks the image as tainted and restricts access to its image data, preventing its usage in <canvas> elements. ...
<link>: The External Resource Link element - HTML: Hypertext Markup Language
will then only be loaded if the media condition is true. for example: <link href="print.css" rel="stylesheet" media="print"> <link href="mobile.css" rel="stylesheet" media="screen and (max-width: 600px)"> some interesting new performance and security features have been added to the <link> element too. take this example: <link rel="preload" href="myfont.woff2" as="font" type="font/woff2"
crossorigin="anonymous"> a rel value of preload indicates that the browser should preload this resource (see preloading content with rel="preload" for more details), with the as attribute indicating the specific class of content being fetched. the
crossorigin attribute indicates whether the resource should be fetched with a cors request. other usage notes: a <link> element can occur either in the <head>...
...request prioritization. the table below lists the valid values for this attribute and the elements or resources they apply to. value applies to audio <audio> elements document <iframe> and <frame> elements embed <embed> elements fetch fetch, xhr this value also requires <link> to contain the
crossorigin attribute. font css @font-face image <img> and <picture> elements with srcset or imageset attributes, svg <image> elements, css *-image rules object <object> elements script <script> elements, worker importscripts style <link rel=stylesheet> elements, css @import track <track> elements ...
...cors-enabled images can be reused in the <canvas> element without being tainted. the allowed values are: anonymous a cross-origin request (i.e. with an origin http header) is performed, but no credential is sent (i.e. no cookie, x.509 certificate, or http basic authentication). if the server does not ...
... html 4.01 specificationthe definition of '<link>' in that specification. recommendation ...
Cross-Origin-Embedder-Policy - HTTP
orp directives unsafe-none this is the default value. allows the document to fetch cross-origin resources without giving explicit permission through the cors protocol or the cross-origin-resource-policy header. require-corp a document can only load resources from the same origin, or resources explicitly marked as loadable from another origin. if a cross origin resource supports cors, the
crossorigin attribute or the cross-origin-resource-policy header must be used to load it without being blocked by coep. examples certain features depend on cross-origin isolation you can only access certain features like sharedarraybuffer objects or performance.now() with unthrottled timers, if your document has a coep header with the value require-corp value set. cross-origin-embedder-policy: require-c...
...like sharedarraybuffer objects or performance.now() with unthrottled timers, if your document has a coep header with the value require-corp value set. cross-origin-embedder-policy: require-corp cross-origin-opener-policy: same-origin see also the cross-origin-opener-policy header which you'll need to set as well. ...
..., if your document has a coep header with the value require-corp value set. cross-origin-embedder-policy: require-corp cross-origin-opener-policy: same-origin see also the cross-origin-opener-policy header which you'll need to set as well. ...
...d worker contexts: if (
crossoriginisolated) { // post sharedarraybuffer } else { // do something else } avoiding coep blockage with cors if you enable coep using require-corp and have a cross origin resource that needs to be loaded, it needs to support cors and you need to explicitly mark the resource as loadable from another origin to avoid blockage from coep. for example, you can use the
crossorigin attribute for this image from a third-party site: <img src="https://thirdparty.com/img.png"
crossorigin> specifications specification html living standardthe definition of 'cross-origin-embedder-policy header' in that specification. ...
Components.utils.exportFunction
assign the return value of exportfunction() to an object in the target scope. allowcallbacks: deprecated/redundant from firefox 34. this option allows the exported function to accept callbacks as arguments. boolean, defaulting to false. this option is new in firefox 33. from firefox 34 onwards this option has no effect: the exported function is always able to accept callbacks as arguments. allow
crossoriginarguments: do not check that arguments to the exported function are subsumed by the caller: this allows the caller to pass objects with a different origin into the exported function, which can then use its privileged status to make cross-origin requests with them. boolean, defaulting to false. this option is new in firefox 34. returns the placeholder function which has been created in the targe...
...ecking when the exported function is called each argument, including this, is checked to make sure that the caller subsumes that argument. this prevents passing cross-origin objects (like window or location) to privileged functions, since the privileged code will have full access to those objects and might unintentionally do something dangerous. this provision can be overridden by passing { allow
crossoriginarguments: true } to exportfunction. example export to global scope this add-on script defines a function, then exports it to a content window: // addon-script.js var salutation = "hello "; function greetme(user) { return salutation + user; } components.utils.exportfunction(greetme, contentwindow, {defineas: "foo"}); instead of using defineas, the script can assign the result of exportf...
nsIXPConnect
cription exceptions thrown missing exception missing description native code only!getwrapperforobject obsolete since gecko 2.0 (firefox 4 / thunderbird 3.3 / seamonkey 2.1)this feature is obsolete. although it may still work in some browsers, its use is discouraged since it could be removed at any time. try to avoid using it. returns an xpcnativewrapper, xpcsafejsobjectwrapper, or xpc
crossoriginwrapper for the given object based on the principal, scope, and filename flags that are passed in. note: in c++, the out jsval parameter must already be a strong gc root. jsval getwrapperforobject( in jscontextptr ajscontext, in jsobjectptr aobject, in jsobjectptr ascope, in nsiprincipal aprincipal, in unsigned long afilenameflags ); parameters ajscontext a jscontext. aobject t...
... are passed in. note: in c++, the out jsval parameter must already be a strong gc root. jsval getwrapperforobject( in jscontextptr ajscontext, in jsobjectptr aobject, in jsobjectptr ascope, in nsiprincipal aprincipal, in unsigned long afilenameflags ); parameters ajscontext a jscontext. aobject the object to wrap. ascope the scope to be used in the event that we create an xpc
crossoriginwrapper. can be null. aprincipal the principal that should be used for the wrapper. if this parameter is given then afilenameflags will not be calculated and will be assumed to be 0 unless another value is given. if this parameter is null then afilenameflags will be calculated and the value of that argument will be ignored. afilenameflags the filename flags from the script that will use this w...
WebIDL bindings
ion can be added to interface methods or interfaces. adding this to an interface causes a warning to be issued the first time the object is constructed, or any static method on the object is invoked. the complete list of valid deprecation tags is maintained in nsdeprecatedoperationlist.h. each new tag requires that a localized string be defined, containing the deprecation message to display. ...
...hod on the object is invoked. the complete list of valid deprecation tags is maintained in nsdeprecatedoperationlist.h. each new tag requires that a localized string be defined, containing the deprecation message to display. [
crossoriginreadable] used to flag an attribute that, when read, will not have the same-origin constraint tested: it can be read from a context with a different origin. [
crossoriginwrite] used to flag an attribute that, when written, will not have the same-origin constraint tested: it can be written from a context with a different origin. [
crossorigincallable] used to flag a method that, when called, will not have the same-origin constraint tested: it can be called from a context with a different origin. [securecontext] we implement the standard extended attribute with ...
HTMLImageElement - Web APIs
mstring that reflects the alt html attribute, thus indicating the alternate fallback content to be displayed if the image has not been loaded. htmlimageelement.complete read only returns a boolean that is true if the browser has finished fetching the image, whether successful or not. that means this value is also true if the image has no src value indicating an image to load. htmlimageelement.
crossorigin a domstring specifying the cors setting for this image element. see cors settings attributes for further details. this may be null if cors is not used. htmlimageelement.currentsrc read only returns a usvstring representing the url from which the currently displayed image was loaded. this may change as the image is adjusted due to changing conditions, as directed by any media queries which are...
...rc and sizes. html5the definition of 'htmlimageelement' in that specification. recommendation a constructor (with 2 optional parameters) has been added. the following properties are now obsolete: name, border, align, hspace, vspace, and longdesc. the following properties are now unsigned long, instead of long: height, and width. the following properties have been added:
crossorigin, naturalwidth, naturalheight, and complete. document object model (dom) level 2 html specificationthe definition of 'htmlimgelement' in that specification. obsolete the lowsrc property has been removed. the following properties are now long, instead of domstring: height, width, hspace, and vspace. document object model (dom) level 1 specificationthe definition of 'html...
HTMLLinkElement - Web APIs
nsolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">htmllinkelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties inherits properties from its parent, htmlelement, and linkstyle. htmllinkelement.as is a domstring representing the type of content being loaded by the html link. htmllinkelement.
crossorigin is a domstring that corresponds to the cors setting for this link element. see cors settings attributes for details. htmllinkelement.disabled is a boolean which represents whether the link is disabled; currently only used with style sheet links. htmllinkelement.href is a domstring representing the uri for the target resource. htmllinkelement.hreflang is a domstring representing the langu...
...ement, and linkstyle. specifications specification status comment preload candidate recommendation defines <link rel="preload">, and the as property. note that currently firefox only supports preloading of cacheable resources. html living standardthe definition of 'htmllinkelement' in that specification. living standard adds the following properties:
crossorigin, referrerpolicy, and as. html 5.1the definition of 'htmllinkelement' in that specification. recommendation html5the definition of 'htmllinkelement' in that specification. recommendation the following properties are now obsolete: charset, rev, and shape. the following properties have been added: rellist, and sizes. document object model (dom) level 2 htm...
Index - Web APIs
e should be. a value of 0, the default, indicates that no border should be drawn. 1716 htmlimageelement.complete api, fetching, html, html dom, htmlimageelement, loading, property, reference, complete the read-only htmlimageelement interface's complete attribute is a boolean value which indicates whether or not the image has completely loaded. 1717 htmlimageelement.
crossorigin api, cors, cross-origin,
crossorigin, html dom, htmlimageelement, image, property, reference, security, origin the htmlimageelement interface's
crossorigin attribute is a string which specifies the cross-origin resource sharing (cors) setting to use when retrieving the image. 1718 htmlimageelement.currentsrc api, htmlimageelement, image, property, reference, url, currents...
...iaelement, media, property, reference the controlslist property of the htmlmediaelement interface returns a domtokenlist that helps the user agent select what controls to show on the media element whenever the user agent shows its own set of controls. the domtokenlist takes one or more of three possible values: nodownload, nofullscreen, and noremoteplayback. 1775 htmlmediaelement.
crossorigin api, html dom, htmlmediaelement, property, web the htmlmediaelement.
crossorigin property is the cors setting for this image element. see cors settings attributes for details. 1776 htmlmediaelement.currentsrc api, html dom, htmlmediaelement, property, read-only, web the htmlmediaelement.currentsrc property contains the absolute url of the chosen media resource. this ...
SVGImageElement - Web APIs
roke="#d4dde4" stroke-width="2px" /><text x="186" y="94" font-size="12px" font-family="consolas,monaco,andale mono,monospace" fill="#4d4e53" text-anchor="middle" alignment-baseline="middle">svgimageelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties this interface also inherits properties from its parent, svggraphicselement. svgimageelement.
crossorigin a domstring corresponding to the
crossorigin attribute of the given <image> element. svgimageelement.decoding returns a domstring representing a hint given to the browser on how it should decode the image. svgimageelement.height read only an svganimatedlength corresponding to the height attribute of the given <image> element. svgimageelement.preserveaspectratio read only an svganimatedpr...
... used. specifications specification status comment scalable vector graphics (svg) 2the definition of 'svgimageelement' in that specification. candidate recommendation changed the inheritance from svgelement to svggraphicselement, removed the implemented interfaces svgtests, svglangspace, svgexternalresourcesrequired, svgstylable, and svgtransformable and added the
crossorigin property. scalable vector graphics (svg) 1.1 (second edition)the definition of 'svgimageelement' in that specification. recommendation initial definition ...
SVGScriptElement - Web APIs
lignment-baseline="middle">svgscriptelement</text></a></svg></div> a:hover text { fill: #0095dd; pointer-events: all;} properties svgscriptelement.type read only a domstring corresponding to the type attribute of the given <script> element. a domexception is raised with the code no_modification_allowed_err on an attempt to change the value of a read only attribut. svgscriptelement.
crossorigin read only a domstring corresponding to the
crossorigin attribute of the given <script> element. methods this interface doesn't implement any specific methods, but inherits methods from its parent interface, svgelement. specifications specification status comment scalable vector graphics (svg) 2the definition of 'svgscriptelement' in that specification. candidate ...
...nt. methods this interface doesn't implement any specific methods, but inherits methods from its parent interface, svgelement. specifications specification status comment scalable vector graphics (svg) 2the definition of 'svgscriptelement' in that specification. candidate recommendation removed the implemented interface svgexternalresourcesrequired and added the
crossorigin property. scalable vector graphics (svg) 1.1 (second edition)the definition of 'svgscriptelement' in that specification. recommendation initial definition ...
Using textures in WebGL - Web APIs
use textures loaded from file:/// urls in webgl. that means that you'll need a secure web server to test and deploy your code. for local testing, see our guide how do you set up a local testing server? for help. see this hacks.mozilla.org article for an explanation of how to use cors-approved images as webgl textures, with a self-contained example. note: cors support for webgl textures and the
crossorigin attribute for image elements is implemented in gecko 8.0. tainted (write-only) 2d canvases can't be used as webgl textures. a 2d <canvas> becomes tainted, for example, when a cross-domain image is drawn on it. note: cors support for canvas 2d drawimage is implemented in gecko 9.0. this means that using a cross-domain image with cors approval does no longer taint the 2d canvas, so the 2d canva...
...ed as webgl textures. a 2d <canvas> becomes tainted, for example, when a cross-domain image is drawn on it. note: cors support for canvas 2d drawimage is implemented in gecko 9.0. this means that using a cross-domain image with cors approval does no longer taint the 2d canvas, so the 2d canvas remains usable as the source of a webgl texture. note: cors support for cross-domain videos and the
crossorigin attribute for <video> elements is implemented in gecko 12.0. « previousnext » ...
window.postMessage() - Web APIs
example /* * in window a's scripts, with a being on <http://example.com:8080>: */ var popup = window.open(/* popup details */); // wh...
... example /* * in window a's scripts, with a being on <http://example.com:8080>: */ var popup = window.open(/* popup details */); // when the popup has fully loaded, if not blocked by a popup blocker: // this ...
Audio and video manipulation - Developer guides
frames. ordinarily, if you were implementing a "play video in greyscale" feature, you'd probably add display: none to the style for the <video> element, to keep the source video from being drawn to the screen while showing only the canvas showing the altered frames. html we can set up our video player and <canvas> element like this: <video id="my-video" controls="true" width="480" height="270"
crossorigin="anonymous"> <source src="https://udn.realityripple.com/samples/5b/8cd6da9c65.webm" type="video/webm"> <source src="https://udn.realityripple.com/samples/6f/08625b424a.m4v" type="video/mp4"> </video> <canvas id="my-canvas" width="480" height="270"></canvas> javascript this code handles altering the frames. var processor = { timercallback: function() { if (this.video.paused || this.v...
... new audiocontext(), audiosource = context.createmediaelementsource(document.getelementbyid("my-video")), filter = context.createbiquadfilter(); audiosource.connect(filter); filter.connect(context.destination); // configure filter filter.type = "lowshelf"; filter.frequency.value = 1000; filter.gain.value = 25; playable code <video id="my-video" controls="true" width="480" height="270"
crossorigin="anonymous"> <source src="https://udn.realityripple.com/samples/5b/8cd6da9c65.webm" type="video/webm"> <source src="https://udn.realityripple.com/samples/6f/08625b424a.m4v" type="video/mp4"> </video> <div class="playable-buttons"> <input id="edit" type="button" value="edit" /> <input id="reset" type="button" value="reset" /> </div> <textarea id="code" class="playable-code"> filter.type = ...
HTML documentation index - HTML: Hypertext Markup Language
the most basic building block of the web. it defines the meaning and structure of web content. other technologies besides html are generally used to describe a web page's appearance/presentation (css) or functionality/behavior (javascript). 2 allowing cross-origin use of images and canvas advanced, cors, canvas, html, image, reference, security, storage, data html provides a
crossorigin attribute for images that, in combination with an appropriate cors header, allows images defined by the <img> element that are loaded from foreign origins to be used in a <canvas> as if they had been loaded from the current origin. 3 applying color to html elements using css beginner, css, css colors, guide, html, html colors, html styles, styling html, color with css, there ...
...scribing which file types to allow. 38 html attribute: capture api, attribute, attributes, capture, constraint validation, html the capture attribute specifies that, optionally, a new file should be captured, and which device should be used to capture that new media of a type defined by the accept attribute. values include user and environment. 39 html attribute:
crossorigin advanced, attribute, cors, html, needscontent, reference, security the
crossorigin attribute, valid on the <audio>, <img>, <link>, <script>, and <video> elements, provides support for cors, defining how the element handles
crossorigin requests, thereby enabling the configuration of the cors requests for the element's fetched data. depending on the element, the attribute can be a cors se...
Preloading content with rel="preload" - HTML: Hypertext Markup Language
smoother/more responsive for users. browsers that don't support mp4 can still load the webm version, but don't get the advantages of preloading. this shows how preloading content can be combined with the philosophy of progressive enhancement. cross-origin fetches if you've got your sites' cors settings worked out properly, you can successfully preload cross-origin resources as long as you set a
crossorigin attribute on your <link> element. one interesting case where this applies, even if the fetch is not cross-origin, is font files. because of various reasons, these have to be fetched using anonymous mode cors (see font fetching requirements). let's use this case as an example. you can see the full example source code on github (also see it live): <head> <meta charset="utf-8"> <title>web fon...
...-origin, is font files. because of various reasons, these have to be fetched using anonymous mode cors (see font fetching requirements). let's use this case as an example. you can see the full example source code on github (also see it live): <head> <meta charset="utf-8"> <title>web font example</title> <link rel="preload" href="fonts/cicle_fina-webfont.woff2" as="font" type="font/woff2"
crossorigin> <link rel="preload" href="fonts/zantroke-webfont.woff2" as="font" type="font/woff2"
crossorigin> <link href="style.css" rel="stylesheet"> </head> <body> … </body> not only are we providing the mime type hints in the type attributes, but we are also providing the
crossorigin attribute to handle the cors issue. including media one nice feature of <link> elements is their ability to acc...
HTML: Hypertext Markup Language
oducts, and more. this module gets you started with creating the client-side/front-end parts of forms. use html to solve common problems provides links to sections of content explaining how to use html to solve very common problems when creating a web page: dealing with titles, adding images or videos, emphasizing content, creating a basic form, etc. ...
... form, etc. advanced topics cors enabled image the
crossorigin attribute, in combination with an appropriate cors header, allows images defined by the <img> element to be loaded from foreign origins and used in a <canvas> element as if they were being loaded from the current origin. cors settings attributes some html elements that provide support for cors, such as <img> or <video>, have a
crossorigin attribute (
crossorigin property), which lets you configure the cors requests for the element's fetched data. preloading content with rel="preload" the preload value of the <link> element's rel attribute allows you to write declarative fetch requests in your html <head>, specifying resources that your pages will need very soon after loading, which you therefore want to start preloading early in ...
Planned changes to shared memory - JavaScript
is restriction can be removed in the future. webassembly.memory can still be used to get an instance. unless the two headers mentioned above are set, the various postmessage() apis will throw for sharedarraybuffer objects. if they are set, postmessage() on window objects and dedicated workers will function and allow for memory sharing. to avoid having to check whether postmessage() throws, self.
crossoriginisolated is being standardized (a getter that returns a boolean; true if the headers are set), available in window and worker contexts. webassembly shared memory the webassembly threads proposal allows webassembly.memory objects to be created with a new shared constructor flag. when this flag is set to true, the constructed memory object can be shared between workers via postmessage(), just lik...
...uctions are also unconditionally allowed. further reading coop and coep explained. cross-origin-opener-policy: whatwg/html issue #3740, draft specification. cross-origin-embedder-policy: whatwg/html issue #4175, draft specification. cross-origin-resource-policy: standardized in fetch, new cross-origin value is part of the cross-origin-embedder-policy effort. postmessage() changes and self.
crossoriginisolated: whatwg/html issue #4732, whatwg/html issue #4872, draft specification. ...
Using dns-prefetch - Web Performance
nect establishes a connection to a server. this process includes dns resolution, as well as establishing the tcp connection, and performing the tls handshake—if a site is served over https. combining the two provides an opportunity to further reduce the perceived latency of cross-origin requests. you can safely use them together like so: <link rel="preconnect" href="https://fonts.gstatic.com/"
crossorigin> <link rel="dns-prefetch" href="https://fonts.gstatic.com/"> note: if a page needs to make connections to many third-party domains, preconnecting them all is counterproductive. the preconnect hint is best used for only the most critical connections. for the others, just use <link rel="dns-prefetch"> to save time on the first step — the dns lookup. the logic behind pairing these hints is be...
...rt preconnect will still get some added benefit by falling back to dns-prefetch. because this is an html feature, it is very fault-tolerant. if a non-supporting browser encounters a dns-prefetch hint—or any other resource hint—your site won’t break. you just won’t receive the benefits it provides. some resources such as fonts are loaded in anonymous mode. in such cases you should set the
crossorigin attribute with the preconnect hint. if you omit it, the browser will only perform the dns lookup. ...
Blocked: All third-party storage access requests
(a different origin) and content blocking is enabled. the permission can be changed or removed by: going to preferences > content blocking and either adding an exception with the manage exceptions… button choosing the custom content blocking and unchecking the cookies checkbox if the resource that is being blocked doesn't need authentication, you can fix the warning message by adding a
crossorigin="anonymous" attribute to the relevant element. ...
Blocked: Storage access requests from trackers
coming from a tracker and content blocking is enabled. the permission can be changed or removed by: going to preferences > content blocking and either adding an exception with the manage exceptions… button choosing the custom content blocking and unchecking the tracker checkbox if the blocked resource doesn't need authentication, you can fix the warning message by adding a
crossorigin="anonymous" attribute to the relevant element. ...
imgIRequest
y fully decoded. status_error 0x8 an error occurred loading the image. status_frame_complete 0x10 the first frame has been completely decoded. status_decode_complete 0x20 the whole image has been decoded. cors_none 1 cors modes images can be loaded with. by default, all images are loaded with cors_none and cannot be used cross-origin in context like webgl. if an html img element has the
crossorigin attribute set, the imgirequest will be validated for cross-origin usage with cors, and, if successful, will have its cors mode set to the relevant type. cors_anonymous 2 cors_use_credentials 3 methods cancelandforgetobserver() cancels this request as in nsirequest.cancel(); further, also nulls out decoderobserver so it gets no further notifications from us. note: you should not use this...
Using images - Web APIs
t images for use on a canvas. using images from the same page we can obtain a reference to images on the same page as the canvas by using one of: the document.images collection the document.getelementsbytagname() method if you know the id of the specific image you wish to use, you can use document.getelementbyid() to retrieve that specific image using images from other domains using the
crossorigin attribute of an <img> element (reflected by the htmlimageelement.
crossorigin property), you can request permission to load an image from another domain for use in your call to drawimage(). if the hosting domain permits cross-domain access to the image, the image can be used in your canvas without tainting it; otherwise using the image will taint the canvas. using other canvas elements just as w...
GlobalEventHandlers.onerror - Web APIs
r=null in the function is that the browser will be stuck in an endless loop if the onerror image itself generates an error. notes when an error occurs in a script, loaded from a different origin, the details of the error are not reported to prevent leaking information (see bug 363897). instead the error reported is simply "script error." this behavior can be overriden in some browsers using the
crossorigin attribute on <script> and having the server send the appropriate cors http response headers. a workaround is to isolate "script error." and handle it knowing that the error detail is only viewable in the browser console and not accessible via javascript. window.onerror = function (msg, url, lineno, columnno, error) { var string = msg.tolowercase(); var substring = "script error"; if (stri...
HTMLMediaElement - Web APIs
ther user interface items for controlling the resource should be displayed. htmlmediaelement.controlslist read only returns a domtokenlist that helps the user agent select what controls to show on the media element whenever the user agent shows its own set of controls. the domtokenlist takes one or more of three possible values: nodownload, nofullscreen, and noremoteplayback. htmlmediaelement.
crossorigin a domstring indicating the cors setting for this media element. htmlmediaelement.currentsrc read only returns a domstring with the absolute url of the chosen media resource. htmlmediaelement.currenttime a double-precision floating-point value indicating the current playback time in seconds; if the media has not started to play and has not been seeked, this value is the media's initial playb...
HTMLScriptElement - Web APIs
essing details for these attributes are complex, involving many different aspects of html, and therefore are scattered throughout the specification. these algorithms describe the core ideas, but they rely on the parsing rules for <script> start and end tags in html, in foreign content, and in xml; the rules for the document.write() method; the handling of scripting; and so on. htmlscriptelement.
crossorigin is a domstring reflecting the cors setting for the script element. for scripts from other origins, this controls if error information will be exposed. htmlscriptelement.text is a domstring that joins and returns the contents of all text nodes inside the <script> element (ignoring other nodes like comments) in tree order. on setting, it acts the same way as the textcontent idl attribute. ...
Request.mode - Web APIs
rticular means by which it was initiated. for example, when a request object is created using the request.request constructor, the value of the mode property for that request is set to cors. however, for requests created other than by the request.request constructor, no-cors is typically used as the mode; for example, for embedded resources where the request is initiated from markup, unless the
crossorigin attribute is present, the request is in most cases made using the no-cors mode — that is, for the <link> or <script> elements (except when used with modules), or <img>, <audio>, <video>, <object>, <embed>, or <iframe> elements. example in the following snippet, we create a new request using the request.request() constructor (for an image file in the same directory as the script), then save th...
SVGFEImageElement - Web APIs
fill: #0095dd; pointer-events: all;} properties this interface also inherits properties from its parent interface, svgelement, and implements properties of svgfilterprimitivestandardattributes and svgurireference. svgfeimageelement.preserveaspectratio read only an svganimatedpreserveaspectratio corresponding to the preserveaspectratio attribute of the given element. svgfeimageelement.
crossorigin read only an svganimatedstring reflects the
crossorigin attribute of the given element, limited to only known values. methods this interface does not provide any specific methods, but implements those of its parent, svgelement, and implements methods of svgfilterprimitivestandardattributesand svgurireference. specifications specification status comment filter effect...
Using the Web Audio API - Web APIs
ways to do this with the api. let's begin with a simple method — as we have a boombox, we most likely want to play a full song track. also, for accessibility, it's nice to expose that track in the dom. we'll expose the song on the page using an <audio> element. <audio src="mycooltrack.mp3"></audio> note: if the sound file you're loading is held on a different domain you will need to use the
crossorigin attribute; see cross origin resource sharing (cors) for more information. to use all the nice things we get with the web audio api, we need to grab the source from this element and pipe it into the context we have created. lucky for us there's a method that allows us to do just that — audiocontext.createmediaelementsource: // get the audio element const audioelement = document.queryselector(...
WindowOrWorkerGlobalScope - Web APIs
pe. properties these properties are defined on the windoworworkerglobalscope mixin, and implemented by window and workerglobalscope. windoworworkerglobalscope.caches read only returns the cachestorage object associated with the current context. this object enables functionality such as storing assets for offline use, and generating custom responses to requests. windoworworkerglobalscope.
crossoriginisolated read only returns a boolean value that indicates whether a sharedarraybuffer can be sent via a window.postmessage() call. windoworworkerglobalscope.indexeddb read only provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an idbfactory object. windoworworkerglobalscope.issecurecontext read only returns a boolean indicating whethe...
HTML attribute reference - HTML: Hypertext Markup Language
indicates whether the element's content is editable. contextmenu global attribute defines the id of a <menu> element which will serve as the element's context menu. controls <audio>, <video> indicates whether the browser should show playback controls to the user. coords <area> a set of values specifying the coordinates of the hot-spot region.
crossorigin <audio>, <img>, <link>, <script>, <video> how the element handles cross-origin requests csp <iframe> specifies the content security policy that an embedded document must agree to enforce upon itself. data <object> specifies the url of the resource. data-* global attribute lets you attach custom attributes to an html element. datetime ...
<audio>: The Embed Audio element - HTML: Hypertext Markup Language
fically enable it). however, this can be useful when creating media elements whose source will be set at a later time, under user control. see our autoplay guide for additional information about how to properly use autoplay. controls if this attribute is present, the browser will offer controls to allow the user to control audio playback, including volume, seeking, and pause/resume playback.
crossorigin this enumerated attribute indicates whether to use cors to fetch the related audio file. cors-enabled resources can be reused in the <canvas> element without being tainted. the allowed values are: anonymous sends a cross-origin request without a credential. in other words, it sends the origin: http header without a cookie, x.509 certificate, or performing http basic authentication. if the ...
<script>: The Script element - HTML: Hypertext Markup Language
ascript where the browser would have to load and evaluate scripts before continuing to parse. defer has a similar effect in this case. this is a boolean attribute: the presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value. see browser compatibility for notes on browser support. see also async scripts for asm.js.
crossorigin normal script elements pass minimal information to the window.onerror for scripts which do not pass the standard cors checks. to allow error logging for sites which use a separate domain for static media, use this attribute. see cors settings attributes for a more descriptive explanation of its valid arguments. defer this boolean attribute is set to indicate to a browser that the script is m...
<track>: The Embed Text Track element - HTML: Hypertext Markup Language
cks used by scripts. not visible to the user. label a user-readable title of the text track which is used by the browser when listing available text tracks. src address of the track (.vtt file). must be a valid url. this attribute must be specified and its url value must have the same origin as the document — unless the <audio> or <video> parent element of the track element has a
crossorigin attribute. srclang language of the track text data. it must be a valid bcp 47 language tag. if the kind attribute is set to subtitles, then srclang must be defined. usage notes track data types the type of data that track adds to the media is set in the kind attribute, which can take values of subtitles, captions, descriptions, chapters or metadata. the element points to a source file conta...
<video>: The Video Embed element - HTML: Hypertext Markup Language
e controlslist attribute, when specified, helps the browser select what controls to show on the media element whenever the browser shows its own set of controls (e.g. when the controls attribute is specified). the allowed values are nodownload, nofullscreen and noremoteplayback. use the disablepictureinpicture attribute if you want to disable the picture-in-picture mode (and the control).
crossorigin this enumerated attribute indicates whether to use cors to fetch the related image. cors-enabled resources can be reused in the <canvas> element without being tainted. the allowed values are: anonymous sends a cross-origin request without a credential. in other words, it sends the origin: http header without a cookie, x.509 certificate, or performing http basic authentication. if the serve...
Link types - HTML: Hypertext Markup Language
ction to the linked web site in advance, without disclosing any private information or downloading any content, so that when the link is followed the linked content can be fetched more quickly. <link> <a>, <area>, <form> prefetch suggests that the browser fetch the linked resource in advance, as it is likely to be requested by the user. starting with firefox 44, the value of the
crossorigin attribute is taken into consideration, making it possible to make anonymous prefetches. note: the link prefetch faq has details on which links can be prefetched and on alternative methods. <link> <a>, <area>, <form> preload tells the browser to download a resource because this resource will be needed later during the current navigation. see preloading content with rel="...
Reason: CORS header 'Access-Control-Allow-Origin' missing - HTTP
ng.site to access the resource using cors, the header should be: access-control-allow-origin: https://amazing.site you can also configure a site to allow any site to access it by using the * wildcard. you should only use this for public apis. private apis should never use *, and should instead have a specific domain or domains set. in addition, the wildcard only works for requests made with the
crossorigin attribute set to anonymous, and it prevents sending credentials like cookies in requests. access-control-allow-origin: * warning: using the wildcard to allow all sites to access a private api is a bad idea. to allow any site to make cors requests without using the * wildcard (for example, to enable credentials), your server must read the value of the request's origin header and use that valu...
CSP: referrer - HTTP
default behavior if no policy is specified. the origin is sent as referrer to a-priori as-much-secure destination (https->https), but isn't sent to a less secure destination (https->http). "origin" only send the origin of the document as the referrer in all cases. the document https://example.com/page.html will send the referrer https://example.com/. "origin-when-cross-origin" / "origin-when-
crossorigin" send a full url when performing a same-origin request, but only send the origin of the document for other cases. "unsafe-url" send a full url (stripped from parameters) when performing a same-origin or cross-origin request. this policy will leak origins and paths from tls-protected resources to insecure origins. carefully consider the impact of this setting. examples content-security-polic...
Cross-Origin-Opener-Policy - HTTP
fer objects or performance.now() with unthrottled timers are only available if your document has a coop header with the value same-origin value set. cross-origin-opener-policy: same-origin cross-origin-embedder-policy: require-corp see also the cross-origin-embedder-policy header which you'll need to set as well. to check if cross-origin isolation has been successful, you can test against the
crossoriginisolated property available to window and worker contexts: if (
crossoriginisolated) { // post sharedarraybuffer } else { // do something else } specifications specification html living standardthe definition of 'cross-origin-opener-policy header' in that specification. ...
SharedArrayBuffer - JavaScript
to be set to cross-origin isolate your site: cross-origin-opener-policy with same-origin as value (protects your origin from attackers) cross-origin-embedder-policy with require-corp as value (protects victims from your origin) cross-origin-opener-policy: same-origin cross-origin-embedder-policy: require-corp to check if cross origin isolation has been successful, you can test against the
crossoriginisolated property available to window and worker contexts: if (
crossoriginisolated) { // post sharedarraybuffer } else { // do something else } see also planned changes to shared memory which is starting to roll out to browsers (firefox 79, for example.) always use the new operator to create a sharedarraybuffer sharedarraybuffer constructors are required to be constructed with a new operat...
Web app manifests
/manifest.webmanifest"> note: the .webmanifest extension is specified in the media type registration section of the specification (the response of the manifest file should return content-type: application/manifest+json). browsers generally support manifests with other appropriate extensions like .json (content-type: application/json). note: if the manifest requires credentials to fetch - the
crossorigin attribute must be set to use-credentials, even if the manifest file is in the same origin as the current page. splash screens in chrome 47 and later, a splash screen is displayed for sites launched from a homescreen. this splashscreen is auto-generated from properties in the web app manifest, specifically: name background_color the icon in the icons array that is closest to 128dpi for the...
<script> - SVG: Scalable Vector Graphics
value type: <string>; default value: ?; animatable: yes href the url to the script to load. value type: <url> ; default value: none; animatable: no type this attribute defines type of the script language to use. value type: <string>; default value: application/ecmascript; animatable: no xlink:href deprecated si...
SVG 2 support in Mozilla - SVG: Scalable Vector Graphics
length attribute and indexed property for list interfaces implementation status unknown <script> element in content model of all elements implementation status unknown initialize(), appenditem(), replaceitem(), and insertitembefore() on list objects making a copy of any list item being inserted that is already in another list implementation status unknown
crossorigin attribute for <image> and <script> elements not implemented yet (at least for <image>; bug 1240357) rendering model change notes svg root and <foreignobject> not overflow:hidden in ua style sheet implementation status unknown allow overflow: auto; to clip and show scroll bars implementation status unknown allow overflow: scroll; to show ...
Subresource Integrity - Web security
> element you can use the following <script> element to tell a browser that before executing the https://example.com/example-framework.js script, the browser must first compare the script to the expected hash, and verify that there's a match. <script src="https://example.com/example-framework.js" integrity="sha384-oqvuafxrkap7fdgccy5uykm6+r9gqq8k/uxy9rx7hnqlgyl1kpzqho1wx4jwy8wc"
crossorigin="anonymous"></script> note: for more details on the purpose of the
crossorigin attribute, see cors settings attributes. how browsers handle subresource integrity browsers handle sri by doing the following: when a browser encounters a <script> or <link> element with an integrity attribute, before executing the script or before applying any stylesheet specified by the <link> element, the ...