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HTMLImageElement.crossOrigin - Web APIs
the htmlimageelement interface's
crossorigin attribute is a string which specifies the cross-origin resource sharing (cors) setting to use when retrieving the image.
... syntax htmlimageelement.
crossorigin =
crossoriginmode; let
crossoriginmode = htmlimageelement.
crossorigin; value a domstring of a keyword specifying the cors mode to use when fetching the image resource.
... if you don't specify
crossorigin, the image is fetched without cors (the fetch no-cors mode).
...And 5 more matches
HTML attribute: crossorigin - HTML: Hypertext Markup Language
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.
... the
crossorigin content attribute on media elements is a cors settings attribute.
... "" setting the attribute name to an empty value, like
crossorigin or
crossorigin="", is the same as anonymous.
...And 4 more matches
HTMLMediaElement.crossOrigin - Web APIs
the htmlmediaelement.
crossorigin property is the cors setting for this image element.
... 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.
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.
... 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.
Allowing cross-origin use of images and canvas - HTML: Hypertext Markup Language
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.
... see cors settings attributes for details on how the
crossorigin attribute is used.
... the key is to use the
crossorigin attribute by setting
crossorigin on the htmlimageelement into which the image will be loaded.
...And 2 more matches
<link>: The External Resource Link element - HTML: Hypertext Markup Language
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.
... 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.
...And 2 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.
...
crossorigin indicates if the fetching of the image must be done using a cors request.
... 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.
... if the
crossorigin attribute is specified, then a cors request is sent (with the origin request header); but if the server does not opt into allowing cross-origin access to the image data by the origin site (by not sending any access-control-allow-origin response header, or by not including the site's origin in any access-control-allow-origin response header it does send), then the browser marks the image as tainted and restricts access to its image data, preventing its usage in <canvas> elements.
WebIDL bindings
[
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.
Cross-Origin-Embedder-Policy - HTTP
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.
... 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 } 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 ...
...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
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.
...this provision can be overridden by passing { allow
crossoriginarguments: true } to exportfunction.
nsIXPConnect
returns an xpcnativewrapper, xpcsafejsobjectwrapper, or xpc
crossoriginwrapper for the given object based on the principal, scope, and filename flags that are passed in.
... ascope the scope to be used in the event that we create an xpc
crossoriginwrapper.
HTMLImageElement - Web APIs
htmlimageelement.
crossorigin a domstring specifying the cors setting for this image element.
... the following properties have been added:
crossorigin, naturalwidth, naturalheight, and complete.
HTMLLinkElement - Web APIs
htmllinkelement.
crossorigin is a domstring that corresponds to the cors setting for this link element.
... living standard adds the following properties:
crossorigin, referrerpolicy, and as.
Index - Web APIs
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.
... 1775 htmlmediaelement.
crossorigin api, html dom, htmlmediaelement, property, web the htmlmediaelement.
crossorigin property is the cors setting for this image element.
SVGImageElement - Web APIs
svgimageelement.
crossorigin a domstring corresponding to the
crossorigin attribute of the given <image> element.
... candidate recommendation changed the inheritance from svgelement to svggraphicselement, removed the implemented interfaces svgtests, svglangspace, svgexternalresourcesrequired, svgstylable, and svgtransformable and added the
crossorigin property.
SVGScriptElement - Web APIs
svgscriptelement.
crossorigin read only a domstring corresponding to the
crossorigin attribute of the given <script> element.
... candidate recommendation removed the implemented interface svgexternalresourcesrequired and added the
crossorigin property.
Using textures in WebGL - Web APIs
note: cors support for webgl textures and the
crossorigin attribute for image elements is implemented in gecko 8.0.
... note: cors support for cross-domain videos and the
crossorigin attribute for <video> elements is implemented in gecko 12.0.
Audio and video manipulation - Developer guides
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.
... 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
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.
... 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.
Preloading content with rel="preload" - HTML: Hypertext Markup Language
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.
...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.
HTML: Hypertext Markup Language
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.
Planned changes to shared memory - JavaScript
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.
... postmessage() changes and self.
crossoriginisolated: whatwg/html issue #4732, whatwg/html issue #4872, draft specification.
Using dns-prefetch - Web Performance
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.
...in such cases you should set the
crossorigin attribute with the preconnect hint.
Blocked: All storage access requests
the permission can be changed or removed by: going to preferences > content blocking in the custom content blocking section, selecting a value other than all cookies for the cookies item if the resource that is being blocked doesn't need authentication, you can fix the warning message by adding a
crossorigin="anonymous" attribute to your element.
Blocked: All third-party storage access requests
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
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
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.
Manipulating video using canvas - Web APIs
und: black; color:#cccccc; } #c2 { background-image: url(media/foo.png); background-repeat: no-repeat; } div { float: left; border :1px solid #444444; padding:10px; margin: 10px; background:#3b3b3b; } </style> </head> <body> <div> <video id="video" src="media/video.mp4" controls="true"
crossorigin="anonymous"/> </div> <div> <canvas id="c1" width="160" height="96"></canvas> <canvas id="c2" width="160" height="96"></canvas> </div> <script type="text/javascript" src="processor.js"></script> </body> </html> the key bits to take away from this are: this document establishes two canvas elements, with the ids c1 and c2.
Using images - Web APIs
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().
GlobalEventHandlers.onerror - Web APIs
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.
Request.mode - Web APIs
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.
SVGFEImageElement - Web APIs
svgfeimageelement.
crossorigin read only an svganimatedstring reflects the
crossorigin attribute of the given element, limited to only known values.
Using the Web Audio API - Web APIs
<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.
window.postMessage() - Web APIs
red memory is gated behind two http headers: 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).
WindowOrWorkerGlobalScope - Web APIs
windoworworkerglobalscope.
crossoriginisolated read only returns a boolean value that indicates whether a sharedarraybuffer can be sent via a window.postmessage() call.
prefers-reduced-data - CSS: Cascading Style Sheets
in this example the montserrat-regular.woff2 font file will neither be preloaded nor downloaded if the user prefers reduced data, in this case the "system font stack" will serve as the fallback font: html <head> <link rel="preload" href="fonts/montserrat-regular.woff2" as="font" media="(prefers-reduced-data: no-preference)"
crossorigin> <link rel="stylesheet" href="style.css"> </head> css @media (prefers-reduced-data: no-preference) { @font-face { font-family: montserrat; font-style: normal; font-weight: 400; font-display: swap; /* latin */ src: local('montserrat regular'), local('montserrat-regular'), url('fonts/montserrat-regular.woff2') format('woff2'); unicode...
CSP: referrer - HTTP
"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.
CSP: require-sri-for - HTTP
<script src="https://code.jquery.com/jquery-3.1.1.slim.js" integrity="sha256-5i/mq300m779n2ovdrl16lbohwxnudzl/r2avuxyxwa="
crossorigin="anonymous"></script> however, scripts without integrity won't load anymore: <script src="https://code.jquery.com/jquery-3.1.1.slim.js"></script> ...
Cross-Origin-Opener-Policy - HTTP
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
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.
<script> - SVG: Scalable Vector Graphics
2,'0') const g = math.round(math.random() * 255).tostring(16).padstart(2,'0') const b = math.round(math.random() * 255).tostring(16).padstart(2,'0') return `#${r}${g}${b}` } document.queryselector('circle').addeventlistener('click', (e) => { e.target.style.fill = getcolor() }) }) // ]]> </script> <circle cx="5" cy="5" r="4" /> </svg> attributes
crossorigin this attribute defines cors settings as define for the html <script> element.
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
<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.