<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1212477 --> <head> <meta charset="utf-8"> <title>Test for Bug 1212477 - Needs a way to access to <canvas>'s context (2d, webgl) from Anonymous Content API</title> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1212477">Mozilla Bug 1212477</a> <div> <div id="id" class="test">text content</div> <canvas id="canvas2d"></canvas> <canvas id="canvas-webgl"></canvas> <canvas id="canvas-foo"></canvas> </div> <script type="application/javascript;version=1.8"> let chromeDocument = SpecialPowers.wrap(document); let testElement = document.querySelector("div"); let anonymousContent = chromeDocument.insertAnonymousContent(testElement); is(anonymousContent.getCanvasContext("id", "2d"), null, "Context is null for non-canvas elements"); let context2d = anonymousContent.getCanvasContext("canvas2d", "2d"); is(context2d.toString(), "[object CanvasRenderingContext2D]", "2D Context is returned properly"); is(context2d.canvas, null, "context's canvas property is null in anonymous content"); is (anonymousContent.getCanvasContext("canvas-foo", "foo"), null, "Context is null for unknown context type"); SimpleTest.doesThrow( () => anonymousContent.getCanvasContext("foo", "2d"), "NS_ERROR_NOT_AVAILABLE", "Get a context using unexisting id should throw" ); let webgl = anonymousContent.getCanvasContext("canvas-webgl", "webgl"); is(webgl.toString(), "[object WebGLRenderingContext]", "WebGL Context is returned properly"); is(webgl.canvas, null, "WebGL context's canvas property is null in anonymous content"); chromeDocument.removeAnonymousContent(anonymousContent); </script> </body> </html>