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+<!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 &lt;canvas&gt;'s context (2d, webgl) from Anonymous Content API</title>
+ <script 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">
+ 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"
+ );
+
+ const normalWebGL = document.createElement('canvas').getContext('webgl');
+ if (normalWebGL) {
+ 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>