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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/context/context-type-test.html b/dom/canvas/test/webgl-conf/checkout/conformance/context/context-type-test.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/context/context-type-test.html
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+<!--
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebGL Canvas Conformance Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
+<canvas id="canvas2d" width="40" height="40"> </canvas>
+<script>
+"use strict";
+description("This test ensures WebGL implementations interact correctly with the canvas tag.");
+
+debug("");
+debug("Canvas.getContext");
+
+assertMsg(window.WebGLRenderingContext,
+          "WebGLRenderingContext should be a member of window");
+assertMsg('WebGLRenderingContext' in window,
+          "WebGLRenderingContext should be 'in' window");
+assertMsg(Object.getPrototypeOf(WebGLRenderingContext.prototype) === Object.prototype,
+          "WebGLRenderingContext should only have Object in it's prototype chain");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var gl = wtu.create3DContext(canvas);
+if (!gl) {
+  testFailed("context does not exist");
+} else {
+  testPassed("context exists");
+
+  debug("Checking context type");
+  assertMsg(gl instanceof WebGLRenderingContext,
+            "context type should be WebGLRenderingContext");
+}
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>