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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/offscreencanvas/offscreencanvas-transfer-image-bitmap.html b/dom/canvas/test/webgl-conf/checkout/conformance2/offscreencanvas/offscreencanvas-transfer-image-bitmap.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/offscreencanvas/offscreencanvas-transfer-image-bitmap.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>Test for OffscreenCanvas TransferToImageBitmap</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>
+<script src="../../js/tests/tex-image-and-sub-image-utils.js"></script>
+<script src="../../js/tests/offscreencanvas-transfer-image-bitmap.js"></script>
+</head>
+<body>
+  <div id="description"></div>
+  <div id="console"></div>
+  <script id='myWorker' type='text/worker'>
+  self.onmessage = function(e) {
+      var canvas = new OffscreenCanvas(128, 128);
+      var gl = canvas.getContext("webgl2");
+      gl.clearColor(1.0, 1.0, 0.0, 1.0);
+      gl.clear(gl.COLOR_BUFFER_BIT);
+      var image = canvas.transferToImageBitmap();
+
+      self.postMessage({ bitmap: image },
+                       [ image ]);
+  };
+  </script>
+  <script>
+    "use strict";
+    description("This test ensures that the transferToImageBitmap function of OffscreenCanvas webgl2 context is functional.");
+    if (!window.OffscreenCanvas) {
+        testPassed("No OffscreenCanvas support");
+        finishTest();
+    } else {
+      var blob = new Blob([document.getElementById('myWorker').textContent]);
+      var worker = new Worker(URL.createObjectURL(blob));
+
+      worker.onmessage = function(msg) {
+          testTransferToImageBitmap("webgl2", msg.data.bitmap);
+          finishTest();
+      }
+      worker.postMessage("Start Worker");
+    }
+  </script>
+</body>
+</html>