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diff --git a/dom/canvas/test/webgl-conf/checkout/extra/readpixels-after-alert.html b/dom/canvas/test/webgl-conf/checkout/extra/readpixels-after-alert.html
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+++ b/dom/canvas/test/webgl-conf/checkout/extra/readpixels-after-alert.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 Behavior After Alert and Read Pixels Test</title>
+<link rel="stylesheet" href="../resources/js-test-style.css"/>
+<script src="../../devtools/src/debug/webgl-debug.js"></script>
+<script src="../js/js-test-pre.js"></script>
+<script src="../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<canvas id="canvas" width="100" height="100"> </canvas>
+<div id="description">Verify WebGL behavior after an alert and then a readPixels()</div>
+<div id="console"></div>
+<script>
+"use strict";
+
+function checkPixels(buf, width, height, thresh) {
+  for (var yy = 0; yy < height; ++yy) {
+    for (var xx = 0; xx < width; ++xx) {
+      var offset = (yy * width + xx) * 4;
+      if (Math.abs(buf[offset] - 255) > thresh ||
+          Math.abs(buf[offset + 1] - 0) > thresh ||
+          Math.abs(buf[offset + 2] - 0) > thresh) {
+        testFailed("Checking pixels");
+        return false;
+      }
+    }
+  }
+  testPassed("Checking pixels");
+  return true;
+}
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("canvas");
+gl.clearColor(1, 0, 0, 1);
+gl.clear(gl.COLOR_BUFFER_BIT);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setup should succeed");
+
+wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
+
+alert("Click me to continue");
+
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setup should succeed");
+wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
+
+alert("Click me to continue");
+
+gl.clearColor(1, 0, 0, 1);
+gl.clear(gl.COLOR_BUFFER_BIT);
+wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../js/js-test-post.js"></script>
+
+</body>
+</html>