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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/gl-pixelstorei.html b/dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/gl-pixelstorei.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 pixelStorei Test</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>
+<canvas id="example" width="50" height="50"></canvas>
+<canvas id="2d00" width="50" height="50"></canvas>
+<canvas id="2d01" width="50" height="50"></canvas>
+<canvas id="2d02" width="50" height="50"></canvas>
+<canvas id="2d03" width="50" height="50"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+void main() {
+  gl_Position = vPosition;
+}
+</script>
+
+<script id="fshader" type="x-shader/x-fragment">
+void main() {
+  gl_FragColor = vec4(1.0,0.0,0.0,1.0);
+}
+</script>
+
+<script>
+"use strict";
+function init() {
+  description("This test checks that drawImage and readPixels are not effected by gl.Pixelstorei(gl.PACK_ALIGNMENT) and visa versa");
+
+  debug("There should be 5 red triangles on 5 black squares above");
+  debug("");
+
+  var wtu = WebGLTestUtils;
+  var canvas3d = document.getElementById("example");
+  var gl = wtu.create3DContext("example");
+  var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
+
+  var vertexObject = gl.createBuffer();
+  gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
+  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ 0,0.5,0, -0.5,-0.5,0, 0.5,-0.5,0 ]), gl.STATIC_DRAW);
+  gl.enableVertexAttribArray(0);
+  gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
+
+  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+  gl.drawArrays(gl.TRIANGLES, 0, 3);
+
+  function checkData(ctx, name) {
+    // Test several locations
+    // First line should be all black
+    wtu.checkCanvasRect(ctx, 0, 0, 50, 1, [0, 0, 0, 0]);
+
+    // Line 25 should be red for at least 6 red pixels starting 22 pixels in
+    wtu.checkCanvasRect(ctx, 22, 25, 6, 1, [255, 0, 0, 255]);
+
+    // Last line should be all black
+    wtu.checkCanvasRect(ctx, 0, 49, 50, 1, [0, 0, 0, 0]);
+  }
+
+  var ctx2d;
+
+  function checkColors() {
+    checkData(gl, "3d context");
+    checkData(ctx2d, "2d context");
+  }
+
+  var table = [1, 2, 4, 8];
+  for (var ii = 0; ii < table.length; ++ii) {
+    gl.pixelStorei(gl.PACK_ALIGNMENT, table[ii]);
+    ctx2d = document.getElementById("2d0" + ii).getContext("2d");
+    ctx2d.globalCompositeOperation = 'copy';
+    ctx2d.drawImage(canvas3d, 0, 0);
+    checkColors();
+    assertMsg(gl.getParameter(gl.PACK_ALIGNMENT) == table[ii],
+        "PACK_ALIGNMENT is " + table[ii]);
+  }
+}
+
+init();
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>