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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/manual/angle-instanced-arrays-state-leakage.html b/dom/canvas/test/webgl-conf/checkout/conformance/manual/angle-instanced-arrays-state-leakage.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/manual/angle-instanced-arrays-state-leakage.html
@@ -0,0 +1,78 @@
+<!--
+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>Check that ANGLE_instanced_arrays state does not leak to browser</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>
+<style>
+canvas {
+    border: 1px solid black;
+}
+.correct {
+    border: 1px solid black;
+    background-color: #00ff00;
+}
+</style>
+</head>
+<body>
+<pre>
+This test must be run manually.
+
+This test tests that leaving state for ANGLE_instanced_arrays with non-default values at the
+end of rendering does not interfere with proper compositing of results.
+Failures seen on Linux and Mac with Chrome 32.
+See http://crbug.com/304927 for more info.
+
+You should see a <span class="correct">green rectangle</span>
+with black a outline on success.  Briefly flashing red is normal.
+</pre>
+<canvas id='c'></canvas>
+<div id="console"></div>
+<script>
+"use strict";
+var wtu = WebGLTestUtils;
+var c = document.getElementById("c");
+// The bug has only been seen with preserveDrawingBuffer=true.
+var gl = wtu.create3DContext(c, { preserveDrawingBuffer: true });
+var ext = wtu.getExtensionWithKnownPrefixes(gl, "ANGLE_instanced_arrays");
+var frame = 0;
+function render() {
+  var RED_FRAMES = 3;
+  if (frame < RED_FRAMES) {
+    // Draw N frames red, leaving the vertex divisor to 0 after each call.
+    gl.clearColor(1,0,0,1);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    wtu.requestAnimFrame(render);
+  } else {
+    // Draw 2 more times in green, setting the divisor to 1 afterward.
+    gl.clearColor(0,1,0,1);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    if (frame - RED_FRAMES < 2) {
+      wtu.requestAnimFrame(render);
+    } else {
+      finishTest();
+    }
+    // Leave attrib 0 set with a divisor of 1 before returning to browser.
+    if (ext) {
+       ext.vertexAttribDivisorANGLE(0, 1);
+    }
+  }
+  frame++;
+}
+
+if (!ext) {
+  testPassed("No ANGLE_instanced_arrays support -- this is legal");
+}
+wtu.requestAnimFrame(render);
+var successfullyParsed = true;
+</script>
+</body>
+</html>