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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/tex-subimage3d-canvas-bug.html b/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/tex-subimage3d-canvas-bug.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 bug of TexSubImage3D with canvas</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="2" height="2" style="width: 2px; height: 2px;"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description(document.title);
+debug("This is a regression test for <a href='https://bugs.chromium.org/p/chromium/issues/detail?id=859400'>Chromium Issue 859400</a>");
+debug("");
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example", undefined, 2);
+
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");
+
+function runTest() {
+  var ctx = document.createElement('canvas').getContext("2d");
+  var maxTexSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);
+  var width = Math.ceil(Math.sqrt(maxTexSize));
+  var height = width;
+  var depth = width + 1;
+  ctx.canvas.width = width;
+  // Set canvas height to a value larger than MAX_TEXTURE_SIZE.
+  // This triggers a validation bug in Chrome.
+  ctx.canvas.height = height * depth;
+
+  var tex = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_2D_ARRAY, tex);
+  gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.RGBA8, width, height, depth);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from TexStorage3D.");
+  gl.texSubImage3D(gl.TEXTURE_2D_ARRAY, 0, 0, 0, 0, width, height, depth,
+                   gl.RGBA, gl.UNSIGNED_BYTE, ctx.canvas);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from TexSubImage3D.");
+}
+
+runTest();
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+</body>
+</html>