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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-large-buffer.html b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-large-buffer.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">
+<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>
+<div id="description"></div>
+<div id="console"></div>
+
+<script>
+"use strict";
+description('Tests that index validation for drawElements works with large attribute buffers');
+
+var wtu = WebGLTestUtils;
+var context = wtu.create3DContext();
+var program = wtu.loadStandardProgram(context);
+
+context.useProgram(program);
+
+// Create a small index buffer.
+var indexObject = context.createBuffer();
+context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);
+var indexArray = new Uint16Array([0, 1, 2]);
+context.bufferData(context.ELEMENT_ARRAY_BUFFER, indexArray, context.STATIC_DRAW);
+
+// Create a large attribute buffer.
+var vertexObject = context.createBuffer();
+context.enableVertexAttribArray(0);
+context.bindBuffer(context.ARRAY_BUFFER, vertexObject);
+context.bufferData(context.ARRAY_BUFFER, new Float32Array(3 * 65536), context.STATIC_DRAW);
+context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0);
+
+debug("Test large attribute buffer")
+wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 0)");
+
+// Enlarge the attribute buffer slightly.
+debug("Test even larger attribute buffer")
+context.bufferData(context.ARRAY_BUFFER, new Float32Array(3 * 65536 + 3), context.STATIC_DRAW);
+wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 0)");
+
+debug("")
+var successfullyParsed = true;
+</script>
+
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>