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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-verifies-too-many-indices.html b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-verifies-too-many-indices.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-verifies-too-many-indices.html
@@ -0,0 +1,50 @@
+<!--
+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 does not examine too many indices');
+
+var wtu = WebGLTestUtils;
+var context = wtu.create3DContext();
+var program = wtu.loadStandardProgram(context);
+
+context.useProgram(program);
+var vertexObject = context.createBuffer();
+context.enableVertexAttribArray(0);
+context.bindBuffer(context.ARRAY_BUFFER, vertexObject);
+// 4 vertices -> 2 triangles
+context.bufferData(context.ARRAY_BUFFER, new Float32Array([ 0,0,0, 0,1,0, 1,0,0, 1,1,0 ]), context.STATIC_DRAW);
+context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0);
+
+var indexObject = context.createBuffer();
+
+debug("Test out of range indices")
+context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);
+context.bufferData(context.ELEMENT_ARRAY_BUFFER, new Uint16Array([ 10000, 0, 1, 2, 3, 10000 ]), context.STATIC_DRAW);
+var indexValidationError = wtu.shouldGenerateGLError(context, [context.INVALID_OPERATION, context.NO_ERROR], "context.drawElements(context.TRIANGLE_STRIP, 4, context.UNSIGNED_SHORT, 0)");
+wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLE_STRIP, 4, context.UNSIGNED_SHORT, 2)");
+wtu.shouldGenerateGLError(context, indexValidationError, "context.drawElements(context.TRIANGLE_STRIP, 4, context.UNSIGNED_SHORT, 4)");
+
+debug("")
+var successfullyParsed = true;
+</script>
+
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>