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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation.html b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation.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 verifies the correct number of indices");
+
+function sizeInBytes(type) {
+  switch (type) {
+  case gl.BYTE:
+  case gl.UNSIGNED_BYTE:
+    return 1;
+  case gl.SHORT:
+  case gl.UNSIGNED_SHORT:
+    return 2;
+  case gl.INT:
+  case gl.UNSIGNED_INT:
+  case gl.FLOAT:
+    return 4;
+  default:
+    throw "unknown type";
+  }
+}
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext();
+var program = wtu.loadStandardProgram(gl);
+
+// 3 vertices => 1 triangle, interleaved data
+var dataComplete = new Float32Array([0, 0, 0, 1,
+                                     0, 0, 1,
+                                     1, 0, 0, 1,
+                                     0, 0, 1,
+                                     1, 1, 1, 1,
+                                     0, 0, 1]);
+var dataIncomplete = new Float32Array([0, 0, 0, 1,
+                                       0, 0, 1,
+                                       1, 0, 0, 1,
+                                       0, 0, 1,
+                                       1, 1, 1, 1]);
+var indices = new Uint16Array([0, 1, 2]);
+
+debug("Testing with valid indices");
+
+var bufferComplete = gl.createBuffer();
+gl.bindBuffer(gl.ARRAY_BUFFER, bufferComplete);
+gl.bufferData(gl.ARRAY_BUFFER, dataComplete, gl.STATIC_DRAW);
+var elements = gl.createBuffer();
+gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elements);
+gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
+gl.useProgram(program);
+var vertexLoc = gl.getAttribLocation(program, "a_vertex");
+var normalLoc = gl.getAttribLocation(program, "a_normal");
+gl.vertexAttribPointer(vertexLoc, 4, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 0);
+gl.enableVertexAttribArray(vertexLoc);
+gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
+gl.enableVertexAttribArray(normalLoc);
+shouldBe('gl.checkFramebufferStatus(gl.FRAMEBUFFER)', 'gl.FRAMEBUFFER_COMPLETE');
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+
+debug("Testing with out-of-range indices");
+
+var bufferIncomplete = gl.createBuffer();
+gl.bindBuffer(gl.ARRAY_BUFFER, bufferIncomplete);
+gl.bufferData(gl.ARRAY_BUFFER, dataIncomplete, gl.STATIC_DRAW);
+gl.vertexAttribPointer(vertexLoc, 4, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 0);
+gl.enableVertexAttribArray(vertexLoc);
+gl.disableVertexAttribArray(normalLoc);
+debug("Enable vertices, valid");
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+debug("Enable normals, out-of-range");
+gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
+gl.enableVertexAttribArray(normalLoc);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
+wtu.glErrorShouldBe(gl, [gl.INVALID_OPERATION, gl.NO_ERROR]);
+
+debug("Test with enabled attribute that does not belong to current program");
+
+gl.disableVertexAttribArray(normalLoc);
+var extraLoc = Math.max(vertexLoc, normalLoc) + 1;
+gl.enableVertexAttribArray(extraLoc);
+debug("Enable an extra attribute with null");
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
+wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION);
+debug("Enable an extra attribute with insufficient data buffer");
+gl.vertexAttribPointer(extraLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), 4 * sizeInBytes(gl.FLOAT));
+wtu.glErrorShouldBe(gl, gl.NO_ERROR);
+shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
+debug("Pass large negative index to vertexAttribPointer");
+gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 7 * sizeInBytes(gl.FLOAT), -2000000000 * sizeInBytes(gl.FLOAT));
+wtu.glErrorShouldBe(gl, gl.INVALID_VALUE);
+shouldBeUndefined('gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0)');
+
+var successfullyParsed = true;
+</script>
+
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>