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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-with-resized-buffer.html b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-with-resized-buffer.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/buffers/index-validation-with-resized-buffer.html
@@ -0,0 +1,107 @@
+<!--
+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>
+<canvas id="example" width="1" height="1"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+
+<script id="vs" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+attribute vec4 vColor;
+varying vec4 color;
+void main() {
+    gl_Position = vPosition;
+    color = vColor;
+}
+</script>
+<script id="fs" type="x-shader/x-fragment">
+precision mediump float;
+varying vec4 color;
+void main() {
+  gl_FragColor = color;
+}
+</script>
+<script>
+"use strict";
+description('Test that updating the size of a vertex buffer is properly noticed by the WebGL implementation.')
+
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example");
+var program = wtu.setupProgram(gl, ["vs", "fs"], ["vPosition", "vColor"]);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after initialization");
+
+var vertexObject = gl.createBuffer();
+gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
+gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
+    [-1,1,0, 1,1,0, -1,-1,0,
+     -1,-1,0, 1,1,0, 1,-1,0]), gl.STATIC_DRAW);
+gl.enableVertexAttribArray(0);
+gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after vertex setup");
+
+var texCoordObject = gl.createBuffer();
+gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
+gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
+    [0,0, 1,0, 0,1,
+     0,1, 1,0, 1,1]), gl.STATIC_DRAW);
+gl.enableVertexAttribArray(1);
+gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture coord setup");
+
+// Now resize these buffers because we want to change what we're drawing.
+gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
+gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
+    -1,1,0, 1,1,0, -1,-1,0, 1,-1,0,
+    -1,1,0, 1,1,0, -1,-1,0, 1,-1,0]), gl.STATIC_DRAW);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after vertex redefinition");
+gl.bindBuffer(gl.ARRAY_BUFFER, texCoordObject);
+gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([
+    255, 0, 0, 255,
+    255, 0, 0, 255,
+    255, 0, 0, 255,
+    255, 0, 0, 255,
+    0, 255, 0, 255,
+    0, 255, 0, 255,
+    0, 255, 0, 255,
+    0, 255, 0, 255]), gl.STATIC_DRAW);
+gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, false, 0, 0);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture coordinate / color redefinition");
+
+var numQuads = 2;
+var indices = new Uint8Array(numQuads * 6);
+for (var ii = 0; ii < numQuads; ++ii) {
+    var offset = ii * 6;
+    var quad = (ii == (numQuads - 1)) ? 4 : 0;
+    indices[offset + 0] = quad + 0;
+    indices[offset + 1] = quad + 1;
+    indices[offset + 2] = quad + 2;
+    indices[offset + 3] = quad + 2;
+    indices[offset + 4] = quad + 1;
+    indices[offset + 5] = quad + 3;
+}
+var indexObject = gl.createBuffer();
+gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexObject);
+gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices");
+gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");
+
+debug("")
+var successfullyParsed = true;
+</script>
+
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>