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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/programs/active-built-in-attribs.html b/dom/canvas/test/webgl-conf/checkout/conformance2/programs/active-built-in-attribs.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/programs/active-built-in-attribs.html
@@ -0,0 +1,86 @@
+<!--
+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>WebGL Conformance Tests: Verify validation for active built-in attribs</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/desktop-gl-constants.js"></script>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<canvas id="canvas" style="width: 64px; height: 64px;"> </canvas>
+<div id="console"></div>
+<script id="vs" type="x-shader/x-vertex">#version 300 es
+void main() {
+  gl_Position = vec4(gl_VertexID % 2, (gl_VertexID/2) % 2, 0, 1);
+}
+</script>
+
+<script id="fs" type="x-shader/x-fragment">#version 300 es
+precision mediump float;
+out vec4 fragColor;
+void main() {
+  fragColor = vec4(0, 1, 0, 1);
+}
+</script>
+
+<script>
+"use strict";
+description("This test verifies validation for active built-in attribs.");
+
+debug("");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var gl = wtu.create3DContext(canvas, null, 2);
+
+if (!gl) {
+  testFailed("WebGL context does not exist");
+} else {
+  testPassed("WebGL context exists");
+  runTests();
+}
+
+var activeInfo, attribLoc;
+
+function runTests() {
+  var prog = wtu.setupProgram(gl, ["vs", "fs"]);
+  if (!prog) {
+    testFailed("Set up program failed");
+    return;
+  }
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No GL error from set up");
+
+  var numActive = gl.getProgramParameter(prog, gl.ACTIVE_ATTRIBUTES);
+  if (numActive != 1) {
+    testFailed('ACTIVE_ATTRIBUTES should be 1.');
+    return;
+  }
+  testPassed('ACTIVE_ATTRIBUTES should be 1.');
+
+  activeInfo = gl.getActiveAttrib(prog, 0);
+  if (!activeInfo) {
+    testFailed('getActiveAttrib should return an info object.');
+    return;
+  }
+
+  shouldBe('activeInfo.name', '"gl_VertexID"');
+  attribLoc = gl.getAttribLocation(prog, 'gl_VertexID');
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to request the location of a built-in.");
+  shouldBe('attribLoc', '-1');
+}
+
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>