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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/variables/gl-frontfacing.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/variables/gl-frontfacing.html
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index 0000000000..1716161bcf
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/variables/gl-frontfacing.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>gl-fragcoord Test</title>
+<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="32" height="32">
+</canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+attribute vec4 vPosition;
+void main()
+{
+  gl_Position = vPosition;
+}
+</script>
+
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+void main()
+{
+  gl_FragColor = vec4(
+      gl_FrontFacing ? 1.0 : 0.0,
+      gl_FrontFacing ? 0.0 : 1.0,
+      0,
+      1);
+}
+</script>
+
+<script>
+"use strict";
+function init()
+{
+  description("tests gl_FrontFacing");
+
+  var wtu = WebGLTestUtils;
+  var gl = wtu.create3DContext("example");
+  var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
+
+  var gridRes = 4;
+  wtu.setupIndexedQuad(gl, gridRes, 0, true);
+
+  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+  gl.drawElements(gl.TRIANGLES, gridRes * gridRes * 6, gl.UNSIGNED_SHORT, 0);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no errors from draw");
+
+  var step = 32 / gridRes;
+  var halfStep = step / 2;
+  var quarterStep = halfStep / 2;
+  for (var xx = 0; xx < 32; xx += step) {
+    for (var yy = 0; yy < 32; yy += step) {
+      for (var ii = 0; ii < 2; ++ii) {
+        var color = [
+            ii == 0 ? 255 : 0,
+            ii == 0 ? 0 : 255,
+            0
+        ];
+        var msg = "should be " + color;
+        wtu.checkCanvasRect(
+            gl,
+            xx + quarterStep + halfStep * ii,
+            yy + quarterStep + halfStep * ii,
+            1, 1, color, msg, 4);
+      }
+    }
+  }
+}
+
+init();
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>