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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/variables/gl-fragcoord.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/variables/gl-fragcoord.html
new file mode 100644
index 0000000000..e5f6e27537
--- /dev/null
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/variables/gl-fragcoord.html
@@ -0,0 +1,84 @@
+<!--
+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(
+      floor(gl_FragCoord.x * 4.0 / 32.0) / 4.0,
+      floor(gl_FragCoord.y * 4.0 / 32.0) / 4.0,
+      floor(gl_FragCoord.z * 4.0) / 4.0,
+      1);
+}
+</script>
+
+<script>
+"use strict";
+function init()
+{
+  description("tests gl_FragCoord");
+
+  var wtu = WebGLTestUtils;
+  var gl = wtu.create3DContext("example");
+  var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]);
+
+  var vertexObject = gl.createBuffer();
+  gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
+  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(
+      [-1, -1, -1,  1, -1,  0, -1,  1,  0,
+       -1,  1,  0,  1, -1,  0,  1,  1,  1]),
+      gl.STATIC_DRAW);
+  gl.enableVertexAttribArray(0);
+  gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
+
+  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+  gl.drawArrays(gl.TRIANGLES, 0, 6);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "no errors from draw");
+
+  for (var xx = 0; xx < 32; xx += 4) {
+    for (var yy = 0; yy < 32; yy += 4) {
+      var zz = (xx / 64) + (yy / 64);
+      var color = [
+        Math.floor(Math.floor(xx * 4.0 / 32.0) / 4 * 256),
+        Math.floor(Math.floor(yy * 4.0 / 32.0) / 4 * 256),
+        Math.floor(Math.floor(zz * 4.0) / 4 * 256)
+      ];
+      var msg = "should be " + color;
+      wtu.checkCanvasRect(gl, xx, yy, 1, 1, color, msg, 4);
+    }
+  }
+}
+
+init();
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>