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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/forward-declaration.html b/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/forward-declaration.html
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index 0000000000..b3afcb846d
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/glsl3/forward-declaration.html
@@ -0,0 +1,90 @@
+<!--
+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>GLSL 3.00 forward declaration 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>
+<script src="../../js/glsl-conformance-test.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vertexShaderForwardDecl" type="x-shader/x-vertex">#version 300 es
+precision mediump float;
+
+// Forward declaration. Breaks on Pixel C due to flattening of
+// precision qualifiers. It seems the GLSL compiler can't handle the
+// precision qualifier on the return value.
+float identity(float val);
+
+float identity(float val) {
+  return val;
+}
+
+void main(void) {
+    gl_Position = vec4(identity(1.0), 0.0, 0.0, 1.0);
+}
+</script>
+<script id="vertexShader" type="x-shader/x-vertex">#version 300 es
+void main(void) {
+    gl_Position = vec4(1.0, 0.0, 0.0, 1.0);
+}
+</script>
+<script id="fragmentShader" type="x-shader/x-fragment">#version 300 es
+precision mediump float;
+
+out vec4 my_FragColor;
+void main(void) {
+  my_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
+}
+</script>
+<script id="fragmentShaderForwardDecl" type="x-shader/x-fragment">#version 300 es
+precision mediump float;
+
+// Forward declaration. Breaks on Pixel C due to flattening of
+// precision qualifiers. It seems the GLSL compiler can't handle the
+// precision qualifier on the return value.
+float identity(float val);
+
+float identity(float val) {
+  return val;
+}
+
+out vec4 my_FragColor;
+void main(void) {
+  my_FragColor = vec4(0.0, identity(1.0), 0.0, 1.0);
+}
+</script>
+<script type="application/javascript">
+"use strict";
+description("Forward declarations of functions should succeed.");
+
+GLSLConformanceTester.runTests([
+  {
+    vShaderId: "vertexShaderForwardDecl",
+    vShaderSuccess: true,
+    fShaderId: "fragmentShader",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "vertex shader with forward declaration must pass",
+  },
+  {
+    vShaderId: "vertexShader",
+    vShaderSuccess: true,
+    fShaderId: "fragmentShaderForwardDecl",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "fragment shader with forward declaration must pass",
+  },
+], 2);
+</script>
+</body>
+</html>