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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shaders-with-constant-expression-loop-conditions.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shaders-with-constant-expression-loop-conditions.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shaders-with-constant-expression-loop-conditions.html
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+<!--
+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 GLSL Conformance Tests</title>
+<link rel="stylesheet" href="../../../resources/js-test-style.css" />
+<link rel="stylesheet" href="../../../resources/glsl-feature-tests.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="vertexShaderLiteralLoopCondition" type="text/something-not-javascript">
+attribute vec4 a_position;
+void main()
+{
+    for (int i = 0; i < 5 + 5; i++) { }
+    gl_Position = a_position;
+}
+</script>
+<script id="fragmentShaderLiteralLoopCondition" type="text/something-not-javascript">
+void main()
+{
+    for (int i = 0; i < 5 + 5; i++) { }
+    gl_FragColor = vec4(1.0);
+}
+</script>
+<script id="vertexShaderConstVarLoopCondition" type="text/something-not-javascript">
+attribute vec4 a_position;
+void main()
+{
+    // Explicitly constant variables can be part of a constant expression
+    const int constVar = 5;
+    for (int i = 0; i < 5 + constVar; i++) { }
+    gl_Position = a_position;
+}
+</script>
+<script id="fragmentShaderConstVarLoopCondition" type="text/something-not-javascript">
+void main()
+{
+    // Explicitly constant variables can be part of a constant expression
+    const int constVar = 5;
+    for (int i = 0; i < constVar + 5; i++) { }
+    gl_FragColor = vec4(1.0);
+}
+</script>
+<script id="vertexShaderNonConstVarLoopCondition" type="text/something-not-javascript">
+attribute vec4 a_position;
+void main()
+{
+    // Despite assigning a constant and not modifying it, nonConstVar is not semantically a constant expression
+    int nonConstVar = 10;
+    for (int i = 0; i < nonConstVar; i++) { }
+    gl_Position = a_position;
+}
+</script>
+<script id="fragmentShaderNonConstVarLoopCondition" type="text/something-not-javascript">
+void main()
+{
+    // Despite assigning a constant and not modifying it, nonConstVar is not semantically a constant expression
+    int nonConstVar = 10;
+    for (int i = 0; i < nonConstVar; i++) { }
+    gl_FragColor = vec4(1.0);
+}
+</script>
+<script>
+"use strict";
+var wtu = WebGLTestUtils;
+
+var tests = [];
+tests.push({
+    vShaderSource: wtu.getScript("vertexShaderLiteralLoopCondition"),
+    vShaderSuccess: true,
+    fShaderSource: wtu.getScript("fragmentShaderLiteralLoopCondition"),
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "Shaders with literals in the loop condition should compile and link.",
+});
+tests.push({
+    vShaderSource: wtu.getScript("vertexShaderConstVarLoopCondition"),
+    vShaderSuccess: true,
+    fShaderSource: wtu.getScript("fragmentShaderConstVarLoopCondition"),
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "Shaders with constant variables in the loop condition should compile and link.",
+});
+tests.push({
+    vShaderSource: wtu.getScript("vertexShaderNonConstVarLoopCondition"),
+    vShaderSuccess: false,
+    fShaderSource: wtu.getScript("fragmentShaderLiteralLoopCondition"),
+    fShaderSuccess: true,
+    linkSuccess: false,
+    passMsg: "Vertex shader with non-const variable in the loop condition should fail.",
+});
+tests.push({
+    vShaderSource: wtu.getScript("vertexShaderLiteralLoopCondition"),
+    vShaderSuccess: true,
+    fShaderSource: wtu.getScript("fragmentShaderNonConstVarLoopCondition"),
+    fShaderSuccess: false,
+    linkSuccess: false,
+    passMsg: "Fragment shader with non-const variable in the loop condition should fail.",
+});
+
+GLSLConformanceTester.runTests(tests);
+var successfullyParsed = true;
+</script>
+</body>
+</html>