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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shader-with-long-line.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shader-with-long-line.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/misc/shader-with-long-line.html
@@ -0,0 +1,67 @@
+<!--
+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="fshaderWithLongLine" type="text/something-not-javascript">
+precision mediump float;
+uniform float fooo;
+#if defined(someSymbolNotDefined)
+#error long
+#endif
+void main()
+{
+    gl_FragColor = vec4(fooo+fooo+fooo+fooo, fooo+fooo+fooo+fooo, fooo+fooo+fooo+fooo, 1.0);
+}
+</script>
+<script>
+"use strict";
+description("checks shader with long line succeeds");
+
+var wtu = WebGLTestUtils;
+GLSLConformanceTester.runTests([
+    {
+      fShaderId: 'fshaderWithLongLine',
+      fShaderSuccess: true,
+      fShaderPrep: function(str) {
+        function expand(str, re, replacement, count) {
+          for (var ii = 0; ii < count; ++ii) {
+            str = str.replace(re, replacement);
+          }
+          return str;
+        }
+        str = expand(str, new RegExp(" ", 'g'), "  ", 12);
+        var manyZeros = expand("0", new RegExp("0", 'g'), "00", 8).substring(2);
+        str = expand(str, new RegExp("0", 'g'), manyZeros, 1);
+        str = expand(str, new RegExp("fooo", 'g'), "fooofooo", 6);
+        str = expand(str, new RegExp("long", 'g'), "longlong", 6);
+        //debug("len:" + str.length);
+        //debug(str);
+        return str;
+      },
+      linkSuccess: true,
+      passMsg: 'shader that uses long lines should succeed',
+    }
+  ]);
+
+debug("");
+var successfullyParsed = true;
+
+</script>
+</body>
+</html>