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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/invariant-does-not-leak-across-shaders.html b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/invariant-does-not-leak-across-shaders.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/glsl/bugs/invariant-does-not-leak-across-shaders.html
@@ -0,0 +1,74 @@
+<!--
+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>Invariant does not leak across shaders</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="InvariantVertex" type="x-shader/x-vertex">
+varying vec4 v_varying;
+invariant v_varying;
+
+void main()
+{
+    gl_Position = v_varying;
+}
+</script>
+<script id="InvariantFragment" type="x-shader/x-fragment">
+precision mediump float;
+invariant varying vec4 v_varying;
+
+void main()
+{
+    gl_FragColor = v_varying;
+}
+</script>
+<script id="VertexWithVarying" type="x-shader/x-vertex">
+varying vec4 v_varying;
+
+void main() {
+    gl_Position = v_varying;
+}
+</script>
+<script type="text/javascript">
+"use strict";
+description("The use of the invariant qualifier in one shader must not affect other shaders.");
+
+debug("");
+debug("This is a deliberate subset of conformance/glsl/misc/shaders-with-invariance.html.");
+debug("Compared with the original tests, order of the tests is different.");
+debug("This test covers an ANGLE bug. See crbug.com/634813.");
+
+GLSLConformanceTester.runTests([
+  {
+    vShaderId: "InvariantVertex",
+    vShaderSuccess: true,
+    fShaderId: "InvariantFragment",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "Shaders using invariant qualifier should compile and link."
+  },
+  {
+    vShaderId: "VertexWithVarying",
+    vShaderSuccess: true,
+    fShaderId: "InvariantFragment",
+    fShaderSuccess: true,
+    linkSuccess: false,
+    passMsg: "vertex shader with variant varying and fragment shader with invariant varying must fail"
+  },
+]);
+</script>
+</body>
+</html>