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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>Positive tests for the use of the invariant qualifier and pragma</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="vertexShaderInvariant" type="text/something-not-javascript">#version 300 es
+precision mediump float;
+invariant out vec4 v_varying;
+
+void main()
+{
+    v_varying = vec4(0.0, 0.0, 0.0, 1.0);
+    gl_Position = v_varying;
+}
+</script>
+<script id="vertexShaderSeparateInvariant" type="text/something-not-javascript">#version 300 es
+precision mediump float;
+out vec4 v_varying;
+invariant v_varying;
+
+void main()
+{
+    v_varying = vec4(0.0, 0.0, 0.0, 1.0);
+    gl_Position = v_varying;
+}
+</script>
+<script id="vertexShaderGlobalInvariant" type="text/something-not-javascript">#version 300 es
+#pragma STDGL invariant(all)
+precision mediump float;
+out vec4 v_varying;
+
+void main()
+{
+    v_varying = vec4(0.0, 0.0, 0.0, 1.0);
+    gl_Position = v_varying;
+}
+</script>
+<script id="fragmentShaderVariant" type="text/something-not-javascript">#version 300 es
+precision mediump float;
+
+in vec4 v_varying;
+out vec4 my_color;
+
+void main()
+{
+    my_color = v_varying;
+}
+</script>
+<script type="application/javascript">
+"use strict";
+description();
+GLSLConformanceTester.runTests([
+  {
+    vShaderId: "vertexShaderInvariant",
+    vShaderSuccess: true,
+    fShaderId: "fragmentShaderVariant",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "vertex shader with invariant varying and fragment shader with variant varying must succeed",
+  },
+  {
+    vShaderId: "vertexShaderGlobalInvariant",
+    vShaderSuccess: true,
+    fShaderId: "fragmentShaderVariant",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "vertex shader with invariant (global setting) varying and fragment shader with variant varying must succeed",
+  },
+  {
+    vShaderId: "vertexShaderSeparateInvariant",
+    vShaderSuccess: true,
+    fShaderId: "fragmentShaderVariant",
+    fShaderSuccess: true,
+    linkSuccess: true,
+    passMsg: "vertex shader with invariant (separately set) varying and fragment shader with variant varying must succeed",
+  },
+], 2);
+</script>
+</body>
+</html>