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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="fragmentShader" type="text/something-not-javascript">
+// fragment shader with static assignment to both gl_FragData[0] and gl_FragColor should fail.
+// GLES spec section 3.8.2 subsection Shader Outputs.
+precision mediump float;
+
+void main()
+{
+ gl_FragData[0] = vec4(1, 0, 0, 1);
+ gl_FragColor = vec4(0, 1, 0, 1);
+}
+</script>
+<script>
+"use strict";
+GLSLConformanceTester.runTest();
+var successfullyParsed = true;
+</script>
+</body>
+</html>