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+<!--
+
+/*
+** Copyright (c) 2012 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebGL Re-Compile and Re-link Shader conformance test.</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>
+</head>
+<body>
+<canvas id="example" width="4" height="4" style="width: 40px; height: 30px;"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">
+attribute float column;
+attribute float height;
+uniform float position;
+void main() {
+  gl_Position = vec4(mod(column - position, 1.0) * 2.0 - 1.0, height, 0, 1);
+}
+</script>
+
+<script id="fshader1" type="x-shader/x-fragment">
+precision mediump float;
+void main() {
+  gl_FragColor = vec4(1,0,0,1);
+}
+</script>
+<script id="fshader2" type="x-shader/x-fragment">
+precision mediump float;
+uniform float foobar;
+void main() {
+  gl_FragColor = vec4(1,0,foobar,1);
+}
+</script>
+<script id="vshaderB" type="not-js">
+attribute vec2 position;
+varying vec2 v_texCoord;
+void main() {
+  gl_Position = vec4(position, 0, 1);
+  v_texCoord = vec2(position * 0.5 + 0.5);
+}
+</script>
+<script id="fshaderB" type="not-js">
+precision mediump float;
+varying vec2 v_texCoord;
+uniform sampler2D tex;
+void main() {
+  gl_FragColor = texture2D(tex, v_texCoord);
+}
+</script>
+
+<script>
+"use strict";
+description(document.title);
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example");
+
+var vsSource = document.getElementById("vshader").text;
+var fs1Source = document.getElementById("fshader1").text;
+var fs2Source = document.getElementById("fshader2").text;
+
+var vsSourceB = document.getElementById("vshaderB").text;
+var fsSourceB = document.getElementById("fshaderB").text;
+
+var vShader = gl.createShader(gl.VERTEX_SHADER);
+var fShader = gl.createShader(gl.FRAGMENT_SHADER);
+
+var vShaderB = gl.createShader(gl.VERTEX_SHADER);
+var fShaderB = gl.createShader(gl.FRAGMENT_SHADER);
+
+var program = gl.createProgram();
+var programB = gl.createProgram();
+
+gl.attachShader(program, vShader);
+gl.attachShader(program, fShader);
+
+gl.attachShader(programB, vShaderB);
+gl.attachShader(programB, fShaderB);
+
+var success;
+var shader;
+
+function checkShaderStatus(s) {
+  shader = s;
+  shouldBeTrue("success = gl.getShaderParameter(shader, gl.COMPILE_STATUS)");
+  if (!success) {
+    debug("error: " + gl.getShaderInfoLog());
+  }
+}
+
+var prg;
+function checkProgramStatus(p) {
+  prg = p;
+  shouldBeTrue("success = gl.getProgramParameter(prg, gl.LINK_STATUS)");
+  if (!success) {
+    debug("error: " + gl.getProgramInfoLog(prg));
+  }
+}
+
+for (var i = 0; i < 10; ++i) {
+  gl.shaderSource(vShader, vsSource);
+  gl.compileShader(vShader);
+  checkShaderStatus(vShader)
+  gl.shaderSource(fShader, fs1Source);
+  gl.compileShader(fShader);
+  checkShaderStatus(fShader)
+
+  gl.linkProgram(program);
+  checkProgramStatus(program)
+  gl.useProgram(program);
+
+  gl.shaderSource(vShaderB, vsSourceB);
+  gl.compileShader(vShaderB);
+  checkShaderStatus(vShaderB)
+  gl.shaderSource(fShaderB, fsSourceB);
+  gl.compileShader(fShaderB);
+  checkShaderStatus(fShaderB)
+
+  gl.linkProgram(programB);
+  checkProgramStatus(programB)
+
+  gl.useProgram(programB);
+}
+
+for (var i = 0; i < 10; ++i) {
+  // Now change the fragment shader
+  gl.shaderSource(fShader, fs2Source);
+  gl.compileShader(fShader);
+  checkShaderStatus(fShader)
+
+  // And re-link
+  gl.linkProgram(program);
+  checkProgramStatus(program)
+}
+
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors");
+
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>