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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 cube map out of order upload 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>
+<div id="description"></div>
+<div id="console"></div>
+<canvas id="example" width="64" height="64">
+</canvas>
+<script>
+"use strict";
+description("Test out of order cube map uploads.");
+debug("Regression test for crbug.com/473739 / Apple Radar 20444072.");
+
+<!-- Thanks to Gregg Tavares for the original report and test case. -->
+
+var wtu = WebGLTestUtils;
+
+var canvas = document.getElementById("example");
+canvas.addEventListener('webglcontextlost', contextLost, false);
+
+var contextWasLost = false;
+
+function contextLost(e) {
+  e.preventDefault();
+  contextWasLost = true;
+  debug("***context lost -- should not happen***");
+}
+
+var dataWidth = 256;
+var dataHeight = 256;
+var gl = wtu.create3DContext(canvas);
+var tex = gl.createTexture();
+// start with 1x1 pixel cubemap
+gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);
+var color = new Uint8Array([128, 192, 255, 255]);
+for (var ii = 0; ii < 6; ++ii) {
+    gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X + ii, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, color);
+}
+gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);
+gl.generateMipmap(gl.TEXTURE_CUBE_MAP); // there's no need to call this but the code doesn't check the size.
+
+var textureData = new Uint8Array(dataWidth * dataHeight * 4);
+
+// The first texture has downloaded
+var first = 1;
+gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);
+gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X + first, 0, gl.RGBA, dataWidth, dataHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, textureData);
+
+// Now because the first face downloaded doesn't match the other 5 faces upload the same image to the other 5
+// 1x1 faces
+for (var ii = 0; ii < 6; ++ii) {
+    if (ii !== first) {
+        gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);
+        gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X + ii, 0, gl.RGBA, dataWidth, dataHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, textureData);
+    }
+}
+gl.generateMipmap(gl.TEXTURE_CUBE_MAP);
+
+// Now as each new face comes in add it
+for (var ii = 0; ii < 6; ++ii) {
+    if (ii !== first) {
+        gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex);
+        gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X + ii, 0, gl.RGBA, dataWidth, dataHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, textureData);
+        gl.generateMipmap(gl.TEXTURE_CUBE_MAP);
+    }
+}
+
+gl.flush();
+
+setTimeout(function() {
+  shouldBe("contextWasLost", "false");
+  finishTest();
+}, 1000);
+
+var successfullyParsed = true;
+</script>
+</body>
+</html>