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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 the max advertized texture size is supported.</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 vec4 vPosition;
+attribute vec2 texCoord0;
+varying vec2 texCoord;
+void main()
+{
+    gl_Position = vPosition;
+    texCoord = texCoord0;
+}
+</script>
+
+<script id="fshader" type="x-shader/x-fragment">
+precision mediump float;
+uniform samplerCube tex;
+varying vec2 texCoord;
+void main()
+{
+    gl_FragColor = textureCube(tex, normalize(vec3(texCoord, 1)));
+}
+</script>
+<script>
+"use strict";
+description(document.title);
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example");
+var program = wtu.setupTexturedQuad(gl);
+
+function shouldBePowerOfTwo(n, name) {
+    var power = Math.round(Math.log(n) / Math.log(2));
+    if (Math.pow(2, power) == n) {
+        testPassed(name + ' is a power of two.');
+    } else {
+        testFailed(name + ' should be a power of two, but was ' + n);
+    }
+}
+
+// Note: It seems like a reasonable assuption that a 1xN texture size should
+// work. Even 1 by 128k is only 512k
+var maxSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);
+debug("advertised max size: " + maxSize);
+debug("verifying max size is power-of-two (implied by GLES 2.0 section 3.7.1)");
+shouldBePowerOfTwo(maxSize, 'Max size');
+var testSize = Math.min(maxSize, 128 * 1024);
+var pixels = new Uint8Array(testSize * 4);
+for (var ii = 0; ii < testSize; ++ii) {
+  var off = ii * 4;
+  pixels[off + 0] = 0;
+  pixels[off + 1] = 255;
+  pixels[off + 2] = 128;
+  pixels[off + 3] = 255;
+}
+var tex = gl.createTexture();
+gl.bindTexture(gl.TEXTURE_2D, tex);
+
+debug("test " + testSize + "x1");
+gl.texImage2D(
+    gl.TEXTURE_2D, 0, gl.RGBA, testSize, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
+    pixels);
+gl.generateMipmap(gl.TEXTURE_2D);
+
+wtu.clearAndDrawUnitQuad(gl);
+wtu.checkCanvas(gl, [0, 255, 128, 255],
+                "Should be 0, 255, 128, 255");
+debug("test 1x" + testSize);
+gl.texImage2D(
+    gl.TEXTURE_2D, 0, gl.RGBA, 1, testSize, 0, gl.RGBA, gl.UNSIGNED_BYTE,
+    pixels);
+gl.generateMipmap(gl.TEXTURE_2D);
+
+wtu.clearAndDrawUnitQuad(gl);
+wtu.checkCanvas(gl, [0, 255, 128, 255],
+                "Should be 0, 255, 128, 255");
+
+var program = wtu.setupProgram(
+    gl, ['vshader', 'fshader'], ['vPosition', 'texCoord0'], [0, 1]);
+
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors.");
+
+// NOTE: We can't easily test cube maps because they require width == height
+// and we might not have enough memory for maxSize by maxSize texture.
+
+var successfullyParsed = true;
+
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>
+
+