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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/texture-copying-feedback-loops.html b/dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/texture-copying-feedback-loops.html
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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 Texture Copying Feedback Loops 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="1" height="1" style="width: 40px; height: 40px;"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+
+<script>
+"use strict";
+description("Checks that texture copying feedback loops fail correctly.");
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example");
+
+var texture = gl.createTexture();
+gl.bindTexture(gl.TEXTURE_2D, texture);
+gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+
+var texture2 = gl.createTexture();
+gl.bindTexture(gl.TEXTURE_2D, texture2);
+gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
+gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
+
+var framebuffer = gl.createFramebuffer();
+gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);
+gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
+assertMsg(gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE,
+    "framebuffer should be FRAMEBUFFER_COMPLETE.");
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setup");
+
+debug("");
+debug("testing copyTexImage2D");
+gl.bindTexture(gl.TEXTURE_2D, texture);
+gl.copyTexImage2D(gl.TEXTURE_2D, 1, gl.RGBA, 0, 0, 2, 2, 0);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR,
+    "after copyTexImage2D to same texture but different level");
+gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 2, 2, 0);
+wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
+    "after copyTexImage2D to same texture same level, invalid feedback loop");
+gl.bindTexture(gl.TEXTURE_2D, texture2);
+gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0, 0, 2, 2, 0);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR,
+    "after copyTexImage2D to different texture");
+
+debug("");
+debug("testing copyTexSubImage2D");
+gl.bindTexture(gl.TEXTURE_2D, texture);
+gl.copyTexSubImage2D(gl.TEXTURE_2D, 1, 0, 0, 0, 0, 1, 1);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR,
+    "after copyTexSubImage2D to same texture but different level");
+gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);
+wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION,
+    "after copyTexSubImage2D to same texture same level, invalid feedback loop");
+gl.bindTexture(gl.TEXTURE_2D, texture2);
+gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 0, 0, 1, 1);
+wtu.glErrorShouldBe(gl, gl.NO_ERROR,
+    "after copyTexSubImage2D to different texture");
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>