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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/readPixelsBadArgs.html b/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/readPixelsBadArgs.html
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@@ -0,0 +1,113 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<!--
+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.
+-->
+<link rel="stylesheet" type="text/css" href="../unit.css" />
+<script type="application/javascript" src="../unit.js"></script>
+<script type="application/javascript" src="../util.js"></script>
+<script type="application/javascript" src="../../../js/webgl-test-utils.js"></script>
+</head><body>
+<canvas id="gl" width="16" height="16"></canvas>
+<canvas id="c" width="128" height="128"></canvas>
+<img id="i">
+<script type="application/javascript">
+var wtu = WebGLTestUtils;
+var defaultImgUrl = "https://get.webgl.org/conformance-resources/opengl_logo.jpg";
+var localImgUrl = "../../../resources/opengl_logo.jpg";
+
+Tests.autoinit = false; // Prevents the test from running until the image is loaded
+
+Tests.startUnit = function () {
+  var canvas = document.getElementById('gl');
+  var gl = wrapGLContext(getGLContext(canvas));
+  return [gl];
+}
+
+Tests.testReadPixels = function(gl) {
+  // we can't know if this is going to fail because of negative width
+  // or because the buffer size doesn't match the dimensions.
+  assertSomeGLError(gl, "negative width",
+      function(){gl.readPixels(0,0,-1,1, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(4));});
+  assertSomeGLError(gl,  "negative height",
+      function(){gl.readPixels(0,0,1,-1, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(4));});
+  assertOk("negative x",
+      function(){gl.readPixels(-1,0,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(4));});
+  assertOk("negative y",
+      function(){gl.readPixels(0,-1,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(4));});
+  assertOk("height > backbuffer height",
+      function(){gl.readPixels(0,0,16,17, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(16*17*4));});
+  assertOk("width > backbuffer width",
+      function(){gl.readPixels(0,0,17,16, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(17*16*4));});
+  assertOk("width, height = 0",
+      function(){gl.readPixels(0,0,0,0, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(0));});
+  // we can't know if this is going to fail because of negative width
+  // or because the buffer size doesn't match the dimensions.
+  assertSomeGLError(gl, "bad format",
+      function(){gl.readPixels(0,0,1,1, gl.FLOAT, gl.UNSIGNED_BYTE,
+          new Uint8Array(4*4));});
+  // we can't know if this is going to fail because of negative width
+  // or because the buffer size doesn't match the dimensions.
+  assertSomeGLError(gl, "bad type",
+      function(){gl.readPixels(0,0,1,1, gl.ALPHA, gl.FLOAT,
+          new Uint8Array(1*4));});
+}
+
+Tests.testReadPixelsSOPIMG = function(gl) {
+    var img = document.getElementById("i");
+    var tex = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, tex);
+    // SOP failure
+    assertThrowNoGLError(gl, "throw because img is from another domain",
+      function(){gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, img);});
+    gl.bindTexture(gl.TEXTURE_2D, null);
+    assertOk("canvas still origin-clean",
+      function(){gl.readPixels(0,0,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(4));});
+    gl.deleteTexture(tex);
+}
+Tests.testReadPixelsSOPCanvas = function(gl) {
+    var img = document.getElementById("i");
+    var c = document.getElementById("c");
+    c.getContext("2d").drawImage(img, 0, 0);
+    assertFail("canvas throws because not origin clean",
+      function(){c.getContext("2d").getImageData(0,0,1,1);});
+    var tex = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_2D, tex);
+    // SOP failure
+    assertThrowNoGLError(gl, "throw because canvas is not origin clean",
+      function(){gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, c);});
+    gl.bindTexture(gl.TEXTURE_2D, null);
+    assertOk("canvas still origin-clean",
+      function(){gl.readPixels(0,0,1,1, gl.RGBA, gl.UNSIGNED_BYTE,
+          new Uint8Array(4));});
+    gl.deleteTexture(tex);
+}
+
+Tests.endUnit = function(gl) {
+};
+
+(async function() {
+  const img = document.getElementById('i');
+  try {
+    await wtu.awaitOrTimeout(wtu.loadCrossOriginImage(img, defaultImgUrl, localImgUrl));
+  } catch (e) {
+    testFailed(`Image setup failed (${e}).`);
+    finishTest();
+    return;
+  }
+  initTests();
+})();
+</script>
+</body></html>