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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/copyTexSubImage2D.html b/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/copyTexSubImage2D.html
new file mode 100644
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/more/functions/copyTexSubImage2D.html
@@ -0,0 +1,121 @@
+<!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">
+
+Tests.startUnit = function () {
+  var canvas = document.getElementById('gl');
+  var gl = wrapGLContext(getGLContext(canvas));
+  return [gl];
+}
+
+Tests.setup = function(gl) {
+  var tex = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_2D, tex);
+  var texCubeMap = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_CUBE_MAP, texCubeMap);
+  return [gl]
+}
+
+Tests.teardown = function(gl,tex,texCubeMap) {
+  gl.bindTexture(gl.TEXTURE_2D, null);
+  gl.bindTexture(gl.TEXTURE_CUBE_MAP, null);
+  gl.deleteTexture(tex);
+  gl.deleteTexture(texCubeMap);
+}
+
+
+Tests.testTexImage2D = function(gl) {
+  gl.copyTexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 0,0,16,16,0);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0,0, 0,0,1,1);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0,0, 0,0,2,1);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0,0, 0,0,1,2);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0,0, 0,0,16,16);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0,0, 15,15,1,1);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 1,1, 0,0,15,15);
+  gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 15,15, 0,0,1,1);
+  var valid_targets = [
+    gl.TEXTURE_2D,
+    gl.TEXTURE_CUBE_MAP_POSITIVE_X,
+    gl.TEXTURE_CUBE_MAP_NEGATIVE_X,
+    gl.TEXTURE_CUBE_MAP_POSITIVE_Y,
+    gl.TEXTURE_CUBE_MAP_NEGATIVE_Y,
+    gl.TEXTURE_CUBE_MAP_POSITIVE_Z,
+    gl.TEXTURE_CUBE_MAP_NEGATIVE_Z
+  ];
+  valid_targets.forEach(function(t) {
+    assertOk(function(){
+        gl.copyTexImage2D(t, 0, gl.RGBA, 0,0,1,1,0);
+        gl.copyTexSubImage2D(t, 0, 0,0,0,0,1,1);
+    });
+  });
+}
+Tests.testRoundtrip = function(gl) {
+    var sh = new Filter(gl, 'identity-flip-vert', 'identity-frag');
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    var buf = new Uint8Array(4);
+    gl.readPixels(0,0,1,1,gl.RGBA, gl.UNSIGNED_BYTE, buf);
+    assertEquals([255,0,0,255], [buf[0], buf[1], buf[2], buf[3]]);
+    // red texture
+    gl.clearColor(0.0, 0.0, 0.0, 0.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, document.getElementById('gl'));
+    gl.clearColor(1.0, 0.0, 0.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    gl.copyTexSubImage2D(gl.TEXTURE_2D, 0, 0,0,0,0,16,16);
+    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);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
+    gl.clearColor(0.0, 0.0, 1.0, 1.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+    // blue framebuffer
+    gl.readPixels(0,0,1,1,gl.RGBA, gl.UNSIGNED_BYTE, buf);
+    assertEquals([0,0,255,255], [buf[0], buf[1], buf[2], buf[3]]);
+    sh.apply(); // paint with texture
+    gl.readPixels(0,0,1,1,gl.RGBA, gl.UNSIGNED_BYTE, buf);
+    assertEquals([255,0,0,255], [buf[0], buf[1], buf[2], buf[3]]);
+    sh.destroy();
+}
+
+Tests.endUnit = function(gl) {
+}
+
+</script>
+<script id="identity-flip-vert" type="x-shader/x-vertex">
+attribute vec3 Vertex;
+attribute vec2 Tex;
+
+varying vec4 texCoord0;
+void main()
+{
+    texCoord0 = vec4(Tex.s, 1.0-Tex.t, 0.0, 0.0);
+    gl_Position = vec4(Vertex, 1.0);
+}
+</script>
+<script id="identity-frag" type="x-shader/x-fragment">
+precision mediump float;
+
+uniform sampler2D Texture;
+
+varying vec4 texCoord0;
+void main()
+{
+    vec4 c = texture2D(Texture, texCoord0.st);
+    gl_FragColor = c;
+}
+</script>
+<style>canvas{ position:absolute; }</style>
+</head><body>
+<canvas id="gl" width="16" height="16"></canvas>
+</body></html>