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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/copy-texture-image-luma-format.html b/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/copy-texture-image-luma-format.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/copy-texture-image-luma-format.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 CopyTexSubImage Tests</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>
+<canvas id="canvas" width="64px" height="32px"> </canvas>
+<div id="console"></div>
+<script id="vshader" type="x-shader/x-vertex">#version 300 es
+in highp vec4 a_position;
+in highp vec2 a_coord;
+out highp vec2 v_coord;
+void main(void) {
+    gl_Position = a_position;
+    v_coord = a_coord;
+}
+</script>
+<script id="fshader_luminance_alpha" type="x-shader/x-fragment">#version 300 es
+in highp vec2 v_coord;
+uniform highp sampler3D u_sampler0;
+out highp vec4 o_color0;
+void main (void) {
+    o_color0 = vec4(texture(u_sampler0,vec3(v_coord, 0)));
+}
+</script>
+<script>
+"use strict";
+description("This test verifies the behavior of copTexSubImage3D with luminance textures.");
+debug("");
+
+var wtu = WebGLTestUtils;
+var canvas = document.getElementById("canvas");
+var gl = wtu.create3DContext(canvas, null, 2);
+
+function copytexsubimage3D_luma_format() {
+
+    var testGroup = [
+        {
+            name: '3d_alpha',
+            format: gl.ALPHA,
+            width: 64,
+            height: 32,
+            depth: 2
+        },
+        {
+            name: '3d_luminance',
+            format: gl.LUMINANCE,
+            width: 64,
+            height: 32,
+            depth: 2
+        },
+        {
+            name: '3d_luminance_alpha',
+            format: gl.LUMINANCE_ALPHA,
+            width: 64,
+            height: 32,
+            depth: 2
+        }
+    ];
+
+    testGroup.forEach(function(testcase) {
+        debug("");
+        debug("Testing copytexsubimage3d_luma_format_" + testcase.name);
+
+        var texture = [];
+        texture[0] = gl.createTexture();
+        texture[1] = gl.createTexture();
+        var layer = 0;
+        var width = testcase.width;
+        var height = testcase.height;
+        var depth = testcase.depth;
+        var msg;
+        var uint1 = new Uint8Array(width * height * 4);
+        for (var i = 0; i < uint1.length - 1; ++i) {
+            uint1[i + 1] = (uint1[i] + 10) % 255;
+        }
+
+        gl.bindTexture(gl.TEXTURE_2D, texture[0]);
+        gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, uint1);
+        var fbo = gl.createFramebuffer();
+        gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
+        gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture[0], 0);
+
+        if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) == gl.FRAMEBUFFER_COMPLETE) {
+            gl.bindTexture(gl.TEXTURE_3D, texture[1]);
+            setUpTexStatus();
+            gl.texImage3D(gl.TEXTURE_3D, 0, testcase.format, width, height, depth, 0, testcase.format, gl.UNSIGNED_BYTE, null);
+            gl.copyTexSubImage3D(gl.TEXTURE_3D, 0, 0, 0, layer, 0, 0,width, height);
+            gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+
+            var program = wtu.setupProgram(gl, ["vshader", "fshader_luminance_alpha"], ["a_position", "a_coord"]);
+            wtu.setupUnitQuad(gl, 0, 1);
+            wtu.drawUnitQuad(gl);
+
+            for (var y = 0; y < height; ++y) {
+                for (var x = 0; x < width; ++x) {
+                    var cur = y * width * 4 + x * 4;
+                    if (testcase.format == gl.ALPHA) {
+                        wtu.checkCanvasRect(gl, x, y, 1, 1, [ 0, 0,
+                        0, uint1[cur + 3]], msg, [1, 1, 1, 1]);
+                    } else if (testcase.format == gl.LUMINANCE) {
+                        wtu.checkCanvasRect(gl, x, y, 1, 1, [uint1[cur], uint1[cur],
+                        uint1[cur], 255], msg, [1, 1, 1, 1]);
+                    } else { // gl.LUMINANCE_ALPHA
+                        wtu.checkCanvasRect(gl, x, y, 1, 1, [uint1[cur], uint1[cur],
+                        uint1[cur], uint1[cur + 3]], msg, [1, 1, 1, 1]);
+                    }
+                }
+            }
+        } else {
+            testFailed("framebuffer not complete");
+        }
+
+        gl.bindTexture(gl.TEXTURE_3D, null);
+        gl.bindFramebuffer(gl.FRAMEBUFFER, null);
+        gl.deleteFramebuffer(fbo);
+        gl.deleteTexture(texture[0]);
+        gl.deleteTexture(texture[1]);
+        gl.deleteProgram(program);
+    });
+}
+
+function setUpTexStatus() {
+    gl.texParameteri(
+        gl.TEXTURE_3D, gl.TEXTURE_MIN_FILTER, gl.NEAREST
+    );
+    gl.texParameteri(
+        gl.TEXTURE_3D, gl.TEXTURE_MAG_FILTER, gl.NEAREST
+    );
+    gl.texParameteri(
+        gl.TEXTURE_3D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE
+    );
+    gl.texParameteri(
+        gl.TEXTURE_3D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE
+    );
+    gl.texParameteri(
+        gl.TEXTURE_3D, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE
+    );
+}
+
+if (!gl) {
+    testFailed("WebGL context does not exist");
+} else {
+    testPassed("WebGL context exists");
+    copytexsubimage3D_luma_format();
+}
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>