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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/tex-3d-mipmap-levels-intel-bug.html b/dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/tex-3d-mipmap-levels-intel-bug.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>WebGL2 3D texture mipmap level conformance 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="2" height="2" style="width: 2px; height: 2px;"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script id="vshader_texsize" type="x-shader/x-vertex">#version 300 es
+in vec4 vPosition;
+void main()
+{
+    gl_Position = vPosition;
+}
+</script>
+
+<script id="fshader_texsize_3d" type="x-shader/x-fragment">#version 300 es
+precision mediump float;
+uniform highp sampler3D tex;
+uniform int lod;
+uniform ivec3 texSize;
+out vec4 fragColor;
+void main()
+{
+    fragColor = (textureSize(tex, lod) == texSize ? vec4(255, 0, 0, 255) : vec4(0, 0, 0, 255));
+}
+</script>
+
+
+<script>
+"use strict";
+description(document.title);
+var wtu = WebGLTestUtils;
+var gl = wtu.create3DContext("example", undefined, 2);
+
+wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors from setup.");
+
+// This test fails on Intel Mesa, see crbug.com/666384.
+(function() {
+  debug("");
+  debug("Test textureSize should work correctly with non-zero base level for texStorage3D");
+  var program = wtu.setupProgram(
+      gl, ['vshader_texsize', 'fshader_texsize_3d'], ['vPosition'], [0]);
+  wtu.setupUnitQuad(gl, 0, 1);
+
+  gl.uniform1i(gl.getUniformLocation(program, "tex"), 0);
+  gl.uniform1i(gl.getUniformLocation(program, "lod"), 1);
+  gl.uniform3i(gl.getUniformLocation(program, "texSize"), 8, 4, 2);
+  var tex3d = gl.createTexture();
+  gl.bindTexture(gl.TEXTURE_3D, tex3d);
+  gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texParameter(TEXTURE_MAG_FILTER) should succeed");
+  gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texParameter(TEXTURE_MIN_FILTER) should succeed");
+  gl.texParameteri(gl.TEXTURE_3D, gl.TEXTURE_BASE_LEVEL, 1);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texParameter(TEXTURE_BASE_LEVEL) should succeed");
+  gl.texStorage3D(gl.TEXTURE_3D, 4, gl.RGBA8, 32, 16, 8);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "texStorage3D should succeed");
+  wtu.clearAndDrawUnitQuad(gl);
+  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearAndDrawQuad should succeed");
+  wtu.checkCanvas(gl, [255, 0, 0, 255], "should draw with [255, 0, 0, 255]");
+  gl.deleteTexture(tex3d);
+})();
+
+var successfullyParsed = true;
+
+</script>
+<script src="../../../js/js-test-post.js"></script>
+
+</body>
+</html>