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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/cube-incomplete-fbo.html b/dom/canvas/test/webgl-conf/checkout/conformance/textures/misc/cube-incomplete-fbo.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>Test that cube incomplete textures can not be used as FBO attachments</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="24" height="24"></canvas>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+
+var wtu = WebGLTestUtils;
+description();
+
+var gl = wtu.create3DContext("example");
+
+var testIncompleteCubemapFaceInFBO = function() {
+    // Create a cube map texture that's not cube complete.
+    var tex2 = gl.createTexture();
+    gl.bindTexture(gl.TEXTURE_CUBE_MAP, tex2);
+    gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
+    gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
+
+    var cube_map_faces = [
+        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
+    ];
+    // Fill in all but 1 cube map face
+    for (var i = 0; i < cube_map_faces.length - 1; ++i) {
+        gl.texImage2D(cube_map_faces[i], 0, gl.RGBA, 32, 32, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+    }
+
+    var fb2 = gl.createFramebuffer();
+    gl.bindFramebuffer(gl.FRAMEBUFFER, fb2);
+    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_CUBE_MAP_POSITIVE_X, tex2, 0);
+    wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors after attaching cube map face.");
+    debug("Cubemap has 1 missing face, so framebuffer should not be complete.");
+    shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_INCOMPLETE_ATTACHMENT");
+
+    debug("");
+
+    // Fill in missing cube map face
+    gl.texImage2D(cube_map_faces[5], 0, gl.RGBA, 32, 32, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+    debug("Missing face is added, so framebuffer should become complete.");
+    shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
+}
+
+testIncompleteCubemapFaceInFBO();
+
+var successfullyParsed = true;
+finishTest();
+
+</script>
+
+</body>
+</html>
+