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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/extensions/webgl-compressed-texture-etc1.html b/dom/canvas/test/webgl-conf/checkout/conformance/extensions/webgl-compressed-texture-etc1.html
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance/extensions/webgl-compressed-texture-etc1.html
@@ -0,0 +1,74 @@
+<!--
+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 WEBGL_compressed_texture_etc1 Conformance 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>
+<script src="../../js/tests/compressed-texture-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description("This test verifies the functionality of the WEBGL_compressed_texture_etc1 extension, if it is available.");
+
+debug("");
+
+var validFormats = {
+  COMPRESSED_RGB_ETC1_WEBGL: 0x8D64,
+};
+
+function expectedByteLength(width, height, format) {
+  return Math.floor((width + 3) / 4) * Math.floor((height + 3) / 4) * 8;
+}
+
+function getBlockDimensions(format) {
+  return {width: 4, height: 4};
+}
+
+var wtu = WebGLTestUtils;
+var ctu = CompressedTextureUtils;
+var contextVersion = wtu.getDefault3DContextVersion();
+var gl = wtu.create3DContext();
+var WEBGL_compressed_texture_etc1;
+
+var formats = null;
+
+function runTest() {
+  if (!gl) {
+    testFailed("context does not exist");
+  } else {
+    testPassed("context exists");
+
+    ctu.testCompressedFormatsUnavailableWhenExtensionDisabled(gl, validFormats, expectedByteLength, 4);
+
+    WEBGL_compressed_texture_etc1 = gl.getExtension("WEBGL_compressed_texture_etc1");
+
+    wtu.runExtensionSupportedTest(gl, "WEBGL_compressed_texture_etc1", WEBGL_compressed_texture_etc1 !== null);
+
+    if (WEBGL_compressed_texture_etc1 !== null) {
+      // Test that enum values are listed correctly in supported formats and in the extension object.
+      ctu.testCompressedFormatsListed(gl, validFormats);
+      ctu.testCorrectEnumValuesInExt(WEBGL_compressed_texture_etc1, validFormats);
+      // Test that texture upload buffer size is validated correctly.
+      ctu.testFormatRestrictionsOnBufferSize(gl, validFormats, expectedByteLength, getBlockDimensions);
+    }
+  }
+}
+
+runTest();
+
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+</body>
+</html>