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diff --git a/dom/tests/mochitest/webcomponents/test_custom_element_htmlconstructor_chrome.html b/dom/tests/mochitest/webcomponents/test_custom_element_htmlconstructor_chrome.html
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+++ b/dom/tests/mochitest/webcomponents/test_custom_element_htmlconstructor_chrome.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1274159
+-->
+<head>
+  <title>Test HTMLConstructor for custom elements.</title>
+  <script type="text/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1274159">Bug 1274159</a>
+<script type="text/javascript">
+function test_with_new_window(f) {
+  return new Promise((aResolve) => {
+    let iframe = document.createElement('iframe');
+    iframe.setAttribute('type', 'content');
+    iframe.setAttribute('src', 'http://example.org/tests/dom/tests/mochitest/webcomponents/dummy_page.html');
+    iframe.onload = function() {
+      f(iframe.contentWindow);
+      aResolve();
+    };
+    document.body.appendChild(iframe);
+  });
+}
+
+var Cu = Components.utils;
+var promises = [];
+SimpleTest.waitForExplicitFinish();
+</script>
+<!-- Test cases for autonomous element -->
+<script type="text/javascript" src="htmlconstructor_autonomous_tests.js"></script>
+<!-- Test cases for customized built-in element -->
+<script type="text/javascript" src="htmlconstructor_builtin_tests.js"></script>
+<script type="text/javascript">
+Promise.all(promises).then(() => {
+  SimpleTest.finish();
+});
+</script>
+</body>
+</html>