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diff --git a/dom/tests/mochitest/webcomponents/test_shadowroot_clonenode.html b/dom/tests/mochitest/webcomponents/test_shadowroot_clonenode.html
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+++ b/dom/tests/mochitest/webcomponents/test_shadowroot_clonenode.html
@@ -0,0 +1,46 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1429982
+-->
+<head>
+  <title>Test for Bug 1429982</title>
+  <script type="text/javascript" src="head.js"></script>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank"
+  href="https://bugzilla.mozilla.org/show_bug.cgi?id=1429982">Mozilla Bug 1429982</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 1429982 **/
+SimpleTest.waitForExplicitFinish();
+createIframe()
+  .then((aDocument) => {
+    var element = aDocument.createElement("div");
+    var shadowRoot = element.attachShadow({mode: "open"});
+    var thrownException = false;
+
+    try {
+      shadowRoot.cloneNode();
+    } catch(err) {
+      thrownException = err;
+    }
+
+    ok(thrownException !== false, "An exception should've been thrown");
+    is(thrownException.name, "NotSupportedError", "A NotSupportedError exception should've been thrown");
+
+    SimpleTest.finish();
+  });
+</script>
+</pre>
+</body>
+</html>
+