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+<!DOCTYPE html>
+<html>
+ <head>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ </head>
+ <body onload="startTests()">
+ <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=783129" target="_blank">Mozilla Bug 783129</a>
+ <iframe id="fooframe" src="/"></iframe>
+ <script type="application/javascript">
+
+ /** Test for Bug 783129 **/
+ SimpleTest.waitForExplicitFinish();
+
+ function startTests() {
+ var frame = document.getElementById("fooframe");
+ class XFoo extends frame.contentWindow.HTMLElement {};
+ frame.contentWindow.customElements.define("x-foo", XFoo);
+ var elem = new XFoo();
+ is(elem.tagName, "X-FOO", "Constructor should create an x-foo element.");
+
+ var anotherElem = $("fooframe").contentDocument.createElement("x-foo");
+ is(anotherElem.tagName, "X-FOO", "createElement should create an x-foo element.");
+ SimpleTest.finish();
+ }
+
+ </script>
+ </body>
+</html>