File: test_custom_element.html

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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>