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<!DOCTYPE html>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=856384
-->
<head>
<meta charset="UTF-8">
<title>Test for Bug 856384</title>
<script type="application/javascript" 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=856384">Mozilla Bug 856384</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<iframe name="constructor" src="about:blank"></iframe>
<pre id="test">
<script type="application/javascript">
SimpleTest.waitForExplicitFinish();
function run()
{
is(Object.isExtensible(window), true, "Windows are extensible by default");
try
{
Object.preventExtensions(window);
throw "didn't throw";
}
catch (e)
{
is(e instanceof TypeError, true,
"preventExtensions(window) should throw a TypeError, instead got: " + e);
is(Object.isExtensible(window), true,
'Windows are extensible after an extensibility "change" attempt');
}
SimpleTest.finish();
}
window.addEventListener("load", run, false);
</script>
</pre>
</body>
</html>
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