<body>
<p>
Tests that <code>window.open()</code> does not interpret the missing URL
argument as the literal string “undefined”.
</p>
<p>
Click the Test button. A new window should open. To pass the test, the address
bar of the new window should be empty. If it contains a URL (ending with “undefined”), WebKit failed the test.
</p>
<button onclick="window.open()">Test</button>
</body>