open-url-undefined.html - Android社区 - https://www.androidos.net.cn/

<body>
    <p>
        Tests that <code>window.open()</code> does not interpret the missing URL
        argument as the literal string &ldquo;undefined&rdquo;.
    </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 &ldquo;undefined&rdquo;), WebKit failed the test.
    </p>
    <button onclick="window.open()">Test</button>
</body>