chromium/third_party/blink/web_tests/fast/events/label-focus.html

<html>
    <body>
        <script>
            if (window.testRunner)
                testRunner.dumpAsText();
        </script>
        <label id="label">Label: <input type=text onfocus="document.getElementById('output').innerHTML = 'THIS TEST HAS PASSED'"></label>
        <div id="output">THIS TEST HAS FAILED</div>
        <script>
            document.getElementById('label').focus()
        </script>
    </body>
</html>