chromium/third_party/blink/web_tests/fast/forms/submit/submit-focus-by-mouse.html

<!DOCTYPE html>
<body>
<script>
pixelTestingOnly = true;
</script>
<script src="../../../resources/js-test.js"></script>
<script src="../resources/common.js"></script>

<input type="submit">
<div id="console"></div>

<script>
eventSender.mouseMoveTo(800, 600);
description('Clicking on a form control should focus on it.');
var target = document.querySelector('input');
target.addEventListener('focus', function() {
    testPassed('Focus event was dispatched.');
}, false);
clickElement(target);
</script>
</body>