chromium/third_party/blink/web_tests/fast/events/menu-key-context-menu-reveal-focus.html

<!DOCTYPE html>
<title>ContextMenu Key: Reveal Focused Element</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<style>
body {
    height: 3000px;
}
</style>
<input type="text" id="txt">
<a href="#" id="anchor">Anchor</a>
<script>
test(function() {
    if (!window.eventSender) {
        document.write('This test requires eventSender');
        return;
    }
    document.getElementById('txt').focus();
    document.scrollingElement.scrollTop = 3000;
    assert_not_equals(document.scrollingElement.scrollTop, 0);
    eventSender.keyDown("ContextMenu");
    assert_equals(document.scrollingElement.scrollTop, 0);
}, 'Testing ContextMenu key should reveal focused input.');

test(function() {
    if (!window.eventSender) {
        document.write('This test requires eventSender');
        return;
    }
    document.getElementById('anchor').focus();
    document.scrollingElement.scrollTop = 3000;
    assert_not_equals(document.scrollingElement.scrollTop, 0);
    eventSender.keyDown("ContextMenu");
    assert_equals(document.scrollingElement.scrollTop, 0);
}, 'Testing ContextMenu key should reveal focused anchor.');
</script>