chromium/third_party/blink/web_tests/fast/events/context-menu-key-shift-f10-modifiers.html

<!DOCTYPE html>
<title>Test Context Menu Key, Shift+F10 with Modifiers</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<a href="#" id="anchor">Anchor</a>
<script>
test(function() {
    assert_not_equals(window.eventSender, undefined, 'This test requires eventSender.');

    var contextMenuFired = false;
    var anchor = document.getElementById('anchor');
    anchor.addEventListener('contextmenu', () => contextMenuFired = true);

    function testContextMenuEvent(key, modifiers, shouldFire) {
        contextMenuFired = false;
        anchor.focus();
        eventSender.keyDown(key, modifiers);
        // Esc key to hide context menu
        eventSender.keyDown("Escape");
        assert_equals(contextMenuFired, shouldFire, `${key}+${modifiers} opens Context Menu:${shouldFire}.`);
    }

    testContextMenuEvent('ContextMenu', [], true);
    testContextMenuEvent('ContextMenu', ['numLockOn'], true);
    testContextMenuEvent('ContextMenu', ['capsLockOn'], true);
    testContextMenuEvent('ContextMenu', ['altKey'], false);
    testContextMenuEvent('ContextMenu', ['ctrlKey'], false);
    testContextMenuEvent('ContextMenu', ['shiftKey'], false);

    testContextMenuEvent('F10', ['shiftKey'], true);
    testContextMenuEvent('F10', ['shiftKey', 'numLockOn'], true);
    testContextMenuEvent('F10', ['shiftKey', 'capsLockOn'], true);
    testContextMenuEvent('F10', ['shiftKey', 'altKey'], false);
    testContextMenuEvent('F10', ['shiftKey', 'ctrlKey'], false);
}, 'Context Menu keys should allow NumLock/CapsLock/etc but not other modifiers.');
</script>