chromium/third_party/blink/web_tests/external/wpt/shadow-dom/accesskey.tentative.html

<!DOCTYPE html>
<html>
<head>
<title>Shadow DOM: accesskey</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/shadow-dom.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/accesskey.js"></script>
</head>
<body>
<div id="log"></div>
<div id="container" style="position: relative"></div>
<script>

const container = document.getElementById('container');

function testAccesskeyInShadowTree(mode) {
  promise_test(async t => {
    const host = document.createElement('div');
    container.appendChild(host);
    t.add_cleanup(() => host.remove());

    const shadowRoot = host.attachShadow({mode});
    shadowRoot.innerHTML = '<button id="button" accesskey="g">Click Me with Shift+Alt+g or on Mac with Control+Option+g</button>';

    let el = shadowRoot.getElementById("button");
    let eventWatcher = new EventWatcher(t, el, ['click']);
    let waitForClick = eventWatcher.wait_for('click');

    await pressAccessKey("g");
    await waitForClick;
  }, `button element with accesskey in the shadow tree of ${mode} mode`);
}

testAccesskeyInShadowTree("open");
testAccesskeyInShadowTree("closed");

</script>
</body>