shadow-relatedTarget.html

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This WPT test may be referenced by the following Test IDs:
- /dom/events/shadow-relatedTarget.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<!--

  This test is adopted from Olli Pettay's test case at

  http://mozilla.pettay.fi/shadow_focus.html

-->

<div id="host"></div>

<input id="lightInput">

<script>

const root = host.attachShadow({ mode: "closed" });

root.innerHTML = "<input id='shadowInput'>";

async_test((test) => {

  root.getElementById("shadowInput").focus();

  window.addEventListener("focus", test.step_func_done((e) => {

    assert_equals(e.relatedTarget, host);

  }, "relatedTarget should be pointing to shadow host."), true);

  lightInput.focus();

}, "relatedTarget should not leak at capturing phase, at window object.");

async_test((test) => {

  root.getElementById("shadowInput").focus();

  lightInput.addEventListener("focus", test.step_func_done((e) => {

    assert_equals(e.relatedTarget, host);

  }, "relatedTarget should be pointing to shadow host."), true);

  lightInput.focus();

}, "relatedTarget should not leak at target.");

</script>