blur-on-shadow-host-delegatesFocus.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: Blur on shadow host</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

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

<script>
const host = document.getElementById("host");

const shadowRoot = host.attachShadow({ mode: "open", delegatesFocus: true });

shadowRoot.innerHTML = "<input><slot>"

test(function() {
  host.focus();
  assert_equals(document.activeElement, host);
  assert_equals(shadowRoot.activeElement, shadowRoot.querySelector("input"));
  host.blur();
  assert_equals(document.activeElement, document.body);
  assert_equals(shadowRoot.activeElement, null);
}, "Calling blur() on shadow host with delegatesFocus should remove the focus.");

test(function() {
  const slotted = document.getElementById("slotted");
  slotted.focus();
  assert_equals(document.activeElement, slotted);
  assert_equals(shadowRoot.activeElement, null)
  host.blur();
  assert_equals(document.activeElement, slotted);
  assert_equals(shadowRoot.activeElement, null)
}, "Calling blur() on shadow host with delegatesFocus when the focus is on a slotted element should not remove the focus.");
</script>
chromium/third_party/blink/web_tests/external/wpt/shadow-dom/focus/blur-on-shadow-host-delegatesFocus.html
