focus-reverse-unassignable-slot.html

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Joey Arhar" href="mailto:[email protected]">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1014868">
<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>
<script src="/resources/testdriver-actions.js"></script>
<script src="resources/shadow-dom.js"></script>
<script src="resources/focus-utils.js"></script>

<div>
  <template shadowrootmode=open>
    <slot></slot>
  </template>
  <slot>
    <input id=input1>
  </slot>
  <slot>
    <input id=input2>
  </slot>
</div>

<script>
promise_test(async () => {
  input2.focus();
  assert_equals(document.activeElement, input2);

  await navigateFocusBackward();
  assert_equals(document.activeElement, input1);
}, `Verifies that focusing backwards from an input inside a slot which has no shadow root goes to the previous focusable element in light DOM.`);
</script>

chromium/third_party/blink/web_tests/external/wpt/shadow-dom/focus-navigation/focus-reverse-unassignable-slot.html