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chromium/third_party/blink/web_tests/external/wpt/shadow-dom/focus-navigation/focus-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=1209217">
<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>

<slot>
  <input id=input1>
</slot>
<slot>
  <input id=input2>
</slot>

<script>
promise_test(async () => {
  input1.focus();
  assert_equals(document.activeElement, input1);

  await navigateFocusForward();
  assert_equals(document.activeElement, input2);
}, `Verifies that focusing forwards from an input inside a slot which has no shadow root goes to the next focusable element in light DOM.`);
</script>