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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-not-keyboard-focusable.html 

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Popover keyboard focus behaviors</title>
<link rel="author" href="mailto:[email protected]">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<button id=firstfocus tabindex="0">Button 1</button>
<div popover>
  <p>This is a popover without a focusable element</p>
</div>
<button id=secondfocus tabindex="0">Button 2</button>

<script>
promise_test(async () => {
  const b1 = document.getElementById('firstfocus');
  const b2 = document.getElementById('secondfocus');
  const popover = document.querySelector('[popover]');
  b1.focus();
  assert_equals(document.activeElement,b1);
  popover.showPopover();
  assert_true(popover.matches(':popover-open'));
  assert_equals(document.activeElement,b1);
  // Tab once
  await new test_driver.send_keys(document.body,'\uE004'); // Tab
  assert_equals(document.activeElement, b2, 'Keyboard focus should skip the open popover');
  assert_true(popover.matches(':popover-open'),'changing focus should not close the popover');
  popover.hidePopover();

  // Add a focusable button to the popover and make sure we can focus that
  const button = document.createElement('button');
  button.setAttribute("tabindex", "0");
  popover.appendChild(button);
  b1.focus();
  popover.showPopover();
  assert_equals(document.activeElement,b1);
  // Tab once
  await new test_driver.send_keys(document.body,'\uE004'); // Tab
  assert_equals(document.activeElement, button, 'Keyboard focus should go to the contained button');
  assert_true(popover.matches(':popover-open'),'changing focus to the popover should leave it showing');
  popover.hidePopover();
  assert_false(popover.matches(':popover-open'));
}, "Popover should not be keyboard focusable");
</script>