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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-types.html 

<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" href="mailto:[email protected]">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="container">
  <div popover>Popover</div>
  <div popover=manual>Async</div>
  <div popover=manual>Async</div>
</div>
<script>
  const auto = container.querySelector('[popover=""]');
  const manual = container.querySelectorAll('[popover=manual]')[0];
  const manual2 = container.querySelectorAll('[popover=manual]')[1];
  function assert_state_1(autoOpen,manualOpen,manual2Open) {
    assert_equals(auto.matches(':popover-open'),autoOpen,'auto open state is incorrect');
    assert_equals(manual.matches(':popover-open'),manualOpen,'manual open state is incorrect');
    assert_equals(manual2.matches(':popover-open'),manual2Open,'manual2 open state is incorrect');
  }
  test(() => {
    assert_state_1(false,false,false);
    auto.showPopover();
    assert_state_1(true,false,false);
    manual.showPopover();
    assert_state_1(true,true,false);
    manual2.showPopover();
    assert_state_1(true,true,true);
    auto.hidePopover();
    assert_state_1(false,true,true);
    manual.hidePopover();
    assert_state_1(false,false,true);
    manual2.hidePopover();
    assert_state_1(false,false,false);
  }, 'manuals do not close popovers');
</script>