<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" href="mailto:masonf@chromium.org">
<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>

<div popover id=popover1>Popover</div>

<script>
  window.onload = () => {
    test((t) => {
      const popover1 = document.querySelector('#popover1');
      popover1.showPopover();
      assert_true(popover1.matches(':popover-open'));
      assert_true(!document.querySelector('#popover2'));
      document.open();
      document.write('<!DOCTYPE html><div popover id=popover2>Popover</div>');
      document.close();
      assert_true(!document.querySelector('#popover1'),'popover1 should be removed from the document');
      assert_true(!!document.querySelector('#popover2'),'popover2 should be in the document');
      assert_false(popover1.matches(':popover-open'),'popover1 should have been hidden when it was removed from the document');
      assert_false(popover1.matches(':popover-open'),'popover2 shouldn\'t be showing yet');
      popover2.showPopover();
      assert_true(popover2.matches(':popover-open'),'popover2 should be able to be shown');
      popover2.hidePopover();
    },'document.open should not break popovers');
  };
</script>
