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<!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>
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