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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://chromium-review.googlesource.com/c/chromium/src/+/4094463/8/third_party/blink/renderer/core/html/html_element.cc#1404">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=popover1 popover=auto>popover1</div>
<div id=popover2 popover=auto>popover2</div>
<script>
test(() => {
const popover2 = document.getElementById('popover2');
popover1.showPopover();
popover1.addEventListener('beforetoggle', () => {
popover2.remove();
});
assert_throws_dom('InvalidStateError', () => popover2.showPopover(),
"popover1's beforetoggle event handler removes popover2 so showPopover should throw.");
assert_false(popover2.matches(':popover-open'), 'popover2 should not match :popover-open once it is closed.');
}, 'Removing a popover while it is opening and force closing another popover should throw an exception.');
</script>
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