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<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/whatwg/html/pull/9142">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<dialog>hello</dialog>
<script>
test(() => {
const dialog = document.querySelector('dialog');
// calling close() on a dialog that is already closed should not throw.
dialog.close();
dialog.show();
// calling show() on a dialog that is already showing non-modal should not throw.
dialog.show();
assert_throws_dom('InvalidStateError', () => dialog.showModal(),
'Calling showModal() on a dialog that is already showing non-modal should throw.');
dialog.close();
dialog.showModal();
assert_throws_dom('InvalidStateError', () => dialog.show(),
'Calling show() on a dialog that is already showing modal should throw.');
// calling showModal() on a dialog that is already showing modal should not throw.
dialog.showModal();
});
</script>
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