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Test Info:

<!doctype html>
<link rel="author" href="mailto:wpt@keithcirkel.co.uk" />
<!-- This test passes if it does not crash. -->
<iframe src="./resources/showmodal-frame.html"></iframe>
<script>
new Promise((resolve) => (window.loaded = resolve)).then(() => {
const iframe = document.body.querySelector("iframe");
const iframeDoc = iframe.contentDocument;
iframe.remove();
iframeDoc.querySelector("dialog").close();
iframeDoc.querySelector("dialog").setAttribute("open", "");
document.body.append(iframe);
iframeDoc.querySelector("dialog").show();
});
</script>