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<!DOCTYPE html>
<iframe id="frame"></iframe>
<script>
async_test(function(t) {
onload = t.step_func(() => {
const host = document.createElement("div");
frame.appendChild(host);
frame.contentDocument.body.innerHTML = "<dialog></dialog>";
document.body.offsetTop;
const root = host.attachShadow({mode: 'open'});
root.innerHTML = "<content>";
const dialog = frame.contentDocument.querySelector("dialog");
dialog.showModal();
t.done();
});
}, "Dialog.showModal() called when we have a dirty shadow distribution should not crash.");
</script>
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