File: dialog-showModal-inert-crash.html

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firefox-esr 140.4.0esr-1
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<!DOCTYPE html>

<!-- This test passes if it does not crash. -->

<iframe id="frame"></iframe>
<script>
  window.onload = () => {
    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();
  };
</script>