File: dialog-showModal-inert-crash.html

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thunderbird 1%3A128.14.0esr-1~deb12u1
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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>