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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/the-dialog-element/modal-dialog-in-object.html 

<!DOCTYPE html>
<title>Modal dialog inside object should not generate box</title>
<link rel=match href="modal-dialog-in-object-ref.html">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/6939">
<link rel=help href="https://fullscreen.spec.whatwg.org/#new-stacking-layer">
<style>
dialog {
  background: green;
  border-color: green;
}
</style>
<object width="200" type="image/svg+xml" data="../../../../images/100px-green-rect.svg">
  <dialog id="dialog"></dialog>
</object>
<script>
document.getElementById('dialog').showModal();
</script>