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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/navigating-across-documents/plugin-document.historical.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Same-origin PDFs must not create accessible Document objects</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<!-- https://github.com/whatwg/html/pull/6947 -->

<iframe src="resources/portable-document-format-sample-valid.pdf"></iframe>

<script>
setup({ explicit_done: true });

window.onload = () => {
  test(() => {
    assert_throws_dom("SecurityError", () => {
      document.querySelector("iframe").contentWindow.document;
    });
  });
  done();
};
</script>