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chromium/third_party/blink/web_tests/external/wpt/accessibility/crashtests/aria-modal-aria-hidden.html 

<!-- Test that aria-modal, aria-owns, aria-hidden, and aria-labelledby can work together without crashing.
     This test case is a minimized version of a crash that occurred from a chat app. -->
<!DOCTYPE html>
<html class="test-wait">
<div role="main" aria-owns="owned"></div>
<div id="owned">
  <span aria-hidden="true" id="hidden-label"></span>
</div>
<div role="dialog" aria-modal="true">
  <a aria-labelledby="hidden-label"></a>
</div>
<script>
let dialogNode = null;

document.addEventListener('DOMContentLoaded', () => {
  dialogNode = document.querySelector("[role=dialog]")
  dialogNode.remove();
  requestAnimationFrame(() => {
    requestAnimationFrame(() => {
      document.querySelector("[role=main]").setAttribute("aria-hidden", true);
      document.querySelector("body").appendChild(dialogNode);
      document.documentElement.className = '';
    });
  });
});

</script>
</html>