testing/web-platform/tests/accessibility/crashtests/move-owned-inside-another-owned.html


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<script>
window.onload = function() {
  // Reparent z1 under z2.
  const z2 = document.getElementById('z2');
  z2.appendChild(document.querySelector('#z1'));
}
</script>
<div aria-owns="z1 z2">
  <progress>
    <div id="z1"></div>
    <div id="z2"></div>
  </progress>
</div>