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chromium
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chromium/content/test/data/accessibility/html/iframe-create.html 

<!--
@WIN-ALLOW:ia2_hypertext=*
@WAIT-FOR:done
-->
<body>
</body>
<script>
  const iframe = document.createElement('iframe');
  iframe.srcdoc = '<a href="/">done</a>';
  document.body.appendChild(iframe);
</script>