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chromium/third_party/blink/web_tests/external/wpt/css/css-sizing/auto-scrollbar-inside-stf-abspos-ref.html 

<!DOCTYPE html>
<style>
  body { overflow:hidden; }
</style>
<p>The word PASS should be visible below.</p>
<div style="position:absolute; height:5em; overflow-y:scroll;">
  <div style="height:15em;">PASS</div>
</div>