chromium/third_party/blink/web_tests/fast/overflow/auto-with-block-overflow-expected.html

<!DOCTYPE html>
<style>
  /* Prevent auto viewport overflow, because that would trigger another
     layout pass, hiding the bug. */
  body { overflow:hidden; }
</style>
<p>There should be a green square below. No red, orange or yellow.</p>
<div style="width:50px; height:50px; background:green;"></div>