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chromium/third_party/blink/renderer/core/testing/data/rgm_float_under_inline.html 

<!DOCTYPE html>
<div id="container" style="position: absolute; top: 50px; left: 60px">
  <span id="span" style="position: relative; top: 100px; left: 200px">
    <div id="float" style="float: left">
      <div id="layer-under-float" style="position: relative"></div>
    </div>
  </span>
</div>