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chromium/third_party/blink/web_tests/external/wpt/css/css-break/box-shadow-005-ref.html 

<!DOCTYPE html>
<style>
  #mc > div {
    position: absolute;
    inset-block-start:-10px;
    inline-size: 50px;
    border: 10px solid;
  }
</style>
<p>Box shadows should be painted around all of the three fragments.</p>
<div id="mc" style="position:relative; margin:50px; inline-size:400px; block-size:100px; background:yellow;">
  <div style="inset-inline-start:-10px; block-size:100px;"></div>
  <div style="inset-inline-start: 140px; block-size:100px;"></div>
  <div style="inset-inline-start: 290px; block-size:50px;"></div>
</div>