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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/overflow-clip-margin-001.html 

<!doctype html>
<meta charset="utf-8">
<title>Verifies overflow-clip-margin extends outside bounds</title>
<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#propdef-overflow-clip-margin">
<link rel="author" title="Scott Violet" href="mailto:[email protected]">
<link rel="match" href="overflow-clip-margin-001-ref.html">
<style>
  .container {
      display: flex;
  }
  .parent {
      width: 100px;
      height: 100px;
      flex: none;
      overflow: clip;
      overflow-clip-margin: 10px;
  }
  .child {
      width: 200px;
      height: 200px;
      position: relative;
      top: -50px;
      left: -50px;
      background-color: green;
  }
  .spacer {
      flex: none;
      height: 100px;
      width: 100px;
  }

</style>
<p>You should see two green squares touching each other. The one on the
  right should be slightly larger.</p>
<div class="spacer"></div>
<div class="container">
  <div class="spacer" style="width: 90px; background-color: green"></div>
  <div class="spacer" style="width: 10px"></div>
  <div class="parent">
    <div class="child"></div>
  </div>
</div>