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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/scrollable-overflow-float.html 

<!DOCTYPE html>
<meta name="assert" content="This ensures that floats block-end margin contributes to the scrollable overflow.">
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollable" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('#target')">
  <div id="target" style="width: 100px; height: 100px; overflow: scroll;" data-expected-scroll-height="220">
    <div style="float: left; width: 50px; height: 200px; margin: 10px; background: lime;"></div>
  </div>
  <div id=log></div>
</body>