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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/clip-path-reference-box-002.html 

<!DOCTYPE html>
<title>CSS Masking: clip path with floated element</title>
<link rel="author" title="Fredrik Söderquist" href="mailto:[email protected]">
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=418484">
<link rel="match" href="reference/clip-path-reference-box-002-ref.html">
<meta name="assert" content="Check that the 'clip-path' property uses the border box as the reference box.">

<style>
.clipped {
  width: 100px;
  height: 200px;
  background-color: green;
  clip-path: polygon(0% 0%,100% 0%,100% 50%,0% 50%);
}
</style>
<div class="clipped">
  <div style="float:left; margin-left:-100px; margin-top:-100px;">&nbsp;</div>
</div>