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chromium/third_party/blink/web_tests/external/wpt/css/css-overflow/overflow-clip-margin-010-ref.html 

<!doctype html>
<html class="reftest">
<meta charset="utf-8">
<title>Overflow-clip-margin corner shape (ref)</title>
<link rel="help" href="https://www.w3.org/TR/css-overflow-3/#propdef-overflow-clip-margin">
<link rel="author" title="Vladimir Levin" href="mailto:[email protected]">
<style>
.container {
  width: 100px;
  height: 100px;

  position: relative;
  top: 30px;
  left: 30px;

  border: 5px solid green;

  border-radius: 0px 15px 25px 35px;
}
.clipper {
  width: 140px;
  height: 140px;

  margin: -20px;
  border-radius:0px 27.5px 40px 50px;
  overflow: clip;
}
.child {
  width: 400px;
  height: 400px;
  background: lightblue;
  opacity: 0.8;
}
</style>

<div class=container>
  <div class=clipper>
    <div class=child></div>
  </div>
</div>