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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/clip-path-marginBox-1d-ref.html 

<!DOCTYPE html>
<style>
  div {
    width: 100px;
    height: 100px;
    background-color: green;
    border-radius: 34.4px;
    border: 25px solid green;
  }
</style>
<div></div>