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

<!DOCTYPE html>
<title>CSS Masking: clip path with margin-box and border-radius when the ratio of border-radius/margin is less than 1</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking-1/#the-clip-path">
<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-margin-box">
<link rel="match" href="clip-path-marginBox-1d-ref.html">
<meta name="fuzzy" content="maxDifference=0-224; totalPixels=0-500">
<meta name="assert" content="Check that the 'clip-path' property supports margin-box with border-radius.">

<style>
  .clipped {
    width: 50px;
    height: 50px;
    background-color: green;
    clip-path: margin-box;
    border-radius: 10px;
    /* This outline draws far outside the margin box and should be partially clipped. */
    outline: 200px solid green;
    margin: 50px;
    /* Disables margin collapsing. */
    float: left;
  }
</style>
<!--
  Spec: If the ratio of border-radius/margin is less than 1, and margin is
        positive, then the margin box corner radius is
        border-radius + margin * (1 + (ratio-1)^3).

  This test has a border-radius of 10 and a margin of 50, and should use a
  margin box corner radius of: 10 + 50 * (1 + (10/50-1)^3) = 34.4
-->
<div class="clipped"></div>