chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/clip-path-contentBox-1e.html

<!DOCTYPE html>
<title>CSS Masking: clip path with content-box and border-radius</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-content-box">
<link rel="match" href="reference/green-circle-100x100.html">
<meta name="fuzzy" content="maxDifference=0-65; totalPixels=0-400">
<meta name="assert" content="Check that the 'clip-path' property supports content-box with border-radius.">

<style>
  body { margin: 0; }
  .clipped {
    display: inline-block;
    clip-path: content-box;
    /* This background draws in the padding and should be clipped. */
    background-color: red;
    padding: 4px;
    border-radius: 58px;
    /* This border draws outside the content box and should be clipped. */
    border: 4px solid darkred;
    /* This outline draws outside the content box and should be clipped. */
    outline: 100px solid maroon;
  }
  .content {
    width: 100px;
    height: 100px;
    background: green;
  }
</style>
<div class="clipped">
  <div class="content"></div>
</div>