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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-attachment-fixed-border-radius-offset.html 

<!doctype html>
<title>background-attachment: fixed with border-radius and offset</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#background-attachment">
<link rel="help" href="https://crbug.com/1439780">
<link rel="match" href="background-attachment-fixed-border-radius-offset-ref.html">
<style>
  .stripe {
    position: absolute;
    top: calc(8px - 128px);
    width: 200px;
    height: 683px;
    background-image: url("/images/grgr-256x256.png");
    background-position: 0px -200px;
    background-size: 1024px 768px;
    background-repeat: no-repeat;
    background-attachment: fixed;
    border-radius: 1px 0 0 0;
    clip-path: inset(0 0 385px 0);
  }
  body {
    overflow: hidden;
    height: 300vh;
  }
</style>
<div class="stripe"></div>