chromium/third_party/blink/web_tests/fast/hidpi/offset-path-ray.html

<!DOCTYPE html>
<script src="resources/srcset-helper.js"></script>

<style>
  #target {
    background-color: lime;
    width: 21px;
    height: 13px;
    position: absolute;
    left: 0px;
    top: 0px;
    transform-origin: 0px 0px;
    offset-path: ray(90deg closest-side);
    offset-distance: 30px;
    offset-position: auto;
  }
</style>

<body>
  <!-- This test passes if the target moves 30px across -->
  <div id="target"></div>
</body>