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chromium/third_party/blink/web_tests/external/wpt/css/motion/offset-path-ray-009.html 

<!DOCTYPE html>
<html>
  <head>
    <title>CSS Motion Path: ray paths</title>
    <link rel="help" href="https://drafts.fxtf.org/motion-1/#offset-path-property">
    <link rel="match" href="offset-path-ray-009-ref.html">
    <meta name="assert" content="The initial position is outside the containing block.">
    <style>
      #container {
        width: 200px;
        height: 200px;
      }
      #target {
        position: relative;
        left: 140%;
        top: 70%;
        width: 40px;
        height: 40px;
        background-color: lime;
        offset-path: ray(180deg closest-side);
        offset-distance: 100%;
        offset-position: auto;
      }
    </style>
  </head>
  <body>
    <div id="container">
      <div id="target"></div>
    </div>
  </body>
</html>