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chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/fill-and-stroke-styles/conic-gradient.html 

<!DOCTYPE html>
<html>
<head>
  <title>Conic gradient</title>
  <link rel="match" href="conic-gradient-expected.html"/>
</head>
<body>
  <canvas id="c"></canvas>
  <script type="text/javascript">
    const canvas = document.getElementById('c');
    const ctx = canvas.getContext('2d');

    const grad = ctx.createConicGradient(0, 100, 50);

    grad.addColorStop(0, "red");
    grad.addColorStop(0.2, "red");
    grad.addColorStop(0.2, "orange");
    grad.addColorStop(0.4, "orange");
    grad.addColorStop(0.4, "yellow");
    grad.addColorStop(0.6, "yellow");
    grad.addColorStop(0.6, "green");
    grad.addColorStop(0.8, "green");
    grad.addColorStop(0.8, "blue");

    ctx.fillStyle = grad;
    ctx.fillRect(0, 0, canvas.width, canvas.height);
  </script>

</body>
</html>