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chromium/third_party/blink/web_tests/external/wpt/css/css-images/tiled-conic-gradients.html 

<!doctype html>
<meta charset="utf-8">
<title>Checkerboard using conic gradients</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-size">
<meta name="assert" content="Gradients are correctly repeated.">
<meta name="fuzzy" content="maxDifference=1;totalPixels=40000">
<link rel="match" href="tiled-conic-gradients-ref.html">
<style>
  #gradient {
    width: 200px;
    height: 200px;
    background-color: red;
    background-size: 20% 20%;
    background-image: conic-gradient(black 0 25%, white 0 50%, black 0 75%, white 0);
  }
</style>
<div id="gradient"></div>