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chromium/third_party/blink/web_tests/external/wpt/css/css-images/conic-gradient-angle-negative.html 

<!doctype html>
<meta charset="utf-8">
<title>Conic gradient with negative angle parameter</title>
<link rel="help" href="https://drafts.csswg.org/css-images-4/#conic-gradients">
<meta name="assert" content="Rendering of conic-gradient with negative center parameter">
<meta name="fuzzy" content="maxDifference=1;totalPixels=40000">
<link rel="match" href="reference/200x200-blue-black-green-red.html">
<style>
  #gradient {
    width: 200px;
    height: 200px;
    background-image: conic-gradient(from -90deg, blue 0 25%, black 25% 50%, red 50% 75%, green 75% 100%);
  }
</style>
<div id="gradient"></div>