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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/box-shadow-border-radius-001.html 

<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Backgrounds Test: 'border-radius: 50%' with a box-shadow that has a tall and wide spread</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
  <link rel="help" href="https://www.w3.org/TR/css-text-decor-3/#text-shadow-property">
  <link rel="match" href="reference/box-shadow-border-radius-001-ref.html">
  <link rel="mismatch" href="reference/box-shadow-border-radius-001-notref.html">

  <meta content="" name="flags">

  <!--

  [css-backgrounds] The shape of box-shadow should be a circle for a box with border-radius:50% and big spread
  https://github.com/w3c/csswg-drafts/issues/7103

  https://lists.w3.org/Archives/Public/www-archive/2022Sep/att-0012/shadow-radius.html

  -->

  <meta name="fuzzy" content="maxDifference=0-56;totalPixels=0-1192">

  <style>
  div
    {
      background-color: black;
      border-radius: 50%;
      box-shadow: black 0 0 0 149px;
      height: 2px;
      margin: 157px 149px 0px;
      width: 2px;
    }

  /*

      149px
    +
        2px
    +
      149px
    ========
      300px

  */
  </style>

  <div></div>