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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-position/background-position-bottom-right-repeat-round.html 

<!doctype html>
<title>background-position with 'bottom' and 'right' edge keywords with background-repeat 'round'</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#background-position">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#background-repeat">
<link rel="match" href="reference/background-position-bottom-right-repeat-round-ref.html">
<style>
  #target {
    width: 100px;
    height: 100px;
    background-image: linear-gradient(45deg, lime, green);
    background-repeat: round;
    background-size: 51px 51px;
    background-position: right 25% bottom 25%;
  }
</style>
<div id="target"></div>