chromium/third_party/blink/web_tests/paint/invalidation/svg/svg-background-partial-redraw.html

<!DOCTYPE html>
<html>
<head>
  <title>SVG img and bg test</title>
  <script src="../resources/text-based-repaint.js" type="text/javascript"></script>
  <script type="text/javascript">
  function repaintTest() {
    document.getElementById('test').className = 'revealed';
  }
  </script>
  <style type="text/css" media="screen">
    div {
      -webkit-box-sizing: border-box;
    }

    #test
    {
      position: relative;
      height: 200px;
      width: 200px;
      background: url('../../../svg/as-background-image/resources/circle.svg') 0 0 no-repeat;
      border: 1px solid black;
    }

    #revealer {
      position: absolute;
      top: 100px;
      left: 0;
      height: 100px;
      width: 200px;
      background-color: red;
    }
    
    #test.revealed > #revealer {
      display: none;
    }

    #test:hover > #revealer {
      display: block;
    }
  </style>
</head>
<body onload="runRepaintAndPixelTest()">

<p>You should continue see a full blue circle when part of the element is redrawn (hover to test interactively).</p>
<div id="test">
  <div id="revealer"></div>
</div>

</body>
</html>