<!DOCTYPE html>
<html>
<head>
    <style>
        .clipper {
            position: absolute;
            top: 100px;
            left: 100px;
            width: 200px;
            height: 200px;
            clip-path: url(#clipper);
            background: lime;
        }
        
        .clipper > div {
            position: absolute;
            width: 200px;
            height: 200px;
            background-color: blue;
        }
        
        .above {
            top: -100px;
            left: -100px;
        }

        .below {
            top: 100px;
            left: 100px;
        }
    </style>
</head>
<body>
  <div class="clipper">
    <div class="below"></div>
    <div class="above"></div>
  </div>
    <svg height="0" width="0">
    <clipPath id="clipper" clipPathUnits="objectBoundingBox">
        <!--Two rects triggers the buffer-based clipping in RenderSVGResourceClipper::applyClippingToContext() -->
      <rect x="0.25" y="-0.25" width="0.25" height="1"/>
      <rect x="0.25" y="0.25" width="0.5" height="1.5"/>
    </clipPath>
  </svg>
</body>
</html>