<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink">
  <defs>
    <polygon id="p" points="0.25,0 0.75,0 0.75,1 0.25,1"/>
    <clipPath id="cp" clipPathUnits="objectBoundingBox">
      <use xlink:href="#p"/>
    </clipPath>
    <mask id="m" maskContentUnits="objectBoundingBox">
      <rect x="0" y="0.25" width="1" height="0.5" fill="white"/>
    </mask>
  </defs>
  <rect width="100%" height="100%" fill="lime"/>
  <rect x="101" y="101" width="198" height="198" fill="red"/>
  <rect width="400" height="400" fill="lime" mask="url(#m)" clip-path="url(#cp)"
        x="-400" y="-400" transform="translate(400,400)"/>
</svg>