<!DOCTYPE html>
<svg>
  <defs>
    <rect id="r" x="100" y="50" width="100" height="100"/>
    <clipPath id="c">
      <use xlink:href="#r" style="x: -100px; y: -50px"/>
    </clipPath>
  </defs>
  <rect width="200" height="200" fill="red" clip-path="url(#c)"/>
  <rect width="100" height="100" fill="green"/>
</svg>