<!DOCTYPE html>
<html>
  <body>
    <svg width="300" height="300" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1">
      <defs>
        <clipPath id="clip1">
          <rect x="200" y="200" width="100" height="100"/>
        </clipPath>
      </defs>

      <rect width="100" height="100" fill="red"/>

      <!-- Doesn't draw anything, but should not taint the clip stack -->
      <image x="200" y="200" width="100" height="100" clip-path="url(#clip1)"
        xlink:href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'></svg>"/>

      <rect width="100" height="100" fill="green"/>
    </svg>
  </body>
</html>