LayoutTests/svg/clip-path/clip-path-dom-id.svg

<svg xmlns="http://www.w3.org/2000/svg">
<clipPath id="oldclip" clipPathUnits="userSpaceOnUse">
  <rect width="200" height="200"/>
</clipPath>
<g clip-path="url(#newclip)">
  <rect width="400" height="400" fill="red"/>
  <rect width="200" height="200" fill="green"/>
</g>
<script>
document.getElementsByTagName("clipPath")[0].setAttribute("id", "newclip");
</script>
</svg>