<!DOCTYPE html>
<svg>
<rect width="100" height="100" fill="red"/>
<use href="#foo"/>
<defs>
<g id="foo">
<rect width="50" height="100" fill="green"/>
<script>
// Force a layout so that the shadow tree is instantiated.
document.documentElement.offsetTop;
</script>
<rect x="50" width="50" height="100" fill="green"/>
</g>
</defs>
</svg>