chromium/third_party/blink/web_tests/svg/custom/stroke-fallback-invalid-uri.html

<!DOCTYPE html>
<svg stroke="red" stroke-width="50">
  <rect x="25" y="25" width="50" height="50" fill="none" stroke="green"/>
  <rect x="25" y="25" width="50" height="50" fill="none" stroke="url(#nonexisting)"/>
</svg>