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chromium/third_party/blink/web_tests/http/tests/svg/local-url-with-valid-base-and-resource.html 

<!DOCTYPE html>
<base href="http://127.0.0.1:8000/svg/resources/red100x100.svg">
<svg>
  <rect id="rect" width="100" height="100" fill="green"/>
  <use xlink:href="#rect" x="100"/>
</svg>