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chromium/third_party/blink/web_tests/external/wpt/svg/styling/use-element-transitions-ref.html 

<!DOCTYPE html>
<title>Test Reference</title>
<style>
  use { font-size: 60px; }
  g { font-size: 100px; }
</style>
<svg>
  <use id="use_elm" xlink:href="#tmpl" />
  <g id="g_elm">
    <text id="tmpl" x="10" y="100">Hello!</text>
  </g>
</svg>