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chromium/third_party/blink/web_tests/svg/text/textpath-reference-path-on-out-of-use-element-expected.html 

<!DOCTYPE HTML>
<svg>
  <path id="svgpath" d="M100 100 350 100"/>
  <text id="svgtext">
    <textPath xlink:href="#svgpath">Hello, SVG</textPath>
  </text>
</svg>