chromium/third_party/blink/web_tests/svg/custom/textPath-change-reference.svg

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="runTest()">
  <path id="thePath" d="M150 50 L 450 50" />
  <text>
    <textPath id="theTP" xlink:href="#wrongPath">PASS</textPath>
  </text>
  <script><![CDATA[
    function runTest() {
      var tp = document.getElementById("theTP");
      tp.setAttributeNS("http://www.w3.org/1999/xlink","href","#thePath");
    }
  ]]></script>
</svg>