chromium/third_party/blink/web_tests/svg/custom/textPath-change-reference2.svg

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <path id="visiblePath" d="M150 50 L 450 50" />
  <text x="50" y="50">PASS</text>
  <text>
    <textPath id="failText" xlink:href="#visiblePath">FAIL</textPath>
  </text>
  <script><![CDATA[
    var failText = document.getElementById("failText");
    failText.setAttributeNS("http://www.w3.org/1999/xlink", "href", "#notVisiblePath");
  ]]></script>
</svg>