<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="runTest()">
<path id="foo" d="M150 50 L 450 50" />
<text x="50" y="50">PASS</text>
<pattern id="pat" patternUnits="userSpaceOnUse" x="0" y="0" width="400" height="400">
<text>
<textPath id="theTP" xlink:href="#foo">FAIL</textPath>
</text>
</pattern>
<rect width="400" height="400" fill="url(#pat)" stroke="black" stroke-width="1"/>
<script><![CDATA[
function runTest() {
var path = document.getElementById("foo");
path.setAttribute("id", "bar");
}
]]></script>
</svg>