<svg xmlns="http://www.w3.org/2000/svg" height="200" width="400" onload="test()">
<script type="text/javascript">
function test() {
document.getElementsByTagNameNS('http://www.w3.org/2000/svg', 'text')[0].firstChild.data = 'PASS';
}
</script>
<text x="20" y="20" font-size="20">FAIL: This text should change.</text>
</svg>