<html>
<head>
<script>
function test()
{
    if (window.testRunner)
        testRunner.dumpAsText();
    var ruby = document.getElementById("t");
    ruby.innerHTML = ''; // This line mustn't crash 
    document.getElementById("result").firstChild.data = 'SUCCESS!';
}
</script>
</head>
<body onload="test()">
<div id="t"><ruby>f</div>
<div id="result">FAILED!</div>
</body>
</html>