<!DOCTYPE HTML>
<html>
<head>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.addUserStyleSheet("div { width:0; }", true);
}
</script>
</head>
<body>
<div id="target">FAIL</div>
<script>
if (document.getElementById('target').offsetWidth == 0)
    document.getElementById('target').innerHTML = 'PASS';
</script>
</body>
</html>