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Test Info:

<head>
<style id="style">
.penguin { overflow: hidden; }
.penguin:first-line { }
</style>
<script>
function boom()
{
document.getElementById("style").textContent += "";
document.getElementById("td").className = "penguin";
}
</script>
</head>
<body onload="boom();"><td id="td">Text</td></body>
</html>