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<html>
<head>
<title>alert onclick example</title>
<script type="text/javascript">
function causealert()
{
var txt = document.getElementById("p1").textContent;
alert(txt);
}
</script>
</head>
<body>
<div style="border: 1px solid red">
<p id="p1">First line of paragraph.<br /></p>
</div><br />
<button id="button1" >add another textNode.</button>
<script>
var button = document.getElementById("button1");
button.onclick = causealert;
</script>
</body>
</html>
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