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<html>
<body>

<p id="p1">Hello World!</p>

<script>
document.getElementById("p1").innerHTML="New text!";
</script>

</body>
</html>

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<html>

<body>
<p id="p2">Hello world!</p>

<script>
document.getElementById("p2").style.color="blue";
</script>

</body>
</html>

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<div id="d1">
<p id="p1">This is a paragraph.</p>
<p id="p2">This is another paragraph.</p>
</div>

<script>
var para=document.createElement("p");
var node=document.createTextNode("This is new.");
para.appendChild(node);

var element=document.getElementById("d1");
element.appendChild(para);
</script>

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