<html>
<head>
<title>My title</title>
</head>
<body>
<p>Click the button to change the title of the document.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
document.title = "Some new title text";
document.getElementById("demo").innerHTML = "The title of the document was changed from 'My title' to 'some new title text'. View Source to see the effect.";
}
</script>
</body>
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</html>