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<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Timing</h2>
<p>Click "Try it". Wait 3 seconds, and the page will alert "Hello".</p>
<button onclick="setTimeout(myFunction, 3000);">Try it</button>
<script>
function myFunction() {
  alert('Hello');
}
</script>
</body>
</html>