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<!DOCTYPE html>
<html>
<body>

<p>Click the button to wait 3 seconds, then alert "Hello".</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
setTimeout(function(){ alert("Hello"); }, 3000);
}
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<p>Click the button to wait 3 seconds, then alert "Hello".</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    setTimeout(function(){ alert("Hello"); }, 3000);
}
</script>

</body>
</html>