<!DOCTYPE html>
<html>
<head>
<title>
Window alert() Method in HTML
</title>
<style>
h1 {
color: green;
}
h2 {
font-family: Impact;
}
body {
text-align: center;
}
</style>
</head>
<body>
<h1>GeeksforGeeks</h1>
<h2>Window alert() Method</h2>
<p>
For displaying the alert message, double
click the "Show Alert Message" button:
</p>
<button ondblclick="myalert()">
Show Alert Message
</button>
<script>
function myalert() {
alert("Welcome to GeeksforGeeks.
" +
"It is the best portal for computer" +
"science enthusiasts!");
}
</script>
</body>
</html>