alert box: To display some message in the dialog box.
Example for alert box
<html>
<head>
<script>
a = 10;
alert('Value of a is ' + a);
</script>
</head>
<body>
</body>
</html>
Example for alert box
<html>
<head>
<script>
a = 10;
alert('Value of a is ' + a);
</script>
</head>
<body>
</body>
</html>
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