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HTML | Window alert( ) Method

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  • Last Updated : 05 Aug, 2022

 The Window alert() method is used to display an alert box. It displays a specified message along with an OK button and is generally used to make sure that the information comes through the user. It returns a string which represents the text to display in the alert box. 

Syntax:

alert(message)

Below program illustrates the Window alert() Method : 

Displaying an alert box. 

html




<!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.\n " +
                "It is the best portal for computer" +
                         "science enthusiasts!");
        }
    </script>
 
</body>
 
</html>

Output: 

After clicking the button:

Supported Browsers: The browser supported by Window alert( ) Method are listed below:

  • Google Chrome 1
  • Edge 12
  • Internet Explorer 4
  • Firefox 1
  • Opera 3
  • Safari 1

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