HTML | Window alert( ) Method

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.

<!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
Internet Explorer
Firefox
Opera
Safari

My Personal Notes

Recommended Posts:

Shubrodeep Banerjee

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.