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HTML | Window alert( ) Method

  • Last Updated : 26 Jul, 2019

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.


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Below program illustrates the Window alert() Method :

Displaying an alert box.

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


After clicking the button

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

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

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