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HTML DOM Window alert() Method

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The HTML 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 that represents the text to display in the alert box. 



Below example illustrates the Window alert() Method:

Example: In this example, we will display an alert box by double-clicking a button. 


<h1 style="color: green;">
    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!");



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

We have a Cheat Sheet on Javascript where we covered all the important topics of Javascript to check those please go through Javascript Cheat Sheet-A Basic guide to JavaScript.

Last Updated : 15 Jun, 2023
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