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HTML | DOM console.warn() Method
  • Difficulty Level : Basic
  • Last Updated : 23 Jul, 2019

The console.warn() method is used to write a warning message in the console. So open the console to display the output (warning message).

Syntax:

console.warn( message )

Parameters: This method accepts single parameter message which is mandatory. This parameter is used to hold the warning message.

Example 1:

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<!DOCTYPE html>
<html>
  
<head>
    <title>console.warn() Method</title>
    <style>
        h1 {
            color: green;
        }
          
        body {
            text-align: center;
        }
    </style>
</head>
  
<body>
    <h1>GeeksforGeeks</h1>
    <h2>HTML console.warn() Method</h2>
    <p>Press F12 to view the message</p>
    <script>
        console.warn
            ("This is a warning message for geeksforgeeks!");
    </script>
</body>
  
</html>

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Output:



Example 2:

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<!DOCTYPE html>
<html>
  
<head>
    <title>console.warn() Method</title>
    <style>
        h1 {
            color: green;
        }
          
        body {
            text-align: center;
        }
    </style>
</head>
  
<body>
    <h1>GeeksforGeeks</h1>
    <h2>HTML console.warn() Method</h2>
    <p>Press F12 to view the message</p>
    <script>
        var Arr = ["Algorithm", "GeeksforGeeks", "Geeks"];
        console.warn(Arr);
    </script>
</body>
  
</html>

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Output:

Supported Browsers: The browser supported by console.warn() method are listed below:

  • Chrome
  • Internet Explorer 8.0
  • Firefox 4.0
  • Opera
  • Safari

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