Fullscreen API using JavaScript

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The window supports the full-screen interface by using web API. We can activate or deactivate the full-screen mode of the screen. The fullscreen API provides methods to present a specific element in a full-screen mode.

Approach:

The onclick event will trigger the activate() method which will be for activating the full screen.
The same will be applied for exiting from the full screen.

<button onclick="activate(document.documentElement);">
      Go To Full Screen
</button>
<button onclick="deactivate();">
      Leave Full Screen
</button>

Example: The following code uses the requestFullscreen() method. The same is done for exiting full screen by using exitFullscreen() method.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta http-equiv="X-UA-Compatible" content="IE=edge" /> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0" /> 
</head> 
  
<body> 
    <h1 style="color: green">GeeksForGeeks</h1> 
  
    <h2>Window fullscreen property</h2> 
  
    <button onclick="activate(document.documentElement);"> 
        Go To Full Screen 
    </button> 
  
    <button onclick="deactivate();">Leave FullScreen</button> 
  
    <script> 
  
        // Function for full screen activation 
        function activate(ele) { 
            if (ele.requestFullscreen) { 
                ele.requestFullscreen(); 
            } 
        } 
  
        // Function for full screen activation 
        function deactivate() { 
            if (document.exitFullscreen) { 
                document.exitFullscreen(); 
            } 
        } 
    </script> 
</body> 
  
</html> 