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Web Window API | DOM Window fullscreen property
  • Last Updated : 31 Jul, 2019

The Window interface has a fullscreen property which tells whether the window is displayed in fullscreen mode or not.

Syntax:

BoolVal = windowReference.fullScreen;

Return value:

    Boolean
    • True: If windows is in fullscreen mode.
    • False: If windows are not in fullscreen mode.

Example :






<!DOCTYPE html>
<html>
  
<head>
    <title>
        Window fullscreen property
    </title>
</head>
  
<body>
    <center>
        <h1 style="color:green;"
                GeeksForGeeks 
            </h1>
  
        <h2>Window fullscreen property</h2>
  
        <button onclick="GFGfun();">press</button>
        <script>
            function GFGfun() {
                alert(window.fullScreen);
            }
        </script>
    </center>
</body>
  
</html>

Output:
Window not in fullscreen:

Window in fullscreen:

Browser support:

  • Firefox 3+

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