HTML DOM Window innerWidth Property

The Window innerWidth property is used for returning the width of a window’s content area. It is a read-only property and returns a number which represents the width of the browser window’s content area in pixels.

Syntax:

window.innerWidth

Return Value: It returns a number that represents the browser window’s content area width in pixels.

Below program illustrates the Window innerWidth Property :
Returning the current frame’s width.

html

<!DOCTYPE html>
<html>
<head>
    <title>
      Window innerWidth Property in HTML
    </title>
    <style>
        h1 {
            color: green;
        }
          
        h2 {
            font-family: Impact;
        }
          
        body {
            text-align: center;
        }
    </style>
</head>
<body>
  
    <h1>GeeksforGeeks</h1>
    <h2>Window innerWidth Property</h2>
      
<p>
      For returning the current frame's width, 
      double click the "Check Width" button: 
    </p>
  
    <button ondblclick="width()">Check Width</button>
    <p id="measure"></p>
  
    <script>
        function width() {
            var w = window.innerWidth;
            document.getElementById("measure").innerHTML =
                                     "Frame's Width: " + w;
        }
    </script>
</body>
</html>