HTML | Window length Property

The Window length property is used for returning the number of <iframe> elements in the current window. It is a read-only property and it returns a number which represents the number of frames in the current window.



Below program illustrates the Window length Property :

Returning the number of <iframe> elements in the current window.





<!DOCTYPE html>
      Window length Property in HTML
        h1 {
            color: green;
        h2 {
            font-family: Impact;
        body {
            text-align: center;
    <h2>Window length Property</h2>
    <iframe src=
    <iframe src=
      For returning the number of iframe elements
      in the current window, double click the 
      "Check Frames" button: 
    <button ondblclick="frame()">
      Check Frames
    <p id="count"></p>
        function frame() {
            var c = window.length;
            document.getElementById("count").innerHTML = c;



After clicking the button

Supported Browsers: The browser supported by Window length Property are listed below:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

My Personal Notes arrow_drop_up

I am a technology enthusiast who has a keen interest in programming I am pursuing Engineering in Computer Science from GEU, Dehradun I like to unwind by watching movies and English sitcomsI have a keen interest in music

If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at to report any issue with the above content.