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HTML | Window length Property
  • Last Updated : 26 Jul, 2019

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

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