Web/API/Window/length

Returns the number of frames (either <frame> or <iframe> elements) in the window.

Syntax

framesCount = window.length;

• framesCount is the number of frames.

Example

if (window.length) {
  // this is a document with subframes
}

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'Window.length' in that specification.	Living Standard
HTML5The definition of 'Window.length' in that specification.	Recommendation

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
length	Chrome Full support 1	Edge Full support 12	Firefox Full support 1	IE Full support 4	Opera Full support ≤12.1	Safari Full support 1	WebView Android Full support 1	Chrome Android Full support 18	Firefox Android Full support 4	Opera Android Full support ≤12.1	Safari iOS Full support 1	Samsung Internet Android Full support 1.0

Legend

Full support  

Full support

Window.length by Mozilla Contributors is licensed under CC-BY-SA 2.5.