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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 Standard
The definition of 'Window.length' in that specification.
Living Standard  
HTML5
The definition of 'Window.length' in that specification.
Recommendation  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
lengthChrome Full support YesEdge Full support 12Firefox Full support YesIE ? Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

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