HTMLIFrameElement.contentWindow

The contentWindow property returns the Window object of an HTMLIFrameElement. You can use this Window object to access the iframe's document and its internal DOM. This attribute is read-only, but its properties can be manipulated like the global Window object.

Example of contentWindow

var x = document.getElementsByTagName("iframe")[0].contentWindow;
//x = window.frames[0];

x.document.getElementsByTagName("body")[0].style.backgroundColor = "blue";
// this would turn the 1st iframe in document blue.

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'HTMLIFrameElement: contentWindow' in that specification.
Living Standard

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
contentWindowChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 8Opera Full support 8Safari Full support 3WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0

Legend

Full support  
Full support