HTMLIFrameElement.contentDocument

If the iframe and the iframe's parent document are Same Origin, returns a Document (that is, the active document in the inline frame's nested browsing context), else returns null.

Example of contentDocument

var iframeDocument = document.getElementsByTagName("iframe")[0].contentDocument;

iframeDocument.body.style.backgroundColor = "blue";
// This would turn the iframe blue.

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
contentDocument
1
12
1
8
≤12.1
3
1
18
4
≤12.1
1
1.0

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https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/contentDocument