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HTMLIFrameElement: contentDocument property

Baseline

Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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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

const iframeDocument = document.querySelector("iframe").contentDocument;

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

Specifications

Specification
HTML # dom-iframe-contentdocument

Browser compatibility

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This page was last modified on Nov 30, 2025 by MDN contributors.

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