> For the complete documentation index, see [llms.txt](https://jen-hsuan-hsieh.gitbook.io/javascript-node-js/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jen-hsuan-hsieh.gitbook.io/javascript-node-js/chapter1/11bi-ji/19iframe/192iframe-contentwindow-property.md).
# 1.9.2.IFrame contentWindow property
## 1.Introduction
* contentWindow可以回傳由IFrame產生的window object
* 藉由window object, 可以取得document object以及其任何一個element
## 2.Usage
* Example from [w3schools.com](https://www.w3schools.com/jsref/prop_frame_contentwindow.asp)
```
Click the button to change the background color of the document contained in the iframe.