Compatible with IE 7, 8

In contentEditable mode, There is a bug where it will insert the result in wrong position.
For example, suppose we are typing @ch and At.js list China for you. After you have choose that.
At.js will insert this : @chChina.

If you open the debug console(F12). You will see an warning like this:

HTML1114: Codepage unicode from (UNICODE byte order mark) overrides conflicting codepage utf-8 from (11)

Fortunately and great thanks to people who rock on stackoverflow, I found the solution:

http://stackoverflow.com/questions/15535933/ie-html1114-error-with-custom-cleditor-button?answertab=votes#tab-top

It seems to be somethings with cleditor wysiwyg.
Add meta tag to the header element of the page, and At.js will work well:

<meta http-equiv="x-ua-compatible" content="IE=Edge"/>