I'm afraid you may need to pay close attention to the first paragraph. The one where the guy says that it only works in Firefox. By which he means "Firefox".

Given the ambition of this hack, I'm not surprised that he's not rushing to make it work cross-browser...

Ah, point taken. I guess I was too interested in the editor itself to bother reading the whole page first.

I, too, plead guilty of not reading the text before trying the demo. I mean, if there's a demo, why bother reading?

See also "Treating user myopia" on Coding Horror. http://www.codinghorror.com/blog/archives/001306.html