Content on any element

I just created a test for whether a browser can overwrite the content of an element: http://www.geocities.com/seanmhall2003/css3/content.html 
Only Opera can, unless Safari 1.2 does (I won't have access to Safari 1.2 until a week from today). So either Mozilla just hasn't implemented this yet or it doesn't want to. Mozilla shouldn't support this. I doubt Opera will remove support for this (it even works on divs with no content in the HTML source). So really a lot of CSS designs won't use this yet. I still say it's evil. 

Dante