Why is it impossible to change content in css?

Question

CSS2.1 pseudo-selectors such as ::after and ::before allows to add text content to the page. For example :

CSS

Answer 1

Actually it is possible to use content property directly on elements, and not on pseudo-elements only. Try

   p { content:'My hero is' }

in Opera and you'll see the result you wanted. The thing is other browsers don't support it yet.

A lot of other interesting things concerning generated content cat be found in CSS3 Generated and Replaced Content Module, but we'll have to wait a bit until browser venrors implement it.