Before the re-work of SitePoint, there used to be separate markup tags for different languages (e.g. HTML, CSS, PHP, etc)
The idea was that each tag was intelligent enough to shade the language in such a way that it was highly readable.
Now those are gone, and it is a real pain for both posters and readers!!!
(I found out by experimenting that if you use [php] or [html] they still work, but why not bring back all of the tags and make sure there are corresponding buttons in the toolbar above?!)
This is sorely lacking functionality...