By standard I mean the unwritten standard set by the original terminal clients. As I said above, it appears to me (but I could be wrong, and if I am so be it) that what the terminal clients could do was limited by the terminal. Now, a terminal (BASH, for my example) is able to do those colours, bold fonts, underline but it doesn't appear (at least I personally have never seen it) to be able to produce italic text. If this is not the case, then fine...
By interfere, I mean the displaying of the italic markers by clients that don't support italics. It would be annoying to see 'em
