Just today I ran into a weird bug in Google Drive's document editor where selecting 'paste without formatting' from the context menu resulted in a pop-up saying 'These actions are unavailable via the Edit menu, but you can still use: Ctrl+C Ctrl+V Ctrl+X'.
This is not a weird bug. It’s Google tailoring their products for their own browser and ignoring the others (Safari has the same “issue”). It’s their prerogative to do so, but I think they’re risking getting hit by antitrust for these kinds of antics in the future.
In Chrome: no problem at all.