browsers have tried that, and it doesn't do any good because the phishers just make a long enough domain that the bolded part gets pushed off the screen.
how would it look for this
I think that feature got lost again in the recent rewrite, though...
(Adds the idea to the list of things he wants in his 'Ultimate Browser' that one day he'll write.)
Putting some ugly characters in it isn't really any different to just hiding them