A lot of time has been sunk into trying to fix keyboard especially, but it's a horrible, horrible mess — pretty much whatever you do will break websites, given

A lot of time has been sunk into trying to fix keyboard especially, but it's a horrible, horrible mess — pretty much whatever you do will break websites, given so many do if (UAx) expect_behaviour_x() else if (UAy) expect_behaviour_y() etc., so even standardising on existing behaviour doesn't work. Then there's fact that some of it is down to locales and what the current keymap is… :(