Navigation in a browser? Like, typing a destination and getting proper driving directions - like, a lane info, real-time route updates in case of known road accidents ahead, etc?

I beg your pardon, but I think this is something yet non-existent with webapps - the best you can get is a prepared list of directions, and maybe you can set the tab to auto-update once in a while. And this is something any half-decent navigation app does.