[dave2000]

That's because the web is a terrible platform to develop for - because it's essentially a text-with-graphics platform with about 20 million different extensions, standards and so on to deal with. So the choices are:

1) deal with it 2) pick a better platform 3) try and come up with a new platform which is broswer-like but where there is predictable, obvious behaviour on multiple implementations of the platform, and where the platform supports, out of the box, all the sorts of functionality you'd like for a modern app. If your platform is missing any of the APIs you have available on, say, Android or ios you're going to struggle to make a web app as rich as, say, google maps, or whatever.

I'd for for 3 but I guess it's hard because all the people who care are too busy trying to keep up with which framework to use, or centering text, or whatever.