, Minh wrote

Isn't XAML just mark-ups for filling up a UI tree? a possible native UI tree?

I don't know if a browser canvas + javascript is ever going to be as fast as native code... I think XAML is safe for a long while

it is a "markup" language but it is used for some stuff that is not really ui but the xaml helps display a graph of the data. so it's not just for ui.