But please, can someone explain how the REPLACED the browser rendering engine? The way I see it this is just a js framework that will abstract stuff for you and make you think at the code level that you're working with objects on a scene and not nodes in the DOM.
Kinda like threejs maybe.
I can still see div's and other usual html elements there, not even a canvas.
So I suspect the browser still renders stuff, html that the framework will generate for you. It's not clear to me what they are replacing from what the browser usually does.