"is a very old statement". I found this from the home page: Developers > Resources For ... > Web Programmers > CSS Property Map [0]. :)
Some questions. How does the render performance compare to modern browsers? TIScript: why?
[0]: http://sciter.com/docs/content/css/cssmap.html
On Windows Sciter uses Direct2D that is native H/W accelerated graphics rendering layer. Yet it allows to render UI directly into DirectX surface : http://sciter.com/sciter-and-directx/
2. Why TIScript ?
Check "10 years road to Sciter" article: https://sciter.com/2014/07/