No. Webreneder is a graphics renderer/library very similar to skia, however webrender is developed by mozilla, written in rust and used in firefox and servo. It basically gives emacs GPU acceleration since cairo doesn't have it IIRC.

>allow emacs to be used as a web application

I think that it is already possible if you compiled emacs with gtk3/pgtk as toolkit of choice and use Broadway GDK backend.

> WebRender is a GPU-based 2D rendering engine written in Rust from Mozilla. Firefox, the research web browser Servo, and other GUI frameworks draw with it. emacs-ng use it as a new experimental graphic backend to leverage GPU hardware.

No.