not sure, they do something with the GPU for sure, and because how are you going to draw anything on a monitor or screen without a rendering engine? Surely in their code base they have multiple levels of abstraction for rendering, drawing, and layout in their code base. You can see these kinds of things in other comments here and on their github without reading code.

The browser engine is itself an abstraction point that many people find agreeable on both sides, for those of us that don't have a problem with chromium/codium/electron as a technology, seeing it more so as useful and enabling

In my mind, sharing a common engine across chromium/codium/electron is like how so many things use the linux kernel. To me, the more eyes, devs, and consumers of the code makes it better in the long run