[hutzlibu]

"Goes without saying, its a browser, browsers are never finished. "

But they can be working enough, to be useful. Meaning they can display correctly the pages you want to see.

So the best independent effort of a working browser I know of, is ladybird. And Kling knows how to build browsers, so toying around with a browser from scratch on your own will be a learning experience. But I guess you might learn more, by contributing to a project that stands a real chance to become a working browser.