There's an opportunity for this to happen by taking some time to just read through CSS 2.1 and implement the renderer. So much of the web is driven by that port

There's an opportunity for this to happen by taking some time to just read through CSS 2.1 and implement the renderer. So much of the web is driven by that portion of spec alone. Then, you could tack on whatever other programming language you wanted to play around with. It doesn't even necessarily have to be JavaScript. Most people don't even succeed implementing CSS 2.1, though. It takes a non-neglible amount of time.