Many previous submissions, including one with significant attention in the last year (the criterion for duplicates): https://hn.algolia.com/?query=how%20browsers%20work&sort=byP...

Honest question, is this much different than say, 10 years ago?

Other than that the page seems like an interesting resource.

There's a big difference now in that a hardware-accelerated compositor is used. It's mostly accurate up to compositing.

There are other little things that have happened recently and are worth noting—for example, Blink and WebKit are moving in a more Firefox-like direction for display list construction.

Servo, of course, has a radically different architecture.