In 2020, Steve Kobes did a talk on “the life of a pixel” and how Chromium turned Web content into pixels on a screen:
A tour of the internals of Chromium’s rendering architecture, tracing the steps in the pipeline from web content to display pixels. Concretizes high-level concepts with pointers to important classes and data structures in the codebase
It’s a great entry-level talk for those interested in the Web and how various concepts and systems work to get digital code and content to a state where it can be visually presented.