That’s a good point. Using Puppeteer or a headless browser gives you essentially full web platform support. The tradeoff is that it comes with a heavier runtime and more moving parts (Chromium, Node, etc.). PlutoPrint aims to be much lighter: no browser dependency, just a compact C++ engine with a Python wrapper. It does not cover the entire browser feature set but it is fast, portable, and easy to drop into projects without the overhead of a full browser.
We're doing a very similar thing (custom lightweight engine) over at https://github.com/DioxusLabs/blitz. We have more of a focus on UI, but there's definitely overlap (we support rendering to image, but don't have pagination/fragmentation implemented).
Have you run the WPT tests against your engine to test spec conformance?
Your approach is also more predictable. Trying to figure out why Chromium is doing something strange with a complicated page is not practical, while a simple, lean package like this means you can look at the code, trace it and patch it if need be.
