I just had Codex CLI figure out where that first version ended and the new one began.

It looks to me like this is the last commit before the rewrite: https://github.com/EmilStenstrom/justhtml/tree/989b70818874d...

The commit after that is https://github.com/EmilStenstrom/justhtml/commit/7bab3d2 "radical: replace legacy TurboHTML tree/handler stack with new tokenizer + treebuilder scaffold"

It also adds this document called html5ever_port_plan.md: https://github.com/EmilStenstrom/justhtml/blob/7bab3d22c0da0...

Here's the Codex CLI transcript I used to figure this out: https://gistpreview.github.io/?53202706d137c82dce87d729263df...