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ee62ed7b - rfctr(html): clean types and docs in prep for HTML table parsing fixes (#2104)

rfctr(html): clean types and docs in prep for HTML table parsing fixes (#2104) There are a cluster of bugs in the HTML parsing code, particularly surrounding table behaviors but also inclusion of style elements, etc. Clean up typing and docstrings in that neighborhood as a way to familiarize myself with that part of the code-base.