Rust streaming HTML parser/rewriter

This post details the development of LOL HTML, a Rust-based streaming HTML rewriter/parser with a CSS-selector based API, which serves as the backend for Cloudflare Workers' HTMLRewriter. It introduces a dual-parser architecture (lexer and tag scanner) to optimize performance by skipping non-matching content and avoiding expensive token propagation to the Workers runtime. It also describes a Rust macro-based DSL for defining Nondeterministic finite automata for parsing and byte slice processing optimizations using token outlines for lazy transformation into byte slices.