Perhaps a better comparisson is this: https://github.com/servo/html5ever/blob/master/html5ever/src/tokenizer/mod.rs#L683 https://github.com/servo/html5ever/blob

Perhaps a better comparisson is this: https://github.com/servo/html5ever/blob/master/html5ever/src/tokenizer/mod.rs#L683 https://github.com/servo/html5ever/blob/master/html5ever/src... https://html.spec.whatwg.org/multipage/parsing.html#data-state https://html.spec.whatwg.org/multipage/parsing.html#data-sta... Where spec: U+0000 NULL -> This is an unexpected-null-character parse error. Emit the current input character as a character token. translates into: FromSet('\0') => go!(self: error; emit '\0'), If you ignore the FromSet which is used for small set of characters, and `go!` which is a macro, you get something akin to: '\0' => emit_error; emit '\0'