Function retired_view_form 

pub fn retired_view_form(line: &str) -> Option<RetiredForm>

The retired form line is written in, read from the WHOLE line and only in the dialect’s exact shapes, so text that merely mentions a tag word (a: first option, Note: see below) is not one: an HTML element name, optionally a bracketed attribute list, then : and nothing, a string literal, or a call; or css followed by a string literal.