pub fn push_class(out: &mut String, name: &str, opts: &Emit)Expand description
A prefixed class name, written into a buffer the caller already has.
The form the emitters use, and the reason it exists is escape_into’s:
putting every class on every element through a format! allocates even in
the default case, where the prefix is empty and the answer is the argument.
A described table row carries roughly eighty transient allocations that way,
and this and the escaper are most of them.
class stays for callers holding a name rather than a buffer.