// tok must come from htmlTok
// returns all container tags found (including content) as CNC
// should be OK for both HTML and XML
static LL<S> findContainerTagWithClass(L<S> tok, S tag, S className) {
  ret filter(findContainerTag(tok, tag), t -> tagHasClass(t, className));
}

static LL<S> findContainerTagWithClass(S html, S tag, S className) {
  ret findContainerTagWithClass(htmlTok(html), tag, className);
}

Began life as a copy of #1002309