// tok must come from htmlTok
// returns all container tags found (including content) as CNC
// honors nested tags correctly
static LL<S> findContainerTagWithParams(L<S> tok, S tag, O... params) {
  new LL<S> l;
  for (L<S> t : findContainerTag(tok, tag))
    if (htmlCheckParams(second(t), params))
      l.add(t);
  ret l;
}

static LL<S> findContainerTagWithParams(S html, S tag, O... params) {
  ret findContainerTagWithParams(htmlTok(html), tag, params);
}

Began life as a copy of #1002309