static double nodeMatch_dollarVars(WebNode a, WebNode b) {
  if (isDollarVar(a.text())) ret isDollarVar(b.text()) ? -1 : 0;
  for (S s : web_texts(b))
    if (!web_hasLabel(a, s))
      ret -1;
  ret 0;
  //ret containsAll(web_ucTexts(a), web_ucTexts(b)) ? 0 : -1;
}