static bool getHtmlTagParameters_debug;

// tag is CNC of the whole container tag
static S xml_getArg(L<S> tag, S name) {
  ret xml_getArg(get(tag, 1), name);
}

// s is just the tag from < to >
static S xml_getArg(S s, S name) {
  int i = indexOf(s, ' ');
  if (i < 0) null;
  while true {
    while (" \t".indexOf(charAt(s, i)) >= 0) ++i;
    int j = indexOfAny(s, i, " \t>/");
    if (j <= i) null;
    int eq = indexOf(s, '=', i);
    S key = eq < 0 ? substring(s, i, j) : substring(s, i, eq);
    if (eqic(key, name))
      ret eq < 0 ? key : htmlUnquote(substring(s, eq+1, j));
    i = j;
  }
}