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;

  }

}