code: function checkCombinator3(i) {
    const type = tokens[i].type;
    if (type === TokenType.PlusSign ||
        type === TokenType.GreaterThanSign ||
        type === TokenType.Tilde) return 1;
    else return 0;
  }
docs: (1) `>`
  (2) `+`
  (3) `~`
  
  @param {number} i
  @return {number}