modName() {
    if (this.modStack.length === 0) return "normal";
    else if (this.modStack[0] === "mono") return "mono";
    else {
      if (this.bold && this.ital) {
        return "boldital";
      } else if (this.bold) {
        return "bold";
      } else if (this.ital) {
        return "ital";
      }
    }
  }
Return the mod label currently active
@returns {string}  label of active mod
@private