code: function evaluateClassName(sub, element) {
    var className = BLANK_STRING + element.className + BLANK_STRING;
  
    sub = BLANK_STRING + sub + BLANK_STRING;
    return className && className.indexOf(sub) > -1;
  }
docs: Checks whether the substring is present within element className
  @param sub Substring to check for
  @param element DOM element
  @returns {*|boolean}