fileInput(inputId, label, multiple = FALSE, accept = NULL)input slot that will be used to access the value.NULL for no label.actionButton,
  actionLink; animationOptions,
  sliderInput;
  checkboxGroupInput;
  checkboxInput; dateInput;
  dateRangeInput; numericInput;
  passwordInput; radioButtons;
  selectInput, selectizeInput;
  submitButton; textInput