code: public FormInputHandler displayed(final Boolean theDisplayed) {
  		Fields fields = new Fields(this);
  		fields.finder = fields.finder.displayed(theDisplayed);
  		return new FormInputHandler(fields);
  	}
docs: Creates a new {@link FormInputHandler} based on this {@link FormInputHandler} that requires elements to be displayed.
  
  @param theDisplayed
  restricts the {@code displayed} status of the element
  @return the new {@link FormInputHandler} instance