lib/watir-formhandler/container.rb
def fill_in(label, value, start_node: nil, placeholder: false, id: false)
      field(label,
            start_node:     start_node,
            placeholder:    placeholder,
            id:             id
      ).set(value)
    end
def fill_in(label, value, start_node: nil, placeholder: false, id: false)
      field(label,
            start_node:     start_node,
            placeholder:    placeholder,
            id:             id
      ).set(value)
    end
Fills in the given value(s) to the passed attribute. It therefore accepts the same parameters
 as the #field method.
 @param [String, Watir::Label] label the label for which to find the form field.
 @param [String, Boolean, Array] value to be set.
 @param [Watir::Element] start_node the node where to start searching for the label.
 @param [Boolean] placeholder whether to handle label as Watir::Label or as placeholder
                              attribute for an input field.
 @param [Boolean] id          assumes the given label is an HTML ID and searches for it.