Encoding the Buttons
encodeDecrementButton must write an input HTML element with
attributes: 
-  type: = "submit"
 -  name: to be used during decoding (must be unique from the input
     field) 
 -  value: = "<"
 
encodeIncrementButton must write an input HTML element with
attributes: 
-  type: = "submit"
 -  name: to be used during decoding (must be unique from the input
     field and the decrement button) 
 -  value: = ">"