1. They both can use "notepad" and both use tags and commands.
   JavaScript can make pop-up boxes and HTML cant.

2. Tevevision- input is the changing of the channels, output comes from the screen that you watch.
   CD Player- input comes from the cd that you put in the reader, output comes from the speakers you listen to

3.Both, the input was the US dollar amount, and the output was the resulting pesos amount.