1. Both are part of the web page bacause your HTML
is what shoes up in your JavaScript.
JavaScript is just used for enhancing web pages.

2. Television input via its television control,
and/or box; output via the screen that shows 
the picture.

3. The program has both because the input is what
you type in as HTML and the output is what shows
up when you upload the file.
Currency converter program has both also because
you input your dollar amount and it gives you
the other countries amount.