What does 'is an instance of' mean in Javascript?

Question

The answer to this question: What is the initial value of a JavaScript function's prototype property?

has this sentence:

The initial value

Answer 1

So now I have fabricated a page describing what I think all you guys* are saying: https://docs.google.com/document/d/1VvqqO2LMmilLbIvcU2JHI9ifaoMs-DB-farEzwuVuwM/edit?hl=da

illustrated with nice graphics :)

regards Jon

*and this link: http://trephine.org/t/index.php?title=Understanding_the_JavaScript_new_keyword