Hello all!

I was looking through the W3C CSS1/CSS2 specs, and I came to the realization that none of the following are listed?

position: absolute;
left: XXpx;
top: XXpx;

And yet when you validate a stylesheet containing any/all of the above, it validates .. am I missing something here?
Are "position", "left" and "top" mentioned in the W3C documents somewhere and I just missed it, or does the W3C validator simply ignore them?