position: absolute without setting top/left/bottom/right?

Question

Case #1:

I want to put a logo above the photo in the header in the default WordPress theme ( http://twentyelevendemo.wordpress.com/ )

My solution: add the

Answer 1

The standard generally says if top/bottom, left/right are auto, then default them to their position: static values:

http://www.w3.org/TR/CSS2/visudet.html#abs-non-replaced-width

http://www.w3.org/TR/CSS2/visudet.html#abs-non-replaced-height