Hi guys,
I just ran into this problem:
A parent div with -webkit-transform: translate3d(0, 0, 0) in its CSS.
Apparently, this is a known source of potential mayhem in child elements with position: fixed.
They won’t size to fit the whole window. The will size to fit their parent! Big boo-boo.
The solution was to append it to the page body element and use ID-s for each of them.