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The Ultimate CSS Reference 280
In Internet Explorer for Windows versions up to and including 6, select elements
always appear on top of everything else; their stack level can??™t be changed.
Internet Explorer for Windows versions up to and including 7 always use the nearest
positioned ancestor to determine the stacking context for the element in question.
Internet Explorer for Windows version 7 treats the value auto as if it were 0 (zero).
Internet Explorer for Windows versions up to and including 7 don??™t support the
value inherit.
In Firefox versions up to and including 2, a negative stack level positions the box
behind the stacking context, rather than above the context??™s background and borders
and below block-level descendants in the normal flow.
Other Relevant Stuff
position (p. 267)
specifies the positioning scheme used to position an element
overflow
overflow: { auto | hidden | scroll | visible |
inherit } ;
This property specifies the behavior that
occurs when an element??™s content
overflows the element??™s box.
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