[css-d] with padding inside that has "overflow: auto"

[medial | André Huf]

Hello,
 
can anyone explain why there is a horizontal scrollbar for a div in
Firefox if there is a ul with “padding: 0;” inside it? 
 
And why the padding disappeares if I set the padding to at least 8px for
example?
 
The ul’s have list-style-type:none; - but it does happen without that
rule – only takes larger values
 
I set up an example page:
http://dev.electroschore.de/uloverflowautotest.htm
 
Doesn’t occur in IE
 
Thanks for your answers
 
André
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