html - Firefox enlarges border if nested div if position extends outside -


i'm struggling difference between webkit , firefox: if 1 div (b) nested in (a) (both having css position absolute) b geometrically outside a. desired both webkit , iexplorer do: 

|---------------|           desired !! (webkit,iexplorer) |a              | |               | |            |--|------| |            |b |      |  |            |  |      |  |            |--|------| |               | |---------------|

i.e. chrome: shows b outside a, both have expected border size

but firefox: enlarges border of go around.

|-----------------------|      firefox,  why ... ??? |a                      | |                       | |            |---------|| |            |b        ||  |            |         ||  |            |---------|| |                       | |-----------------------|

how can force firefox behave chrome/safari(and iexplorer) ? take @ https://jsfiddle.net/r29knz8z/4/

is firefox bug ?

the problem in case seems css property outline. if remove , mark boxes other way (border, background-color or that), example displayed correctly in firefox well.

according this article, though it's few years old, firefox has problems outline. might idea replacing in code.


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