alt131 - 5:11 pm on Dec 6, 2011 (gmt 0)
I thought so too until I did some further investigating. Now it seems that it was just good luck that MichaelBluejay chose gainsboro, which is a shade of grey. On closer inspection unless a border-color is explicitly set, winSafari (I don't run Chrome) reports "initial" as the border-color under element style, and if you inspect the computed style with inherited ticked that is specified as #fff (white) which resolves to #eee and #9A9A9A - shades of grey.
Interesting that in Chrome/Safari the default border-color, when using the outset style, appears to be based on the background-color, rather than the color property.
However, this is further complicated because these are links: If there is no border-color, background-color or color specified, winSafari (and also ff and ie8 but not Op11) default to link colour. winSafari defaults to the color for the visited link, but uses shades of grey based on #fff for the unvisited link. Of course the default link colours also vary.
At this stage yes - but note the effect can be simulated by explisitly setting each border colour using something like
I understand that border-outset is gonna be rendered differently in different browsers.
border-color: #eee #aaa #aaa #eee