Test case: http://jeff.ecchi.ca/?e=dessins This works fine with Firefox and IE, but Chromium and Epiphany 2.30 fail to render the borders around the images in that gallery.
Created attachment 57602 [details] reduced test case
It's not "1px solid black" - the site has commas in this CSS rule, so the rule is (correctly) ignored. The color you're seeing comes from color rule - in Firefox, the image magically becomes larger inside an anchor element. I haven't tested IE.
*** This bug has been marked as a duplicate of bug 18395 ***