First alpha builds of Firefox 3.6 shows Gecko support for 'inset' parameter in box-shadow CSS declaration. Discussion on Mozilla's Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=476738 Mozilla MDC page: https://developer.mozilla.org/en/CSS/-moz-box-shadow
Created attachment 28967 [details] Bug HTML test case. HTML testcase that could be tested against first Firefox 3.6 alpha builds.
Created attachment 28969 [details] Screenshot of Firefox 3.6 alpha reference rendering.
The working draft of CSS3-background says this about box-shadow inset property: "The ‘inset’ keyword, if present, changes the drop shadow from an outer shadow (one that shadows the box onto the canvas, as if it were lifted above the canvas) to an inner shadow (one that shadows the canvas onto the box, as if the box were cut out of the canvas and shifted behind it)" http://www.w3.org/TR/css3-background/#the-box-shadow
*** This bug has been marked as a duplicate of bug 27582 ***