While I drag a tab, :hover is applied to the element(s) at the location of the cursor at which the drag began. After I drop the tab, that continues to occur until I move the cursor again. I discovered this while working on bug 455694. I'm filing this in Core -> Style System (CSS), although it might be a bug in the drag-and-drop code. Please move if appropriate.
The same is true for :active (bug 379272).
I think this could be caused by the drag api not sending mouseover events.
which would also (according to bugs 674925 and 505221) be a result of using the drag api, which doens't fire mousemove events, so there are no hover events. that would mean that this is blocked by bug 505521.
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