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Take a look at this picture: 
it is a zoomed screenshot from this jsfiddle.So, what is the purple border around red bar?o_O It looks bad, and furthermore, thereafter in real application I get it in even more strange way: 
– somewhere it exists but somewhere dont.
Better pics: 
So, we solved this problem on math.SE, as a shortcut – width and height should both be of the same parity (i.e. either both odd or both even) (thanks Steven Stadnicki).