All browsers seem to further reduce the number of combinations giving different results:
* In Gecko, Safari, Opera, ‘visible’ becomes ‘auto’ also when combined with ‘hidden’ (in other words: ‘visible’ becomes ‘auto’ when combined with anything else different from ‘visible’). Gecko 1.8, Safari 3, Opera 9.5 are pretty consistent among them.
* In IE7, IE8 ‘visible’ becomes ‘hidden’ when combined with ‘hidden’.
* IE6 seems to render all combinations differently, but of course here ‘visible’ means ‘expand’ the box (in the specified direction) to enclose the content
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