When you throw a picture into the
otherwise working spoiler markdown.
Like this:
>! ![The nicest tux ever.][1]
Then you notice that, surprise, surprise,
It doesn't work. I.e. the picture is not hidden when the spoiler box is not being hovered over.

:hover.. I'd call this "by design", if I had to guess, since it would've been the simplest and most cross-browser way to do it. – Izkata Jul 31 '12 at 1:58.spoiler img {display:none;}as.spoiler:hover img {display:inline;}. – bitmask Jul 31 '12 at 2:02opacityCSS, but it's not cross-browser, you have to use specific attributes for specific browsers IIRC. – Izkata Jul 31 '12 at 2:22{visibility:hidden;}– Keen♦ Aug 7 '12 at 14:51