Idea: Spoiler info

That would be cool if it was possible to give info on the thing that is spoiled when using spoilers
for example:

would create a spoiler box that says "This spoiler is about Batman's identity" when you hover it


and reveals "OMG batman was actually Bruce Wayne" when you click it

EDIT: of course it would still be possible to send spoilers without the hover part if you do ||OMG batman was actually Bruce Wayne||