On the Sci-Fi StackExchange site we often use spoiler text like this:
spoiler text example
Normally this can only be viewed via a mouse over.
How can this be viewed via an iPad?
Note: I've seen this on an iPad2.
This was "fixed" by making it possible to view spoiler text in the (very ugly on a decent sized screen) "mobile" (meaning small, not "easily moved") version of SE.
IMO this isn't fixed at all. There is a post to have it properly fixed. Unfortunately, this has been declined. The official StackExchange position is that they don't care about this problem and you should go use some other view for StackExchange if you want this to work. As far as they are concerned (according to the answer on the post from a SE employee) touch-based devices aren't enough of SE's traffic to care about, and if you want to be able to read spoiler text on a touch-based device (whether iPad or Windows 8 or Kindle Fire or anything else) you should go find some other way to view the site.
Extremely disappointing, but there's nothing we can do about this.