I asked about it on meta.scifi.stackexchange.com and they told me to post it here. Probably need to add the
:active to the
:hover meta class or something like that.
Using the Android browser, this works just fine; it honors the
Mobile Safari however does not. Adding
:active, as you suggested, doesn't work either (I just tested it).
So on your iPod, you're stuck with copying the text to the clipboard (tap and hold the spoiler box, then "copy") and pasting it somewhere else (e.g. in a note).