If you haven't seen it, then you shouldn't even be in this thread...the one that YOU made spoiler-friendly! What's the matter with you?
I've got no problem using spoiler tags, but I notice they don't seem to show up on iOS. Or at least that was the case a year or so ago.
Spoiler (click to toggle):
EDIT: still the same...you see the stuff in a little box labeled "spoiler", but it's not blacked out on iPhone, so it's totally visible...it's just inside a little frame/box.