Behind the warning, there was hidden text, that readers would not see unless they clicked actively.
The use is mostly to avoid revealing intrigues to people who like discovering them in the text.
Example: when you type this:
I've read End of Time volume three, the one about High Elves and Dark Elves, and I was extremely surprised to see who was killed.
[spoiler] - well, actually I did not read it, what did you expect? - [/spoiler]
it shows that:
I've read End of Time volume three, the one about High Elves and Dark Elves, and I was extremely surprised to see who was killed.
Spoiler [show]___________________________________________________________________________
Yes, I know, it does not work. If I knew how to do it, I would not have to ask, would I?
Thoughts?