Wikipedia "Spoiler" button

Hi there!

I always wondered if that only happened to me.

You're just browsing for some information on a movie, TV show, game, anything with a story, and while looking for a particular information you end up having a part of the story spoiled since they usually put the piece of information you need right beside the whole story description.

I'm calling up for a Spoiler filter on Wikipedia that could hide some elements on the site unless you put the filter to off. This way all the information is there, but not necessarily revealed outright.

I have a small mockup on how it could look like on my site:

Basically it would be a ON/OFF like button on the top of the page and some blocks you can show manually, but I'm wondering if Wikipedia managed to spoil you anything or if I'm the only idiot who felled for the trap...