I've seen some members have a "spoiler" in their signature, and when you click it expands to show some text, specifically several have done this in relation to the 3017 challenge to use product, and when you click on the spoiler it expands to show a list of specific product and dates. I've read and understand how to post a spoiler in a regular post like this
but how to I get this to work in my signature?
Even I can figure this out