[request] a way to insert spoilers in posts

[ghengiz]

It may sometimes be useful to have a way to insert a spoiler in a post, for example giving the possibility to use the same color for both text and background.
I tried the "switch editor mode", right above the smilies, then "inspect element" from the mouse right-button menu, but I find the interface a bit confusing, in particular I was not able to find where to click to confirm the edits

Perhaps the simpler solution is to allow the user to change the background color or, alternatively, a new tag.