Some months ago, I was reading the old posts, and I found one which wrote spoilers in this way: Hover a certain text for ≈1 second to reveal a yellow box like the ones that explain how to use things. THat box has the spoiler. Some time later I saw that post again and, because I was curious of how it's done, I quoted it. Some weeks ago I decide to post about this. Only now I quoted the post again to see the exact code and posted about this here here's how you used the code:
[abbr=(the hidden text)](text you need to hover to read the hidden text)[/abbr]
Write exactly like it's shown without quoting (to prevent transformation, I used the nobbc code, explained before in this forum).
Try it here:
Hover this for ≈1 second.I think that this is better than highlighting white/gray text.

Highlighting itself is harder than hovering (I think?), using white doesn't make it completely hidden (it's still hard to read, though), and it's hard to find the two exact background colours. What do you think?