Lemmy spoilers have different syntax compared to reddit:

This is a spoiler hiding some text

We’re no strangers to love
You know the rules and so do I (do I)
A full commitment’s what I’m thinking of
You wouldn’t get this from any other guy
I just wanna tell you how I’m feeling
Gotta make you understand
Never gonna give you up
Never gonna let you down
Never gonna run around and desert you
Never gonna make you cry
Never gonna say goodbye
Never gonna tell a lie and hurt you
___

For some reason, spoiler tags don’t work on my end. I use Connect.

Same on Thunder.

Same on Liftoff

Very few clients support the custom ones, e.g.

^sup^

~sub~

This

One