How to do strikethrough text?

Hi,

Is there an extension I need to add in order to use strikethrough text?

I have a ‘to do’ list in my game and I want items to be struckthrough when completed.

I can do the logic, but going round in google circles trying to find how to do strikethrough text.

Thanks!

[url=https://intfiction.org/t/strikethrough/10197/1]