Question

Is there a way to post spoilers, i.e text that only appears if you mouse over it, or click a button?

Answer 1

hmmm you could post in LaTeX and make it white. :/ that's the only thing I can think of.

Answer 2

\[\Large\textit{five}+\textit{five}=\color{white}{\textit{ten}}\]

Answer 3

`\text` helps: \[\text{five}+\text{five}=\color{white}{\text{ten}}\]