This page is to list syntax options, which are not well describe on the help pages:

Linebreaks within a table are not permitted per se, but if you enclose them in an html-command, such as <code> </code> they are still possible.

GitLab markdown does not contain the full set of LaTeX Math commands, available are: https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX