Play with sandbox
From Electrical Installation Guide
you can use this page to test wikitext language, it is free to modify by anybody
Equations can use color:
It is also possible to change the background color (since r59550), as in the following example:
|Background||Wikicode||Rendering (in PNG)|
Note that color should not be used as the only way to identify something, because it will become meaningless on black-and-white media or for color-blind people. See Wikipedia:Manual of Style (accessibility)#Color.
a2 − b2 = (a + b) * (a − b)