Fragment Styles

There's different types of fragments, like:

grow

shrink

fade-out

fade-up (also down, left and right!)

current-visible

Highlight red blue green

Transition Styles

You can select from different transitions, like:
None - Fade - Slide - Convex - Concave - Zoom

Themes

reveal.js comes with a few themes built in:
Black (default) - White - League - Sky - Beige - Simple
Serif - Blood - Night - Moon - Solarized