There's different types of fragments, like:
grow
shrink
fade-out
fade-up (also down, left and right!)
current-visible
Highlight red blue green
You can select from different transitions, like:
None -
Fade -
Slide -
Convex -
Concave -
Zoom
reveal.js comes with a few themes built in:
Black (default) -
White -
League -
Sky -
Beige -
Simple
Serif -
Blood -
Night -
Moon -
Solarized