How vertical alignment works — auto by default, forced with a {top}/{center}/{bottom} marker.
One short block and no marker, so this slide is centered automatically.
This slide has prose and two blocks, so it auto top-aligns — dense content reads better flowing from the top than floating in the middle.
| Weight | Alignment | |
|---|---|---|
| Light (≤1 block | little prose) | Centered |
| Heavy (2+ blocks or lots of prose) | Top |
Same light content as the first slide, but {top} in the heading forces it to the
top regardless of weight.