[css-grid-3][masonry] Baseline alignment in the masonry axis #9530
Description
The baseline-alignment section is a lot simpler after removing the align/justify-tracks properties, but it does raise a few questions:
- Do we want to support baseline alignment in the first row? (It's theoretically possible, but a little complicated given the possibility of explicit placement.)
- Where should the last baseline come from:
- the last placed item?
- the lowest item?