[css-box-4] Applying `margin-trim` to fragmentation containers
RESOLVED: margin-trim on a multi-column container trims the block-level margins adjacent to the affected edge of the column box. if your margin is adjoining the top edge of the column, the margin-trim-top applies to you, and analogous for the bottom
A resolution was made for csswg-drafts/#10761.
[css-box-4] Applying `margin-trim` to fragmentation containers
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