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Int
Number of columns (2–6). Derived from columns.length when columns is set; if both are set they must match. Without columns, changing this pads or trims empty trailing slots.
Complete child list, length 2–6. Null items are empty slots. Replaces every child; new ids are minted from the payloads.
Int
Gap between columns in pixels.
String
Section background color.
Padding around the section.
Boolean
Stack columns on small screens.
Vertical alignment of column children.