Block-level elements assigned to this zone. Laid out independently of all other zones.
OptionalidOptional identifier for the zone (for debugging and future linked-frame support).
OptionalregionOptional explicit region geometry in zone-field local/world coordinates.
OptionalstylePer-zone style overrides (e.g. backgroundColor for the zone cell background).
A spatial region on a
zone-mapelement.A ZoneDefinition is NOT an Element — it is a region descriptor. It has no
type, nochildren, and no DOM-style nesting semantics. It describes a bounded area on the page map and the actors (elements) assigned to inhabit that area. Each zone runs an independent, non-paginating layout pass.