@type anchor() :: :top | :flow | :bottom | :fixed

@type role() :: :header | :body | :footer | :sidebar | :custom

@type t() :: %Rendro.Region{
  anchor: anchor(),
  height: number() | nil,
  name: atom() | String.t() | nil,
  role: role(),
  width: number() | nil,
  x: number(),
  y: number()
}