@type t() :: %Docspring.Model.HtmlEngineOptionsInput{
  format: Docspring.Model.PageFormat.t() | nil,
  height: String.t() | nil,
  landscape: boolean() | nil,
  margin_bottom: String.t() | nil,
  margin_left: String.t() | nil,
  margin_right: String.t() | nil,
  margin_top: String.t() | nil,
  print_background: boolean() | nil,
  scale: number() | nil,
  width: String.t() | nil
}