Content Display Areas are based on the aspect-ratio derived
from the publication's fixed-layout documents, if any exist.
Otherwise, the aspect ratio is derived from the publication's cover image.
When the publication lacks both fixed-layout pages and cover image,
the configurable fallback value is used instead.
Note: When this type is used, additional publication data might need to be fetched.
This may negatively impact the time until first page rendered if the publication is streamed
over the internet.
Content Display Areas are based on the aspect-ratio derived from the publication's fixed-layout documents, if any exist. Otherwise, the aspect ratio is derived from the publication's cover image.
When the publication lacks both fixed-layout pages and cover image, the configurable fallback value is used instead.
Note: When this type is used, additional publication data might need to be fetched. This may negatively impact the time until first page rendered if the publication is streamed over the internet.