Optional ReadonlyallowWhether an entry may name another origin — a scheme: URL or a
protocol-relative //host/… one. Defaults to false: a manifest is a
fetched document (§96), and one that can point a key at any origin can
direct every later assets.load there. Same-origin shapes (/path,
relative/path) are always accepted. Set true for a trusted CDN layout,
as createGltfLoader({ allowAbsoluteUris: true }) does for glTF.
Options for parseAssetManifest (2026-09-11).