PDF glossary
Cross-origin isolation
A browser mode, turned on by the COOP and COEP headers, that a page needs before it can use SharedArrayBuffer and WebAssembly threads.
A page is cross-origin isolated when it is served over HTTPS with Cross-Origin-Opener-Policy: same-origin and Cross-Origin-Embedder-Policy: require-corp. Every resource it loads must then allow it.
In PDF-SDK
The web editor needs a cross-origin isolated page; the web guide shows the headers for common hosts.
Web guide: hostingLast reviewed