Yeah, ok, so we have essentially PDF -> SVG -> PDF/PS because of too many abstractions. It would make sense to expose some internal printing API to the embedded PDF reader so all this nonsense wouldn't be necessary.
Firefox tried to with mozPrintCallback specifically for pdf.js, then went away from that. Not sure what happened behind the scenes exactly as they wanted to get it standardized for canvas printing.
Printing is a forgotten corner on the web, would be nice if a mainstream browser implemented the full css print spec too so we could create page perfect output without relying on PrinceXml...
Printing is a forgotten corner on the web, would be nice if a mainstream browser implemented the full css print spec too so we could create page perfect output without relying on PrinceXml...