The specifications
Here is a collection of the RFCs for the various parts and components of QUIC and HTTP/3.
Version Negotiation
Compatible Version Negotiation for QUIC
Transport
QUIC: A UDP-Based Multiplexed and Secure Transport
Recovery
QUIC Loss Detection and Congestion Control
TLS
HTTP
Hypertext Transfer Protocol Version 3 (HTTP/3)
QPACK
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