[1] = Mostly the same feature set is also provided by LibreSSL, BoringSSL, AWS-LC and quictls [2] = OpenSSL 3.2 has a QUIC stack that curl works with experimentally. The OpenSSL forks LibreSSL, BoringSSL, AWS-LC and quictls support the QUIC API that curl works with using ngtcp2. [3] = mbedTLS has TLS 1.3 marked no because it does not work with with curl, even if the library claims (partial) suppor