Why not an online tls parser?

[Ayms]

Since we are there... illustrating is great, (simple) direct parsing would be also

[syncsynchalt]

Happily there is already a solution for this via wireshark. You'll need to provide a pcap and the session secrets (can be captured from the browser or openssl by various means) and wireshark does a great job of giving field-by-field breakdowns.