Jan Schaumann @jschauma@mstdn.social
Public

I finally jotted down a table of in how far the big three browsers currently support RFC9460 HTTPS records.

In summary:
- All browsers support ALPN
- Safari has the best support; it's the only browser that supports AliasMode, but Safari doesn't support ECH
- Firefox requires DoH, but then supports several parameters
- Chrome only support ALPN and ECH

See this page for details, I may update it in the future:
netmeister.org/blog/https-cani

A table mapping browsers to capabilities: Chrome Firefox Safari AliasMode ❌ ❌ ✅ ALPN ✅ ✅ ✅ ECH ✅ ✅ ❌ IP Hints (no A / AAAA) ❌ ❌ ✅ IP Hints (with A / AAAA) ❌ ✅ ✅ Port ❌ ✅ ✅
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