Is there a table of implemented RFCs? Something similar to http://caniuse.com where we can see what HTML/JS/CSS standards and features are implemented? If it exists, I can't seem to find it. Closest thing seems to be "experimental features" page but its not quite detailed enough.
https://doc.servo.org/apis.html is auto-generated from WebUDL interfaces that exist in Servo. It's not great but better than nothing.
Closest is perhaps the web platform tests
Their bloghas monthly posts on changes https://servo.org/blog/
Oh, I forgot that https://arewebrowseryet.com/ exists for this too!