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Re:Ritzy – A collaborative web-based rich text editor by oever on Sunday August 23, 2015 @04:33AM (#10105023)
What is the file format? WebODF has all the mentioned features, includeing collaborative editing, and in addition it uses OpenDocument Format as the file format.

http://www.webodf.org/demo/

Re:Ritzy – A collaborative web-based rich text editor by rocketraman on Monday August 24, 2015 @06:42AM (#10108890)
The primary data structure underneath is a "causal tree" CRDT. However, import/export to a JSON structure representing rich text is the "native" format. Example is the source used to create the text in demo instances of the editor:

https://github.com/ritzyed/ritzy-demo/blob/master/src/create...