Mobiledoc dev here. Mobiledoc is used at Bustle (who funded initial development) on two properties, at Upworthy, Daily Beast, and on several other sites. We're extremely proud this work has also been adopted by Ghost and hope to continue working with them for a long time :-)
One of the benefits of Mobiledoc is that we provide a documented and versioned file format for serialized documents. This allows developers to share renderers for Mobiledoc content. Bustle for example publishes Mobiledoc articles to it's own HTML, to Google AMP, and to Apple News.
Mobiledoc also supports runtime-customizable "cards" for rich content. For example a writer might add a video to an article- but for each rendering environment the runtime version of that card must be different. The cards API allows developers to offer custom editing and embedding interfaces without breaking the general text editing interface.
Yeah, it's the "card" functionality that appeals to me. I was planning on building something using slate.js but Mobiledoc sounds like it will fit my needs. Thanks for responding, I'll check things out.
Is there a roadmap for Mobiledoc available anywhere? I vaguely recall seeing a 1.0 feature document at some point, but development seems to have slowed from looking at commits.
Anybody have experience with it?