That would allow it to publish to to several dozen different CMSes including WordPress, Drupal, WithKnown, Craft, Jekyll, Kirby, Hugo, and Micro.Blog among a growing set of others.
I know that iA Writer recently added Micropub support to allow people to use their tool to publish this way. Sadly they’ve only got it working as Mac/iOS clients and not as a web client, which is something at which ProseMirror might excel.
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