If you are looking for a modern, modular editor, with a custom data model and collaboration check CKEditor 5 (https://ckeditor.com/docs/ckeditor5/latest/features/index.ht... and https://ckeditor.com/ckeditor-5/). It comes with decent mobile and Edge support already (Electron is supported too). Paste from Word will be delivered within 2-3 weeks. For collaboration we already offer a complete and stable solution out of the box where you don't have to code anything. If you are curious check https://ckeditor.com/blog/Lessons-learned-from-creating-a-ri...