miniblog.

I've noticed that data small enough to fit in your clipboard rarely gets saved to an individual file. You get collections of data, but it would be odd to save a single URL to a file. The clipboard less persistent, but it's incredibly convenient.

Superb article on building a real time rich text editor: https://ckeditor.com/blog/Lessons-learned-from-creating-a-rich-text-editor-with-real-time-collaboration/ Discusses operational transforms with hierarchical text (e.g. you edit text whilst the other user makes part of it a link) and markers (persistent regions that automatically move when you edit).

Hack, the PHP dialect, uses a persistent hh_server so linting, finding definitions etc is fast. Whilst this is a more common model today (language server protocol, YouCompleteMe), it's an interesting design considering PHP is based on short-lived processes.