Everything in milkdown are plugins. Extend your editor with different types of plugins: syntax, theme, UI, etc.
With the support of Y.js, milkdown can be used in real-time collaborative editing.
Milkdown is headless and comes without any CSS. You can easily customize the editor to fit the style of your application.
Milkdown is built on top of some great libraries, such as ProseMirror, Y.js, and Remark. Which means you can use their community and eco system to get help.