Tiptap supports Tailwind CSS

Tiptap is a headless rich-text editor framework. You add the extensions you need (bold, links, tables, slash-menus, collaborative cursors) and leave the rest out, so the bundle stays small. It plugs into React, Vue, Svelte, or plain JavaScript, and the core is MIT-licensed on GitHub.

The AI Toolkit lets you build agents that read and edit the document itself. They can see what the user has selected and where the cursor is, propose changes inline with Accept and Reject options, and stay inside the undo history like any other edit. It works with the Vercel AI SDK, LangChain, and Anthropic, so the AI you're already using can write inside the document instead of beside it.