Have you considered using ProseMirror [1]? It's a nice wrapper around contenteditable that makes things like inline math editing [2] much easier to set up. [1]

Have you considered using ProseMirror [1]? It's a nice wrapper around contenteditable that makes things like inline math editing [2] much easier to set up. [1] https://prosemirror.net/ https://prosemirror.net/ [2] https://github.com/benrbray/prosemirror-math https://github.com/benrbray/prosemirror-math