You're right. I expect that they're reconciling with their model in JS on every keystroke. I know Quill does an interesting thing where the DOM is the canonical

You're right. I expect that they're reconciling with their model in JS on every keystroke. I know Quill does an interesting thing where the DOM is the canonical model, and the JSON model is actually derived from the DOM by a strict transformation. Because of that, it works a bit more naturally with many native mobile editor interfaces.