If the browsers incorporate complex editors, they're likely to be subtly or even wildly different from each other in behavior. What's the "correct" behavior aft

If the browsers incorporate complex editors, they're likely to be subtly or even wildly different from each other in behavior. What's the "correct" behavior after hinting enter in an unordered item list, create a new bullet or start a new line for the current one? Is there a popup to create links when you highlight text? Can a heading be split over multiple lines? Some of the answers depend on the constraints of your underlying storage format like Markdown vs HTML. On the other hand, if I pick ProseMirror or Draft.js, I can be reasonably secure in that the behavior is consistent for my users. If a capability can be implemented outside of the core browser, I think it's a good idea to do so. It's sort of like putting something into the Linux kernel vs doing it in a userspace module. The kernel/browser should provide the low-level hooks for userspace to innovate, not try to incorporate userspace components. An external project can iterate more rapidly, and there's also a lower barrier for people to contribute code and fixes. Duplicate projects "waste" resources, but they're also competing with each other and that improves quality in the long run.