There are other use cases for (preserved) HTML comments in (or produced by) JSX, but generally more for library authors than end users. For example, comments ca

There are other use cases for (preserved) HTML comments in (or produced by) JSX, but generally more for library authors than end users. For example, comments can be used for hydration markers to delineate “hydration islands” without need for a wrapping element. (I have a proof of concept of this sitting in a Codepen somewhere.) And while it doesn’t work in React’s Fragment, it can certainly work with another compiler. JSX doesn’t specify anything about what it compiles to, React.createElement/_jsx are just defaults.