Re: [w3ctag/design-reviews] MathML Core (#438)

The explainer is in really good shape now, thank you!

A couple of general comments from discussions I've had with other TAG folks:

- Overall, there is some tension in the choice of core elements between whether the elements are expressing semantics or layout. e.g. `<mn>`, `<mi>` and `<mo>` seem to be expressing semantics, while `<menclose>` is purely layout.
   - `<mrow>` is somewhere in between - mostly useful as a "group" directive, but the notation somewhat makes the intended use feel like a layout directive. Is there any chance that this could be generalized to something like `<mgroup>`? 
- What is the meaning of "legacy compat" in this context? It doesn't seem to be called out in the spec.
- How is this parsed? Do all the elements need to be explicitly closed?

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