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

> We weren't sure exactly how that worked - is it limited to being on "leaf nodes", as @NSoiffer alluded to above?

That's right, these make up the vast majority of links in practice though (leaf nodes)

> it would be good to have a better understanding of how authors have used href in MathML in the past - what are they linking to, and at what level, and why?

There are uses of links on mrow, which is kind of the generic grouping container for MathML.  In the same examples @NSoiffer was mentioning - if you wanted to link to an expression rather than individual tokens, you need some other facility (like making mrow linkable or adding a link element for math that is dedicated specifically to linking instead of dual purposing mrow).  Personally, while I am not keen on adding new elements, trying only to explain and subset in Core - I think in the long run a single dedicated linking element is the better/more consistent/least risk choice here.

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