[tex4ht] text/html with mathjax as small mod of tex4ht/xhmlatex

[William F Hammond]

It's not clear to me how to configure things so that html5
(text/html serialization) with mathjax is spun out of
tex4ht, but small ad hoc adjustments to the examples from
arXiv referenced below suggest that it ought to be fairly
easy to create a variant of xhmlatex for it.

    http://www.albany.edu/~hammond/demos/Html5/arXiv/

                                    -- Bill