[tex4ht] "page is empty" messages. But nothing seems wrong in the HTML

[Karl Berry]

    much faster than using Vbox or cygwin or miktex on windows.

I wonder if the issue is dvisvgm needing to call out to an external gs
process on these Windows machines, instead of linking against libgs.

Anyway, if you want to pursue it further, the author of dvisvgm is
Martin Gieseking <martin.gieseking at uos.de>. I imagine he might be
interested in your experiments even if there is nothing to be
done. --best, karl.