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I was hoping for a solution that would scale images enough so that lines
were not broken.  (Alignment for boards with different rank sizes is
another issue, which I had not considered yet.)  I was looking for a way
that the js output could be treated as a single object to be scaled to fit
the screen; perhaps flattening to a single image would do that in addition
to being better for other reasons.

By "transition to single images hosted on this site" do you mean on the
author's end?

For ASCII diagrams I am mostly concerned with old pages (90s ones :P) that
already use them (and whose authors might no longer be active).  I suppose
changing msdisplay to add P tags and a monospace font will make any
"non-HTML" page without an ASCII diagram better on mobile, and will make
such pages with a wide ASCII diagram bad on mobile, but just in a different
way than at present.

I had thought about introducing a more sophisticated text entry method
(e.g. CKEditor or TinyMCE), which could render "Uses HTML" obsolete (for
future pages): every page would use HTML, but the user wouldn't need to
worry about coding.  On top of that, we could be a little more careful
about what we allow our users to submit (whitelisting html elements and
customizing to allow Muller's [diagram], the ffen2diag script, etc.).  If
we think we want to and can manage to move to a third-party CMS, then I
won't keep looking into this.  (This is outside my tech comfort zone, so
it would take me a while anyway.)