@federicomena @ted For example (warning: 2MB SVG file):
Texas:
https://people.redhat.com/~glesage/tmp/timezone/time_zones_countryInfo-mod.svg#m5
...versus Europe central:
https://people.redhat.com/~glesage/tmp/timezone/time_zones_countryInfo-mod.svg#p1
This was just a demo to highlight to prove it worked; I didn't have the part where it wasn't highlighted in the same file.
(IIRC, this or something very close to it was used in Anaconda with rsvg afterward, for smaller file size as well as HiDPI support after I proved it could work. But it works in browsers also…)