depends on media-query-parser and media-query-solver.

prefers-color-scheme,map-projection,map-zoom working up to the initial
matches.  Tbd if this will need modification to support dynamic
evaluation of map properties to support attaching event handlers.

Not yet determined: how to implement map-extent support, because media
features are all either discrete or range types, and while it may
be possible to implemnent a bbox using four corner values as the 
pre-determined corners of the bbox, it is less clear how to represent
a bbox as a media feature value, which does not typically contain 
commas.

(relies on M.options.contentPreference being an array).

allowing dynamic use of the object in event handlers.

Add window.matchMedia query + event listener for color-scheme changes,
allows map to adapt without having to shake it.

returns false

…age,

not navigator.languages, because other values aren't of use).