Use case: User-controlled pan & zoom

[AmeliaBR]

This issue is for discussion of the use case “Reposition or scale a map to find more context for the displayed locations”, its examples & list of required capabilities.

This is the most basic user-focused use case: the website author has displayed a map of a certain area, but the user wants to pan or zoom.

I am including in the same use case all the accessibility requirements. I think it's important that we don't talk about "panning and zooming with the keyboard" as a separate feature/requirement from "panning and zooming with the mouse (or touch gestures)". One should never be implemented without the other.

[bkardell]

FWIW This seems at least somewhat spiritually related to:

• spatnav https://github.com/WICG/spatial-navigation
• a document google had thinking about a thing that is 'not quite focus' called 'interest' https://docs.google.com/document/d/1-ASYIuPpBm2cFxy_KUagakLGPc1mdF--rC9-EliqYRU/edit#heading=h.68mz6n3kt6r1
• and Focus meta-bug whatwg/html#4607 (comment) (in part because both of those and others listed here are kind of problematic because 'focus' is in a kind of bad state and probably lacks some exposed bits.

[cmhodgson]

Spatial navigation and other focus-related issues are certainly relevant to accessible map controls, but we have to be careful about the word "spatial" as its use in spatnav is relative to the HTML page layout, whereas its use in terms of MapML is more likely relative to a geographic location. (I'm sure we are all aware of this but it does need to be clear)