Keyboard navigation: Focus directly on and highlight selections in right click menu when open

[danieldegroot2]

Description

On right click,

• set tabbing to focus on the right click menu. Tabbing will then select the second/next item in the right click menu. This is the case at least for Google Maps, Bing Maps, ... .
• add a highlight for selections within the right click menu (at least, those other map providers do)

Currently, when the right click menu is open,

• Tab goes through the normal cycle (the page as a whole is being selected); also when routing
• Eventually selects within the tab menu but has no highlights so the user is not, at least not visually, aware of this.

Google:

Bing:

(the url preview in the bottom left corner of the browser doesn't update properly, but let's not try to troubleshoot this unless you really want to)

Screenshots

No response

[tomhughes]

The context menu is a third party component (https://github.com/aratcliffe/Leaflet.contextmenu) and as far as I can see it does not offer any option to control this behaviour.

[danieldegroot2]

Partial duplicate of aratcliffe/Leaflet.contextmenu#135.