getLayoutMap() returns keyboard layout on Chrome-based browsers

[jasongrout]

Early on in the keyboard shortcut code, we were frustrated that we could not get the keyboard layout in the browser (to accurately represent/determine keyboard shortcuts across different layouts). FYI, there is a partially supported getLayoutMap() function these days.

It seems that Firefox and Safari are refusing to implement it for privacy/fingerprinting reasons (see WICG/keyboard-map#30 (comment) and mozilla/standards-positions#310).

Chrome is providing better access to it in Chrome 97: https://chromestatus.com/feature/5657965899022336

Since Firefox and Safari are not supporting it, I think there is perhaps nothing to do here, but wanted to document the progress in the browsers in this area.