Coming from T257239#6321511, we've run into the current code output by Autoprefixer to only output styling alongside Grade A supported browsers, meaning that only latest two versions of Firefox/Chrome are getting prefixed CSS delivered.
As we're not relying on feature detection, we might end up in full feature supported browsers (specifically Grade X) with limited styling.

Acceptance criteria

• Define browser support list
• Ensure on technical level (linting, prefixing) to follow support list
  • .browserslistrc is revised. Ideally, if a change passes the browserslist inspection it should be considered compatible.

Dev notes

This is the current output of npx --no-install browserslist, following Grade A browser list:
android 81
android 4.4.3-4.4.4
android 4.4
android 4.2-4.3
android 4.1
chrome 83
chrome 81
edge 83
edge 81
firefox 78
firefox 77
ie 11
ios_saf 13.4-13.5
ios_saf 13.3
ios_saf 13.2
ios_saf 13.0-13.1
ios_saf 12.2-12.4
ios_saf 12.0-12.1
ios_saf 11.3-11.4
ios_saf 11.0-11.2
ios_saf 10.3
ios_saf 10.0-10.2
ios_saf 9.3
ios_saf 9.0-9.2
ios_saf 8.1-8.4
ios_saf 8
ios_saf 7.0-7.1
ios_saf 6.0-6.1
opera 69
opera 68
safari 13.1
safari 13
safari 12.1
safari 12
safari 11.1
safari 11
safari 10.1
safari 10
safari 9.1
safari 9
safari 8
safari 7.1
safari 7
safari 6.1
safari 6
safari 5.1