Mozilla Developer Network CSS

Triggers: !css, !mdncss

Try it

Kagi would openhttps://developer.mozilla.org/en-US/search?q=string+formatting&topic=css

Run !css in Kagi

URL pattern: https://developer.mozilla.org/en-US/search?q=query&topic=css

Searches developer.mozilla.org, filed under Languages (html).

Other bangs for developer.mozilla.org