CSS is short for Cascading Style Sheets (CSS), and typically includes the full set of Selectors, CSS properties, values, and @-rules supported by browsers.
CSS is one of several web standards.
For documentation on CSS, how to develop for it, use various properties, see:
Please add subpages for each (unprefixed) CSS property in alphabetical order.
- 2019 Metabug for CSS Priorities: https://bugzilla.mozilla.org/show_bug.cgi?id=1424418
- 2018 public input: https://twitter.com/t/status/939273644043366400
- Subsequently discussed by the Platform Layout team at Yallhands and by the Layout team at Mozlando2018