Does CSS have different versions like HTML

Answer 1

CSS doesn't have versions but levels. Each level builds on the previous, refining definitions and adding new features. Now, it's 'CSS Level 3'.
From this level on, modules are levelled independently. For example, there's a working draft (work in progress) of 'CSS Pseudo-Elements Module Level 4' that may become a recommendation (standard) before other Level 3 modules.

Answer 2

yap

Answer 3

当然有啦