olemus
failis talletatav laadistik, mis määrab nende dokumentide küljenduse, millele ta kinnistatakse

Wiktionary::
1. (publishing) a document issued by a publisher informing authors how to style their works for publication; a small style guide
2. (web design) a document consisting of markup that describes the layout and presentation to be used when displaying other documents

ISO/IEC 2382:
failis talletatav laadide kogu, mis määrab nende dokumentide küljenduse, millele ta kinnistatakse
= a collection of styles stored in a file that determines the layout of the documents to which it is attached

ülevaateid
https://en.wikipedia.org/wiki/Style_sheet_(desktop_publishing)

https://en.wikipedia.org/wiki/Style_sheet_(web_development)

https://en.wikipedia.org/wiki/CSS