Style sheet
A style sheet is a set of rules defining the visual presentation of a document, such as typography, colours, spacing and layout, separately from its content
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
On the web, style sheets are written in CSS and usually stored in .css files shared by every page of a site. This separation keeps the look consistent, allows the design to change without touching the content, and lets presentation adapt to different devices or to print.
The term predates the web: in publishing and layout software, a style sheet groups the paragraph and character styles of a publication. It should not be confused with an editorial style guide, which sets writing conventions, although that is sometimes also called a style sheet.
Also known as
stylesheet
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