Join MDN and developers like you at Mozilla's View Source conference, 12-14 September in Berlin, Germany. Learn more at https://viewsourceconf.org

CSS developer guide

Draft
This page is not complete.

Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in HTML or other markup languages such as SVG. CSS describes how the structured elements in the document are to be rendered on screen, on paper, in speech, or on other media. The ability to adjust the document's presentation depending on the output medium is a key feature of CSS.

CSS is one of the core languages of the open Web and has a standardized W3C specification.

Writing efficient CSS
This document provides guidelines for optimizing CSS code, and more specifically on how to write efficient selectors.

Pages elsewhere

Here are other pages related to CSS that should be linked to from here.

See also

Document Tags and Contributors

 Contributors to this page: Sheppy
 Last updated by: Sheppy,