Cascading Style Sheets Level 1 (CSS1)

Definition - What does Cascading Style Sheets Level 1 (CSS1) mean?

Cascading Style Sheets, level 1 (CSS1) is a recommendation prepared by the World Wide Web Consortium (W3C) that defined the first version (level) of CSS.

CSS defines the concept of style where style defines appearance. Each and every tag of HTML can be modified by associating a particular style with it. The concept of style optimizes the performance of HTML content rendering, and simplifies developers' work by uniformly rendering a style specification across different browser implementations. CSS consists of selectors and declarations. The declaration is a combination of property and value.

The CSS1 (sometimes written CSSL1) was initially recommended on December 17, 1996. The current version is CSS, level 2 revision 1 (CSS 2.1).

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Techopedia explains Cascading Style Sheets Level 1 (CSS1)

HTML is the primary markup language involved in Web development. However, HTML does not isolate the structure and content of a document. The structure of the document deals with how the page is displayed on the screen, while the content of the Web page is the actual data encapsulated within the HTML tags. CSS helps to resolve the limitations of HTML by giving a designer more control over the look and feel of a page.

Features supported by CSS:

All font-related properties like size, color, family, etc.
Text color, background color and any modification associated with images
All related attributes of text such as size, letter spacing and alignment
All appearance and formatting associated with tables and frames
All spacing attributes like margin, padding and border, along with spacing in horizontal and vertical directions