Cascading Style Sheets Level 1

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What Does Cascading Style Sheets Level 1 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).

Techopedia Explains Cascading Style Sheets Level 1

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

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Margaret Rouse
Senior Editor
Margaret Rouse
Senior Editor

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.