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What is CSS?

Published on November 20, 2020 · Updated on November 20, 2020
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By Erin Glass
Senior Manager, DevEd
What is CSS?

Cascading Style Sheets (CSS) is a stylesheet language used to control the presentation of websites.

CSS was first introduced by Håkon Wium Lie in 1994 while working at the European Organization for Nuclear Research (CERN) alongside Tim Berners-Lee, the inventor of the World Wide Web. At the time, webpages were typically created exclusively with HTML, the Hypertext Markup Language that Berners-Lee had developed in the 1990s.

However, HTML had been developed to describe the semantics of a web document’s components (such as its headings and paragraphs) rather than provide style instructions. As the growing use of HTML to style webpages became increasingly unwieldy, CSS was introduced to provide a more efficient method for styling websites in conjunction with HTML. Today, along with HTML and JavaScript, CSS is one of the core technologies supporting the World Wide Web.

For more educational resources related to CSS, please visit:

A complete list of educational resources related to CSS is available on our CSS page.

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About the authors
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Senior Manager, DevEd

Open source advocate and lover of education, culture, and community.

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