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What is CSS? An Introduction to Cascading Style Sheets

Article Summary

CSS (Cascading Style Sheets) is a style sheet language that tells browsers how to display colors, fonts, layouts, and visual styling on a webpage. This article covers how CSS works with HTML, the three types of CSS, and how JavaScript fits in. Readers will gain a clear, practical foundation in what CSS is and how it powers web design.

CSS (cascading style sheets) is a style sheet language. It is similar to a programming language, except instead of telling a computer what to do, it tells a web browser how to display elements on a website. We use CSS to manipulate the styles of elements on a webpage.  Make this button purple and give it rounded corners.  Make the navbar twice as thick and give it a black background color.

HTML: You cannot use CSS without a markup language

Because CSS only describes style, you cannot “see” CSS on its own, without attaching it to a corresponding markup language.

CSS can be used with HTML, XHML, XML, and other XML-based markup languages. HTML is by far the most commonly used. Markup languages use plain text, images, video, and other media, and tag them as distinct content elements — a title, a paragraph, a list, etc. From here on in, we’ll use HTML instead of the term markup language, but remember that other markup languages exist. 

In the wonderful world of grammar, adjectives like fluffy, shiny, tiny, bumpy, etc. are meaningless on their own. They need to be paired with a noun that they describe: the fluffy lamb, a tiny marmoset, etc.  The relationship between HTML and CSS is similar. 

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What is the key takeaway of "What is CSS? An Introduction to Cascading Style Sheets"?

If you want to learn web development, then you need to know cascading style sheets (CSS) — the language that powers the presentation of what you see on the web. This guide provides structured insights, proven methodologies, and actionable execution steps for modern professionals.

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