CSS stands for Cascading Style Sheets, which is a style sheet language used for describing the presentation of a document written in a markup language like HTML. CSS is one of the cornerstone technologies of the World Wide Web, alongside HTML and JavaScript. With CSS, designers and web developers can create style sheets that define how different elements, such as headers, paragraphs, and links, appear on a webpage. CSS enables the separation of presentation and content, including layout, colors, and fonts, which enhances content accessibility and provides more flexibility and control in the specification of presentation characteristics. It also allows for multiple pages to share formatting, which reduces complexity and repetition in the structural content. CSS can be applied to any XML document, including plain XML, SVG, and XUL, and it is maintained by the World Wide Web Consortium (W3C). Introduced in December 1996, CSS has evolved through several versions, with CSS3 being the latest standard at the time of my knowledge cutoff in 2023. CSS3 is split into several separate documents called “modules,” each focusing on specific features, and many of these modules are still in the process of being standardized. CSS is fundamental in responsive web design, enabling webpages to adapt to the screen size and resolution of different devices.

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