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CSS (Cascading Style Sheets) is a style sheet language used to specify the presentation and styling of web documents written in markup languages such as HTML or XML (including SVG and MathML). It is a cornerstone of the Web alongside HTML and JavaScript, and it enables authors to separate content from presentation—covering layout, colors, fonts, and other visual (and some non-visual) formatting details. CSS improves accessibility and maintainability by allowing content to be written without embedding presentation details, while styling can be reused across multiple pages via shared external .css files. This also supports consistent site-wide formatting, reduces repetition in HTML, and can improve performance because shared CSS files are cacheable. The “cascading” behavior determines which styles apply when multiple rules match an element, using a predictable priority scheme. CSS is standardized and maintained by the W3C, and it can be applied not only for screen display but also for alternative rendering methods such as print and voice-based or tactile devices.
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