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Cascading Style Sheets (CSS) is a style sheet language used to define the presentation and styling of web documents written in markup languages such as HTML or XML (including SVG and MathML). As a cornerstone of the Web alongside HTML and JavaScript, CSS enables authors to separate content from presentation—covering layout, colors, fonts, and other visual (and some non-visual) formatting—so the same underlying markup can be styled in different ways for different contexts like screen, print, or assistive technologies. CSS works by applying style rules to elements in the document using selectors, which match tags and attributes. Rules are organized into style sheets and include declaration blocks that specify properties and values. The “cascading” aspect determines which declaration takes effect when multiple rules match an element, using a predictable priority scheme. CSS also supports reuse and efficiency by allowing multiple pages to share the same external .css file, which can be cached to improve load speed.
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