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Stylesheet - MDN Web Docs Glossary: Definitions of Web-related terms 编辑

A stylesheet is a set of CSS rules used to control the layout and design of a webpage or document. Internal stylesheets are placed inside a <style> element inside the <head> of a web document, and external stylesheets are placed inside a separate .css file, which is applied to a document by referencing the file inside a <link> element in the document's head.

External stylesheets are generally preferred because they allow you to control the styling of multiple pages from a single place, rather than having to repeat the CSS across each page.