Computer files that define the visual formatting and presentation of web pages or documents.
Compound of 'style' from Latin stilus 'writing tool' + 'sheets' from Old English scete. The term emerged in the 1990s with the development of CSS (Cascading Style Sheets) for web design.
Stylesheets revolutionized web design by separating content from presentation - like having a master decorator who can instantly redecorate every room in a mansion by changing one set of instructions. This separation made websites more maintainable and accessible.
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