CSS（cascading style sheets），有譯階層式樣式表，係用嚟幫結構化文件（好似 HTML、XML）加式樣（好似字型、間距同色水）嘅電腦語言，由 W3C 定義同維護。CSS 響1996年推出，而家廣泛應用嘅係第三代，即係 CSS3。
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