CSS Introduction

CSS Introduction （CSS简介）

Cascading Style Sheets (CSS) is a style sheet language used for describing the look and formatting of a document written in a markup language. （级联样式表(CSS)是一种样式表语言，用于描述用标记语言编写的文档的外观和格式。）

CSS was developed by the World Wide Web Consortium (W3C). （CSS由万维网联盟（ W3C ）开发。）

CSS defines how the HTML elements are to be displayed. （CSS定义了HTML元素的显示方式。）

Styles are normally saved in external .css files. External style sheets allow you to change the appearance and layout of all the pages in a Website, just by editing one single file.