Cascading Style Sheets level 3 (CSS3) provide serveral new features and properties to enhance the formatting and look of documents written in different kinds of markup languages like HTML or XML.
层叠样式表第三版 (CSS3) 提供了若干个新功能和属性，以加强不同的标记语言中编写格式和外观文档，比如 HTML 或 XML。