[ CSS 中文开发手册:first-of-type (Selectors) - CSS 中文开发手册该:first-of-typeCSS伪类表示其同类型的一组同胞元素中的第一个元素。/* Selects the first <p> to appear inside a parent element regardless of its position inside the si
One of the most important features of style sheets is that they specify how a document is to be presented on different media: on the screen, on paper, with a speech synthesizer, with a braille device(盲人使用的设备上), etc.style sheet设置的目的，是为了描述文档如何在不同的media类型上.
