All anchor element text will have a different shade of blue depending whether the link was visited or not.
所有的定位点元素文本都有一个不同的蓝色阴影，这取决于链接是否访问过。
When a text is blue, the user is used to thing it is a link, and if it is purple, that it is a visited link.
当文本是蓝色的时候，用户认为是链接内容，如果文本为紫色，就是可访问的链接。
Other, less-widely supported pseudo-classes include: first-child, : link, : visited, : active, and: focus and: lang. Note that a pseudo-class can be applied to a specific element type, like this.
还没有得到广泛支持的其他伪类包括：first - child、： link、： visited、： active、： focus和：lang。
应用推荐