常用伪类选择器
| IE7 | IE8 | IE9 | |
| :hover | √ | √ | √ |
| :focus | × | √ | √ |
| :first-child | √ | √ | √ |
| :last-child | × | × | √ |
| :first-of-type | × | × | √ |
| :last-of-type | × | × | √ |
| :nth-child(n) | × | × | √ |
| :nth-last-child(n) | × | × | √ |
| :nth-of-type(n) | × | × | √ |
| :nth-last-of-type(n) | × | × | √ |
| :enabled | × | × | √ |
| :disabled | × | × | √ |
| :checked | × | × | √ |
1. 超链接图片有蓝框
border:none;
原文：https://www.cnblogs.com/71yishen/p/12172528.html