Firefox中，如果一个表单控件具有required属性，那么当这个控件失效时会自动被Firefox加上一圈粉红色的边框，极其难看，无法实现各 个浏览器统一，尤其是当你将这个控件设置了不显示某些边框线的时候，要去除Firefox给有required属性的表单控件添加的边框，只需要添加一句 CSS代码即可。
添加下列代码以后，具有required属性的input和textarea将不再自动添加粉红色边框（其实是盒子阴影）。
input[required]:invalid, input:focus:invalid, textarea[required]:invalid, textarea:focus:invalid{box-shadow: none;}
或者
input:focus{outline:none;}
input:required:invalid{box-shadow: none;}
为了兼容老版本的Firefox，还可以将-moz-box-shadow:none也添加上去。
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