/* Chrome/Safari/Opera */
input::-webkit-input-placeholder,
textarea::-webkit-input-placeholder{color:#999;}
/* Firefox 19+ */
input::-moz-placeholder,
textarea::-moz-placeholder{color:#999;opacity:1;}
/* IE 10+ 注意这里只有一个冒号 */
input:-ms-input-placeholder,
textarea:-ms-input-placeholder{color:#999;}
.placeholder{color:#999;}
//焦点
input:focus::-webkit-input-placeholder,
textarea:focus::-webkit-input-placeholder{color:transparent;}
input:focus::-moz-placeholder,
textarea:focus::-moz-placeholder{color:transparent;}
原文链接 http://www.cnblogs.com/xyzhanjiang/p/4551243.html
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