input::-webkit-input-placeholder, textarea::-webkit-input-placeholder { color: #f00; }
input:-moz-placeholder, textarea:-moz-placeholder { color: #f00; }
input::-moz-placeholder, textarea::-moz-placeholder { color: #f00; }
input:-ms-input-placeholder, textarea:-ms-input-placeholder { color: #f00; }
原文：http://www.cnblogs.com/wln3344/p/4373914.html