placeholder属性定义

input::-webkit-input-placeholder,
textarea::-webkit-input-placeholder {
    color: #999;
}

input:-moz-placeholder,
textarea:-moz-placeholder {
    color: #999;
}

input::-moz-placeholder,
textarea::-moz-placeholder {
    color: #999;
}

input:-ms-input-placeholder,
textarea:-ms-input-placeholder {
    color: #999;
}

转载于:https://www.cnblogs.com/luoshang/p/7285591.html