input-placeholder

:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
    color: #f00;  
}
::-moz-placeholder { /* Mozilla Firefox 19+ */
    color: #f00;
}
input:-ms-input-placeholder,
textarea:-ms-input-placeholder {
    color: #f00;
}
input::-webkit-input-placeholder,
textarea::-webkit-input-placeholder {
    color: #f00;
}

תÔØÓÚ:https://www.cnblogs.com/jh2k/p/6216441.html