CSS pseudo placeholder

placeholder.css

::-webkit-input-placeholder { color: black; }
::-moz-placeholder { color: black; }
:-moz-placeholder { color: black; }
:-ms-input-placeholder { color: black; }

:focus::-webkit-input-placeholder { color: transparent; }
:focus::-moz-placeholder { color: transparent; }
:focus:-moz-placeholder { color: transparent; }
:focus:-ms-input-placeholder { color: transparent; }