static S hplaceholderColor(S color) {
  ret hcss([[
::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  color: COLOR;
}
::-moz-placeholder { /* Firefox 19+ */
  color: COLOR;
}
:-ms-input-placeholder { /* IE 10+ */
  color: COLOR;
}
:-moz-placeholder { /* Firefox 18- */
  color: COLOR;
}]].replace("COLOR", color));
}