I am testing a highly-customized web application in Internet Explorer 10 on Windows 8, since it is an up and coming release, and will likely be using my application some day
You should instead use this because of the reason in this answer.
/* don't show the x for text inputs */
::-ms-clear {
width : 0;
height: 0;
}
/* don't show the eye for password inputs */
::-ms-reveal {
width : 0;
height: 0;
}