filter: progid:DXImageTransform.Microsoft .... with IE does not work

Hi,

I would like to use a color gradient in a text box and I've added the following code.

filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#b3b3b3', endColorstr='#f1f1f1') !important;

background:-moz-linear-gradient(bottom,#b3b3b3,#f1f1f1); /* Firefox */

background:-webkit-gradient(linear,left top,left bottom,from(#b3b3b3),to(#f1f1f1)); /* Chrome, Safari */

It works for Firefox, Chrome but not IE 11. Is there something wrong with the coding or is this a "feature" of Design Studio?

Thx