Does this line covers IE 10+?
From the link you provided:
/* Opera 15+, Chrome 25+, IE 10+, Firefox 16+, Safari 6.1+, iOS 7+, Android 4.4+ */
background-image:
linear-gradient(to right, red, #f06d06);

From the code I used:
background: linear-gradient(right, #7c6853 28%, white 0%);