This css-snippet provides background-size functionality for IE8
/**
* Stretch a background-image to fill the parent in IE8.
* Similar to background-size: ...;
*/
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='PATH/TO/IMAGE.png', sizingMethod='scale');
-ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='PATH/TO/IMAGE.png', sizingMethod='scale')";