HTML/CSS: Grayscale

CSS

.Grayscale
{
    /* Not supported by IE 10, but older versions of IE work */
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'saturate\' values=\'0\'/></filter></svg>#grayscale");
    filter: gray;
    -webkit-filter: grayscale(100%);
}