<!--[if IE]>
@font-face {
    font-family: 'Rockwell';
    src:    url('rock.eot');
    src:    url('rock.eot?#iefix')   format('embedded-opentype');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'Rockwell';
    src:    url('rock.woff');
    src:    url('rock.woff')         format('woff'),
            url('rock.woff2')        format('woff2'),
            url('rock.svg#Rockwell') format('svg'),
            url('rock.ttf')          format('truetype');
    font-weight: normal;
    font-style: normal;
}
<![endif]-->