Reliable way to get line-height of the particular html element with JQuery

get line-height of the HTML element

 function dirty_lineheight_px(obj) {
            $(obj).append("<div id='dirty_lineheight_px' style='position:absolute; visibility:hidden'>S</div>");
            // measure
            var temp_height = $('#dirty_lineheight_px').height();
            // cut
            $('#dirty_lineheight_px').remove();
            return temp_height;
        }