How can I add attribute runat="server" in javascript

Question

I want to dynamic create element in js but I cant add runat="server",How can i do

var btn = document.createElement('button');
                    btn.setAttribute('class', 'glyphicon glyphicon-usd btn btn-info text-uppercase');
                    btn.setAttribute('style', 'float:right');
                    btn.setAttribute('onserverclick', 'blessbuttonMaster_Click');
                    btn.setAttribute('id', 'reply_' + data[i].ID);
                    btn.setAttribute("runat","server");