​

 <div apply="pkg$.IconComposer" id="target">

   <button id="myButton"/>

   <n:i ca:data-feather="circle" />

 </div>

  <script>

    //load js any file asynchronously with callback

    function async(u, c) {

      var d = document, t = 'script',

          o = d.createElement(t),

          s = d.getElementsByTagName(t)[0];

      o.src = '//' + u;

      if (c) { o.addEventListener('load', function (e) { c(null, e); }, false); }

      s.parentNode.insertBefore(o, s);

    }

    zk.afterLoad(function(){//afterload start

    async('unpkg.com/feather-icons/dist/feather.min.js', function() {

         feather.replace();

    });

    }); //afterload end

  </script>

</zk>