sclass JSPanel {
  S headStuff() {
    ret hlink("https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/jspanel.css")
      + hlink("https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/jspanel.js");
  }

ifdef guggida
<!-- optional jsPanel extensions -->
<script src="https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/extensions/modal/jspanel.modal.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/extensions/tooltip/jspanel.tooltip.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/extensions/hint/jspanel.hint.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/extensions/layout/jspanel.layout.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/extensions/contextmenu/jspanel.contextmenu.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jspanel4@4.12.0/dist/extensions/dock/jspanel.dock.js"></script>
endifdef
}