Dynamics

[JerryI]

Make a dynamic page like

<p>Live Factorial</p>
<?wsp Dynamic[ ?>
  <div style="color: red"><?wsp x! ?></div>
<?wsp , TrackedSymbols:>{x}] ?>

Use WS to send an updated result

[JerryI]

Dynamic[expr_String, OptionPattern[]] := Module[{uid = CreateUUID[]},
  (* add handlers, bind events*)

  Return["<div id=\""<>uid<>"\">"<>LoadPage[expr]<>"</div>"];
]

[JerryI]

Added as a part of WLJS.