This demo illustrates event handling using the
       Tau-Prolog compatible
       library(dom).  We show two versions, one using
       exclusively the Tau-Prolog module and one using SWI-Prolog's
       general calling to JavaScript.
    
If you click the buttons, the label of the clicked button is changed.
This version uses Tau-Prolog library(dom) library to manipulate the DOM and bind the event handling.
    
    
    
      This versions uses SWI-Prolog's general JavaScript interface for
      manipulating the DOM.  Note that bind/4 is part of
      the low level library(wasm).  In
      addition, library(wasm)
      provides bind_async/4 which makes the event-handler
      create a new asynchronous task.