JSFiddle - React, Tailwind, and code Playground

JavaScript

(function() {
    var printed = 0;
    // FF and IE
    var onbeforePrinting = function() {
      // It may happen that the browser supports either onbeforeprint and 
      // matchMedia, let's avoid duplicated pushes to the dataLayer
      for(i in google_tag_manager) 
        if(i.match(/^GTM/))  
         if(google_tag_manager[i].dataLayer.get('event')!="onBeforePrint")
         {
             if(printed == 0)
             {
               dataLayer.push({'event':'onBeforePrint','currentURL': location.pathname});
               printed = 1;
             }
         }         
    };

    // matchMedia Support
    if (window.matchMedia) {
        var mediaQueryList = window.matchMedia('print');
        mediaQueryList.addListener(function(mql) {
            if (mql.matches) 
                onbeforePrinting();
        });
    }
    window.onbeforeprint = onbeforePrinting;
}());