fix: added comment for explaining the working of VWO SmartCode v2.1

integrations/visual-website-optimizer/lib/index.js

@@ -52,6 +52,7 @@ VWO.prototype.initialize = function() {
       version=2.1,
       settings_tolerance=this.options.settingsTolerance,
       hide_element='body',
+      /* The VWO SmartCode v2.1 script when it gets executed auto-detects (detecting first-contentful-paint Ref: [PerformancePaintTiming - Web APIs | MDN](https://developer.mozilla.org/en-US/docs/Web/API/PerformancePaintTiming)) if the page is already loaded then it prevents the page (body) from hiding from it. */
       hide_element_style = 'opacity:0 !important;filter:alpha(opacity=0) !important;background:none !important;transition:none !important;',
       /* DO NOT EDIT BELOW THIS LINE */
       f=false,w=window,d=document,v=d.querySelector('#vwoCode'),cK='_vwo_'+account_id+'_settings',cc={};try{var c=JSON.parse(localStorage.getItem('_vwo_'+account_id+'_config'));cc=c&&typeof c==='object'?c:{}}catch(e){}var stT=cc.stT==='session'?w.sessionStorage:w.localStorage;code={nonce:v&&v.nonce,use_existing_jquery:function(){return typeof use_existing_jquery!=='undefined'?use_existing_jquery:undefined},library_tolerance:function(){return typeof library_tolerance!=='undefined'?library_tolerance:undefined},settings_tolerance:function(){return cc.sT||settings_tolerance},hide_element_style:function(){return'{'+(cc.hES||hide_element_style)+'}'},hide_element:function(){if(performance.getEntriesByName('first-contentful-paint')[0]){return''}return typeof cc.hE==='string'?cc.hE:hide_element},getVersion:function(){return version},finish:function(e){if(!f){f=true;var t=d.getElementById('_vis_opt_path_hides');if(t)t.parentNode.removeChild(t);if(e)(new Image).src='https://dev.visualwebsiteoptimizer.com/ee.gif?a='+account_id+e}},finished:function(){return f},addScript:function(e){var t=d.createElement('script');t.type='text/javascript';if(e.src){t.src=e.src}else{t.text=e.text}v&&t.setAttribute('nonce',v.nonce);d.getElementsByTagName('head')[0].appendChild(t)},load:function(e,t){var n=this.getSettings(),i=d.createElement('script'),r=this;t=t||{};if(n){i.textContent=n;d.getElementsByTagName('head')[0].appendChild(i);if(!w.VWO||VWO.caE){stT.removeItem(cK);r.load(e)}}else{var o=new XMLHttpRequest;o.open('GET',e,true);o.withCredentials=!t.dSC;o.responseType=t.responseType||'text';o.onload=function(){if(t.onloadCb){return t.onloadCb(o,e)}if(o.status===200||o.status===304){_vwo_code.addScript({text:o.responseText})}else{_vwo_code.finish('&e=loading_failure:'+e)}};o.onerror=function(){if(t.onerrorCb){return t.onerrorCb(e)}_vwo_code.finish('&e=loading_failure:'+e)};o.send()}},getSettings:function(){try{var e=stT.getItem(cK);if(!e){return}e=JSON.parse(e);if(Date.now()>e.e){stT.removeItem(cK);return}return e.s}catch(e){return}},init:function(){if(d.URL.indexOf('__vwo_disable__')>-1)return;var e=this.settings_tolerance();w._vwo_settings_timer=setTimeout(function(){_vwo_code.finish();stT.removeItem(cK)},e);var t;if(this.hide_element()!=='body'){t=d.createElement('style');var n=this.hide_element(),i=n?n+this.hide_element_style():'',r=d.getElementsByTagName('head')[0];t.setAttribute('id','_vis_opt_path_hides');v&&t.setAttribute('nonce',v.nonce);t.setAttribute('type','text/css');if(t.styleSheet)t.styleSheet.cssText=i;else t.appendChild(d.createTextNode(i));r.appendChild(t)}else{t=d.getElementsByTagName('head')[0];var i=d.createElement('div');i.style.cssText='z-index: 2147483647 !important;position: fixed !important;left: 0 !important;top: 0 !important;width: 100% !important;height: 100% !important;background: white !important;display: block !important;';i.setAttribute('id','_vis_opt_path_hides');i.classList.add('_vis_hide_layer');t.parentNode.insertBefore(i,t.nextSibling)}var o=window._vis_opt_url||d.URL,s='https://dev.visualwebsiteoptimizer.com/j.php?a='+account_id+'&u='+encodeURIComponent(o)+'&vn='+version;if(w.location.search.indexOf('_vwo_xhr')!==-1){this.addScript({src:s})}else{this.load(s+'&x=true')}}};w._vwo_code=code;code.init();})();