Code that you insert on this page could contain malicious content capable of compromising your account. If you import a script from another page with "importScript" or "iusc", take note that this causes you to dynamically load a remote script, which could be changed by others. If you are unsure whether code you are adding to this page is safe, you can ask at the appropriate village pump. The code will be executed when previewing this page.
This script seems to have a documentation page at User:Lupin/popups.
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varpopScript='//en.wikipedia.org/w/index.php?action=raw&ctype=text/javascript&title=MediaWiki:Gadget-popups.js';varpopStyleSheet='//en.wikipedia.org/w/index.php?action=raw&ctype=text/css&title=MediaWiki:Gadget-navpop.css';if(window.localCSS){popStyleSheet='http://localhost:8080/js/navpop.css';}functionpopups_importScriptURI(url){vars=document.createElement('script');s.setAttribute('src',url);s.setAttribute('type','text/javascript');document.getElementsByTagName('head')[0].appendChild(s);returns;}functionpopups_importStylesheetURI(url){returndocument.createStyleSheet?document.createStyleSheet(url):popups_appendCSS('@import "'+url+'";');}functionpopups_appendCSS(text){vars=document.createElement('style');s.type='text/css';s.rel='stylesheet';if(s.styleSheet)s.styleSheet.cssText=text//IEelses.appendChild(document.createTextNode(text+''))//Safari sometimes borks on nulldocument.getElementsByTagName('head')[0].appendChild(s);returns;}popups_importStylesheetURI(popStyleSheet);popups_importScriptURI(popScript);if(typeofmw!=='undefined'){mw.loader.using(['mediawiki.storage','mediawiki.notify'],function(){vark='User:Lupin/popups.js',t='Information: You are importing User:Lupin/popups.js'+' into your common.js or <skin>.js!\n'+'This script is unmaintained. Please remove this inclusion and enable the Navigation popups Gadget in the preferences of your account instead.',x=mw.storage.get(k);if(!x){mw.storage.set(k,1);alert(t);}else{x++;mw.storage.set(k,x);if(x%25===0){mw.notify(t);}}});}