The included YUI 3 library loads files from external yui server, when eZJSCore packer is enabled.
ezjscore.ini.append.php
[eZJSCore] Packer=enabled LoadFromCDN=disabled
Redhat Linux PHP 5.3.2 MySQL 5.1.53 Any Browser
EZP-17877 ezjscore loads external yui2 js on yahoo CDN (but CDN is disabled in .ini)
EZP-18454 find-as-you-type always loads yui code from cdn
EZP-18499 Asynchronous publishing backoffice interface - JS error : Y.io is undefined on /content/queued/xxxxx/x