On https://m.wikimediafoundation.org/wiki/L11_1128_Rinfo_short/en/US#/random
Uncaught ReferenceError: jQuery is not defined US:362 (anonymous function) @ US:362
and on https://wikimediafoundation.org/wiki/L11_1128_Rinfo_short/en/US
ReferenceError: jQuery is not defined /wiki/L11_1128_Rinfo_short/en/US:360:6
This page is using raw HTML. Since August 2015 the MediaWiki front-end has its JavaScript loaded fully asynchronous (T107399).
In order to execute JavaScript if the current browser is supported and after the base modules have loaded (jquery.js, mediawiki.js), use RLQ.
(window.RLQ=window.RLQ||[]).push(function(){ // jQuery( .. ), mw.loader ..., mw.html .., etc. });
See the source code of any wiki page for examples. And ResourceLoader::makeLoaderConditionalScript().
Wow, that page is even trying to insert contribution tracking records from foundationwiki! I added a notice to the top of the 2011 template pointing people to Ways to Give. All the pages we care about working should be updated by now.