User blog comment:Dopp/Technical Update: November 29, 2011/@comment-3235402-20111205135159/@comment-1066636-20111210171511

Well, I'm not interested in blaming anyone - just saying Wikia didn't break it ;-) If you need a script for collapsible tables, I'd recommend taking a look at w:c:dev:ShowHide which is widely used on Wikia.

The reason why the broken collapsible table code affected the polls is simple: The polls use JavaScript (like the collapsible tables) and when a JavaScript error occurs, the browser stops executing all JavaScript on that page. That's why stuff stopped working seemingly randomly; it worked if loaded before the JS error occured and didn't work if it would have been loaded afterwards.

By the way, the custom CSS for polls definitely wasn't causing this issue; CSS can't cause JavaScript errors ;-)