SCRIPT5022: Exception thrown and not caught
jquery.js, line 85 character 139
Not a lot of help.
After further research I found that there is actually a problem with how jQuery is handling this and I had to rewrite it.
jQuery.expr[':'].focus = function( elem ) {
return elem === document.activeElement && ( elem.type || elem.href );
};
Quoted from Mathias Bynens here:
Note that the (elem.type || elem.href) test was added to filter out false positives like body. This way, we make sure to filter out all elements except form controls and hyperlinks.