Weird boxes saying "This is a tool icon" have started appearing on various pages on en.wikipedia, without discernable patterns. They disappear when making null edits, or even when just purging the page, but I suspect they'll reappear after a while (probably elsewhere, but whatever). Firebug, Google, a bunch of null edits, some friends who found some more examples, and Special:Code lead me here.
Proof that they exist: , (may disappear when examined), (will not disappear).
Could someone explain what that obvious debug code is doing on production servers with hundreds of millions of users?
--81.231.245.214 14:35, 18 May 2012 (UTC)