Hacker News actually only has one bit of javascript on it, which sends the request when you click the "upvote" button (and does so with `new Image(endpoint)`, n

Hacker News actually only has one bit of javascript on it, which sends the request when you click the "upvote" button (and does so with `new Image(endpoint)`, not XHR). If you view the source of this page, it's at line 3.