When scrolling, .vote.js-vote-sticky gets to be .is-stuck. But that's laggy because it's triggered by JS! :o
It should have position: sticky. It's unacceptable to use a slower, inferior JS technique when there's a CSS alternative. Could the CSS equivalent be added, and optionally the JS used as a fallback for crappy browsers?
… in addition to that, it seems like the JS solution is bugged when zoomed with "pinching" on Safari and flickers sometimes in other situations.