Interestingly (if you're a massive web nerd) is that the image asset request sets a no-cache header. Almost certainly just a default setting that's been overlooked but it could be a tracking image in disguise! :)
I didn't know about the downvote arrow. Makes me sad to see that even if my Hacker News account is almost 7 year old, I only got 312 karma points. :-(
That way you technically always have the same HTML though the user can't see the arrow or use it.
Fear of accidental downvoting prevents some people from upvoting. That's sub optimal.
P.S. It has unicode arrows.
Wonderful unicode arrows!
Granted, on a site as simple as HN this makes no difference at all. But I think there is an overall trend to push more work onto the client, which kinda makes sense since they have more and more CPU and RAM over time. OTOH, its bad because I can throw away my old "office" desktop and my "netbook" (it has net in the name!) because they can't browse the average webpage anymore!
Terminals have supported unicode (at least partially) for a while. Also, arrows have been available in the charset since DOS times.
Perhaps they're still on RHEL5. Many of us are.