I just realised:
Rubenerd started using Let’s Encrypt SSL certs, mostly because this site is one long, over-engineered experiment.
All HTTP requests are redirected to HTTPS
My cipher suite doesn’t include support for Internet Explorer 6
Therefore, Internet Explorer 6 users can’t get here. Which means no more IE6 CSS hacks!
I kept the IE6 hacks around because I knew them off by heart, and my design is simple enough that it wasn’t much effort to include anyway. This finally gives me the impetus to remove these entirely.