The winning site: http://web.archive.org/web/20000510060852/http://www.sylloge...
It's difficult to imagine what such an experience would contain, CSS animation trickery?
I'm very pro minimal UI code, my last hobby project didn't include any framework libraries and the front-end came in at 23kb including images, CSS, HTML and JS.
But without a back-end, and without JS (no SPAs), is this just a contest to build the best looking static page?
This is what I learned from the experience: http://openmymind.net/Minimalist-Markup/
Wait, we're talking about bytes?
Smallest view (240px wide) with no JS renders in 6.9kB (DOMContentLoaded hit at 94ms, Load at 119ms). Also in play: client-side caching with ServiceWorker and some localStorage goodies to speed things up on modern browsers.
Although minification & GZip should even those out.
I guess they really mean the old school 'website' (like the html 1.0 strict days), so maybe a html document with everything inline and no special fonts.