This site more or less practices what it preaches. `newsbanner.webp` is 87.1KB (downloaded and saved; the Network tab in Firefox may report a few times that and I don't know why); the total image size is less than a meg and then there's just 65.6KB of HTML and 15.5 of CSS.

And it works without JavaScript... but there does appear to be some tracking stuff. A deferred call out to Cloudflare, a hit counter I think? and some inline stuff at the bottom that defers some local CDN thing the old-fashioned way. Noscript catches all of this and I didn't feel like allowing it in order to weigh it.