Real nice! I kept the stuff at the start only because I copied the original page and removed everything I knew was unnecessary.

score 1 · canonical

As of right now, this is the response they serve. It’s 713 bytes (excluding HTTP headers):

$ curl example.com
<!doctype html><html lang=en><head><meta charset=utf-8><link rel=icon href=data:,><meta name=viewport content="width=device-width,initial-scale=1"><title>Example Domain</title><style>html{color-scheme:light dark;background:light-dark(#eee,#222)}body{font:16px/1.6 system-ui,sans-serif;max-width:30em;min-height:100vh;margin:auto;padding:4.75em 2em 20vh;box-sizing:border-box;display:grid;place-content:center;text-align:center}</style></head><body><p>This domain is for use in documentation examples without needing permission. This is not a service, avoid relying on it for testing and monitoring purposes.</p><a href=https://iana.org/help/example-domains>Learn more</a><script src=/s.js></script></body></html>
$ curl -s example.com | wc -c
713

If their primary objective is cutting bandwidth, then I’d suggest something like this (274 bytes after removing unnecessary whitespace):

<!doctype html>
<html lang=en>

<head>
    <meta charset=utf-8>
    <link rel=icon href=data:,>
    <meta name=viewport content="width=device-width,initial-scale=1">
    <title>Example Domain</title>
</head>

<body><a href=https://iana.org/help/example-domains>Understand this page</a></body>

</html>

The link is already part of the page now, and all real users can just click it to understand the page; the information is all there already.

score 1 · canonical