> Your screen is 1512 by 982 pixels, rendered at 2x density — which means it is almost certainly a recent, high-end display. Your device volunteered all of this in the first milliseconds of the connection.

No it didn't. It was queried by the JS running on the page. It's a fun demo but it could really do without the slop prose.

Pedantic but right. The JS queries them; the browser returns them without prompting the user. "Volunteered" is the editorial verb for that round-trip but it does paper over a layer.