Published Reading
MDN Web Docs, HTML reference reads 71 degrees
https://developer.mozilla.org/en-US/docs/Web/HTML
The page states what it is, who published it and what it answers, and a retrieval system can use it without guessing much. What is left is usually a handful of deliberate signals rather than anything broken.
Can a search engine reach this page, index it, and work out what it is a result for?
Can an AI answer engine retrieve this page and lift a usable answer out of it?
Can a machine get this page cleanly, quickly, and on the first try?
Does this page say what it is, who published it, and why it should be believed?
A visibility reading taken on https://developer.mozilla.org/en-US/docs/Web/HTML on 2026-09-18, measured on 37 observable signals. Retake it yourself and compare.
1831 words, an 86 millisecond response, Search Visibility at 83, and Content and Entity Strength at 29 ... the lowest in this entire set.
That combination looks impossible until you consider what a reference page is. It is not dated, it does not name an author in a machine-readable way, and it does not cite outside sources, because it is the outside source. The entity reading is measuring things this page has no reason to do, and it still costs 20 percent of the temperature.