This one: https://html.spec.whatwg.org/multipage/ . Contrary to some people's perception here, everything that goes into this is implemented by at least 2 browsers.
Sorry, but you can't print that page and use that forever. I understand that you wish that you could, but you can't. I live in the real world, so rather than reading a snapshot and hoping it stays that way forever, I just read the up-to-date version since that's what is implemented by browsers, not the PDF I saved 3 months ago.
Given that the browsers with respect to which you implement the code change under your feet every 6 weeks, I think it's better the standard keeps pace with them than having it give a misleading impression of what you're developing against.
I hope we can agree HTML is used for text content first and foremost. A format that changes all the time at the whim of an ad company is basically useless for long-term preservation of legal documents, or documents in education, etc. Do you think having the latest web app fad is more important? Especially when the format has been around for 25 years now. "Innovation" on the Web is only happening so that Google can keep an edge in search tech, and for similar reasons.
