RE: Only one h1 per page?

Hello Raquel,
 
I know that websites and Publishing at the W3C is different, and in the EPUB  Conformance and Discovery Specification, proper nesting of headings is a requirement. The Accessibility Checker for EPUB, Ace by DAISY presents a data visualization of all headings in the publication, which makes it easy to see the overall structure of the publication.
 
I think the common practice of each chapter starting with a h1 and then proper nesting works well. If the chapter is long and is split over several files, the heading structure is resumed in the next file.
 
Best
George
 
From: Raquel <raquel.moreno.carmena@gmail.com> 
Sent: Saturday, December 8, 2018 8:39 AM
To: w3c-wai-ig@w3.org
Subject: Only one h1 per page?
 
Hi,
Recently, I made a talk about accessibility. I needed to talk about what I'd learnt after making a lot of mistakes, because of a lack of knowledge. I had a lack of empathy, because a lack of information/knowledge..
I read a lot of documentation about accessibility and I found the recommendation about "only one h1 per page" in several resources, but now I realize that W3C doesn't include it explicitly.
Now, I'm worry about it, because I also told it in my talk. I added a disclaimer at the beginning of the talk: I'm not a specialist on accessibility. But I would like to fix my errors if I told something wrong.
I've continued reading about it and I've found several articles (not in WAI). They explain that it's a recommendation for previous versions of HTML, not for HTML5. You don't have to worry about the order of the rest of the headings if you add a <section> or <article>. In other words, you can start by h1 again in an <article>, for example. I wonder if assistive technology is ready for it.
Please, where can I find more information about this issue? Is it a valid recommendation? Does this recommendation make sense with HTML5? 
I'll write a post about my talk very soon, so I can take that opportunity to clarify this issue. I can also fix my shared slides.
Thanks in advance for your time!
Best regards,
Raquel