<h1> recommendation doesn't match HTML 5.1 spec

I’m not sure who follows the issues on GitHub, but GitHub user fstorr has raised an—in my opinion—important issue <https://github.com/w3c/aria/issues/127>, he says that, and I quote:

> In 4.2.7 Providing Navigable Structure within Web Pages <http://w3c.github.io/aria/practices/aria-practices.html#kbd_layout>, there are recommendations for multiple <h1> elements in a page, which goes against the warning in the HTML 5.1 Headings And Sections spec <http://www.w3.org/TR/html51/semantics.html#the-h1,-h2,-h3,-h4,-h5,-and-h6-elements%23headings-and-sections>.

I think we should fix this, but I’m unsure how. What are the thoughts of the group?

—Michiel