Not sure how those got in there and git-blame is not helpful. Maybe just me typing out as many as I could imagine? :v

No h1 because there is only ever one of those and it's at the top of the first page.

Thanks :-)

While they're not valid, I believe the browser will still respect non standard headings. The browser will treat them like non semantic elements (similar to a div), but you can kind of make it legit with a couple different aria attributes. I would recommend staying within the standard heading sizes though.