Multiple `<h1>` tags on the page

[xfq]

https://github.com/w3c/elreq/blob/gh-pages/index.html

There are multiple <h1> tags on the page, but there should be only one. See https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/Heading_Elements#avoid_using_multiple_h1_elements_on_one_page