I swore I saw a <section> tag. Sorry, had to play devil's advocate. I think people generally just group HTML5 and CSS3 together. I would say that perhaps Adobe

I swore I saw a <section> tag. Sorry, had to play devil's advocate. I think people generally just group HTML5 and CSS3 together. I would say that perhaps Adobe is doing that as well, but it's equally plausible that it (Edge) promotes the use of HTML5 specific elements and markup?