Welp, it's certainly Google's platform for all future design. So if you think about it holistically then yes, it would be HTML5 because it's going to end up being the next generation of web/app design for them; I'd even bet Material Design ends up being the "preferred" way that Google recommends all web apps be developed. You've got grid systems, web components, and more. Definitely a worthwhile link for this group. +1 upvote.