Looks like Mattia Rizzolo is responsible. Only available on Xenial and Yakkety, but good news nonetheless!
Might have to make a suggestion on his description, though. He's still crediting HTML Tidy for the auto-formatting/code correction instead of Gumbo.
Still ... I'm excited to see it! Thanks for letting us know.
Xenial's the latest LTS version, btw. Just released last week, I think. Yakkety will be 16.10