Earlier quoted context omitted.
Hello, gregablr who works on AMP and forgets to disclose it: No, AMP is not "just HTML". It's not HTML5-compliant. It requires js to run and display properly (because Web Components), it gets preferential treatment in Google Search. It's not plain HTML.
Any AMP page can be HTML5 compliant. AMP doesn't require that the page pass an HTML5 validator, but is entirely compatible with HTML5. JavaScript and Web Components are part of the HTML5 standard. This is simply the Extensible Web ( https://www.w3.org/community/nextweb/2013/06/11/the-extensib... ) My profile discloses that I work on AMP.
They are not compliant by default.
> This is simply the Extensible Web
That gets exclusive preferential treatment by Google.
It's not "just HTML".