by google • Built in validation system • Protocol relative url's (dont!) Http: {cdn}/c/ Https: {cdn}/c/s/ More on https://developers.google.com/amp/cache/
progressive web apps. • Security for your users, integrity, even when there's no sensitive data. • Required for video and iframes in AMP's More details at https://developers.google.com/web/fundamentals/security/encrypt-in-transit/why-https