Download the example or clone the repo:
curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/with-amp
cd with-amp
Install it and run:
npm install
npm run dev
Deploy it to the cloud with now (download)
now
Next.js allows the construction of custom Documents. This feature enable the usage of custom attributes and elements. In this case, AMP tags and attributes.