Which of these are NOT part of AMP:
Inline CSS
Custom fonts
AMP HTML
Analytics
Explanation:
Read more here: https://support.google.com/partners/answer/7336293?hl=en
The following optimizations combined are the reason AMP pages are so fast they appear to load instantly.
To learn more about how AMP works, you can either watch the video featuring AMP engineering lead Malte Ubl or read the information below the video.
Allow only asynchronous scripts
JavaScript is powerful. It can modify just about every aspect of the page, but it can also block DOM construction and delay page rendering (see also Adding interactivity with JavaScript). To keep JavaScript from delaying page rendering, AMP allows only asynchronous JavaScript.
AMP pages can’t include any author-written JavaScript. Instead of using JavaScript, interactive page features are handled in custom AMP elements. The custom AMP elements may have JavaScript under the hood, but they’re carefully designed to make sure they don’t cause performance degradation.
While third-party JS is allowed in iframes, it cannot block rendering. For example, if third-party JS uses the super-bad-for-performance document.write API, it does not block rendering the main page.
