Google announced that they added some features, including the sidebar menu, social sharing embedded, dynamic CSS class, and accordion amp. Yes, the accordion.
Here is how they work:
Google writes:
Publishers need to make the most space for the mobile device, everyone, but this does not mean having to give up good content. Even on the desktop, using a folding is a popular way, you can choose to display the detailed information for the next higher level heading. This solution to the AMP with a freely styleable component, you can expand and fold part by tapping on the head.
But you ask, no Google tell us time and time again in the hide tabs or accordion content, not to Google, Google may ignore it?
Well, maybe not here? I asked John on Twitter · Mueller about it, but he has yet to reply.
Of course, this may change how Google the content of communications. On the move in the first world, with tabs, accordions, and another content is obviously sensible. Well, the new mean, Google said so above.
Twitter Forum discussion.