I couldn't find one last night when I saw your reply (of course) but I've been sent to some sites that were AMP. It's instantly obvious because I have a content

I couldn't find one last night when I saw your reply (of course) but I've been sent to some sites that were AMP. It's instantly obvious because I have a content blocker rule to block the AMP JS - so I get a blank white page for 8 seconds (because the AMP mandatory boilerplate specifies this, via CSS). I'll try to find an example and note down the site that it happens on.