The spec talks about "moving, blinking or scrolling information that (1) starts automatically, (2) lasts more than five seconds, and (3) is presented in parallel with other content"
It's relatively uncommon to encouter this as part of an app or actual legitimate content, but most sites that have ads would violate this spec. And I've noticed that I found those moving elements distracting enough that I just furiously closed a site and gave up on pursuing the information on it when I had the misfortune of encountering a news site on a PC without an ad blocker.
