User blog comment:Brandon Rhea/Making Ads Better: The Basics/@comment-1187559-20170117143137/@comment-1187559-20170117233329

By pop-ups I mean ones that sort of dim the background while a video plays until you click out of it, or until the video stops.

Edit: In fact, I just loaded up a page on my Steam browser now,and right at the top is an auto-playing video that is playing sound. Annoyingly, prtscn doesn't like working with Steam overlay, so I may have to use my phone or something to show you it.

Edit 2: Here's a screencap from my phone, as you can see at the very top of the screen is a video that's slotted itself in there, and it started playing itself with sound: link earlier, that video was trying to plant itself within the article itself.