The old-style popup windows have a specific API window.open() that can be blocked. What the author calls popups are mostly just HTML <div> elements, perhaps using CSS properties such as position and/or z-index, so there's no generic way to block them. It's extremely difficult to block the "bad" ones while allowing the "good" ones. If this were a problem that could be solved generically, then browser extensions would have solved it long ago. Instead, the browser extensions are forced to keep extremely long lists of mostly site-specific elements to block. I'm not sure how the web browser vendors themselves could it it any differently, without completely redesigning HTML.
Anyway, forbidding pages from loading secondary content would break millions of sites, including the most visited sites in the world. That would be equivalent to completely redesigning HTML/JS.
"Only allow play of audio in response to user action."
Okay, cool, so there's a giant 'click' event handler on top of the whole page. When you click it I'm going to play a 250ms long sample of silence embedded as a data:// URL into the audio or video element.
Now I control the player and can do whatever I want.
