Check out https://nypost.com/ - shifts and redraws constantly, freezes completely needing page killed on a regular basis, consumes high while completely idle, makes iPhone hot if left open on NYPost page (swear their ad network must be mining crypto or something), routine usage crashes iOS browsers. No additional css needed!
Not only the NYPost, I have an old gen1 or gen2 iPad and it can't render many modern pages. The browser crashes when it tries to load the ads on many pages. Still perfect for reading HN though.
Definitely - it’s when their advertising is loading that all the problems manifest, and it’s the advertising that hammers the cpu once it is loaded, on a desktop where I can filter everything out it’s just another site, on iOS where there is no filtering it causes nothing but problems. Do I want to read about local news and probably lose all my tabs when the browser crashes, or avoid the site and keep my tabs another day? Their app has the same issue, I’m sure it’s just a thin wrapper around the iOS web widget (does not even seem to cache or pre-load content), it freezes solid for minutes while loading advertising and pounds the cpu as long as it’s in the foreground.
