I raise you one. Death to the parallax scroll. In fact, death to all scroll animations.

Scrolling should just move a fixed size view up and down a fixed sized page. Why on earth must everyone complicate it so much?

I don't understand why browsers ever let designers fuck up the scrolling mechanism in the first place. Why is that even possible?

Browsers have handed way too much control to web developers. "The web as a software SDK" was a terrible idea.

My biggest annoyance: letting scripts control the history. I can imagine that someone thought "oh it'll be nice, you can use it for pages of an app". But the reality is that people are not nice and it gets used maliciously all the damn time. It should not be allowed.

The web should be a method of delivering documents exclusively, and be limited to the kinds of things you can do with other computerized documents (the basics, but also Audio, Video, Animations, hyperlinking, etc.)

I'd be okay with locking these heavily-abused features behind a "web app mode" that the user has to enable on a per-site basis. It should include a restriction forcing all content to come from the same origin, so that the browser in that mode won't make it easy for web apps to include third-party tracking or advertising.

Death to scroll event override in general. Messes up my vimium smooth scrolling.

Absolutely.

I'm not against animations in UI design but these should be used purposefully to direct the user's attention on something or for minimal aesthetic effect. When everything is moving it's just like adding a ton of ketchup to everything.