[lukev]

Counterpoint: the standardized surface area of a browser is already enormous, and while these components seem simple, there are a billion different options, variables or alternative implementations to consider.

At some point, functionality needs to exist in user space, even if it's common.

[YmiYugy]

Yes, please! But browsers need to make it easier for things to exist in user space. That means reviving CSS Houdini, particularly reviving the animation and layout worklets. (It got abandoned because browser vendors (Chrome in particular) found them too difficult to implement. They would need to rearchitect a good chunk of their rendering pipeline. Instead we got a bunch of very limited but easier to implement features like scroll animation timelines)