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Instead of every website needing to build a table of contents, web browsers should be exposing that via the accessibility tree.
Instead of every website needing to have a UI for paging, web browsers should be able to get the OrderedCollection and render the UI or however many pages you want.
Instead of websites having a million JS-riddled form rendering libaries, web browsers should be able to expose form fields however the user likes.
This should work for 2D, TUI, and 3D depending on browser
Browsers not taking the OS style/needs into consideration and deferring entirely to websites is one of their cardinal sins. We've had CSS APIs in the spec with system styles for years and nobody implements them. Why?