CSS @container scroll-state: Replace JS scroll listeners now

**CSS @container scroll-state: Replace JS scroll listeners now**

Scroll containers have always been a weak spot in CSS. For years, if you wanted a navigation bar to restyle itself once it became sticky, or a photo to react when it entered the viewport, JavaScript was the only real option. Most of us have written the same pattern: add a scroll listener, call getBoundingClientRect() a few times, flip some classes, and hope the main thread keeps up. It’s a lot of machinery for something that should be simple. And when it slips, you get jank – those subtle but frustrating moments where the UI lags behind your scroll...

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