How to Detect When a Sticky Element Gets Pinned

Totally agree with David, on CSS needing a selector to know if a position: sticky; element is doing its sticky thing or not.

Ideally there would be a :stuck CSS directive we could use, but instead the best we can do is applying a CSS class when the element becomes sticky using a CSS trick and some JavaScript magic

I love it when there is a solution that isn’t some massive polyfill or something. In this case, a few lines of IntersectionObserver JavaScript and tricky usage of top: -1px in the CSS.

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