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I saw this behavior (with a space between two headers) on some websites so i have implemented that model Sometimes it does make sense - check out this website for example https://www.examtopics.com/exams/ It depends on the content

But anyway both thresholds are customizable. They can be set to one number

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The example you give is neither a space between two headers nor reasonable cause for a sliding-in header; it’s just a wildly incorrect implementation of a sticky header from someone that didn’t know how to do it properly, and probably threw together a couple of inapt jQuery scripts. It should be redone to use `position: sticky`.

CSS sticky would make the effect on that site much smoother IMO as it would just hit the top of the viewport and stick, which is what I tend to see sites like this doing.

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