@react-hook/window-scroll

A React hook for updating components when the scroll position of the window on the y-axis changes
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reactreact hookhookreact hookshookswindow scrollwindow scroll hookscroll positionviewportviewport scrollviewport scroll hookusewindowscrolluse window scrollreact window scroll hookreact scroll position hookusescrollpositionuse scroll positionscroll position hook

react-scroll-percentage

Monitor the scroll percentage of a component inside the viewport, using the IntersectionObserver API.
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reactcomponentviewportintersectionscrollinview

jquery-visible

Quickly check if an element is within the browsers visible viewport, regardless of scroll position. If a user can see this element, the function will return true.
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visibleviewportvisibilityviewscrolldisplayuihelperelementhiddenhide

astro-scroll-observer

Viewport scroll position and direction watcher. Binds states data attributes to `HTML` for further JS/CSS usage. Scroll event is throttled for performance economy.
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astroastro-componentscrollobserverhtmlviewportcsstogglescrollingpositiondocumentwatchwindow

scrollprogress

Light weight library to observe the viewport scroll position
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scrollprogressviewportobserverui