# StateThe Intersection Observer API provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or with a top-level document's viewport.
The useIntersectionObserver function exposes the following reactive state:
Boolean If the element or a part of it is in the view port. isFullyInView Boolean If the element is fully contained within the viewport. intersectionRatio Number A number between 0 and 1 representing how much of the element is in the viewport. # Methods
The useIntersectionObserver function exposes the following methods to give you fine control over the observation state:
observe(void) Starts/Resumes observing the element. unobserve(void) Stops/Pauses observing the element. # Config
useIntersectionObserver function takes a required parameter that is a ref to the observed element and optional config .
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