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Created January 21, 2020 16:41
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let options = {
root: document.querySelector("#scrollArea"), // null
rootMargin: "0px 0px 0px 0px",
threshold: 1.0 // [0, 0.25, 0.50, 0.75, 1]
let observer = new IntersectionObserver(callback, options);
let target = document.querySelector("#listItem");
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