Check if element is in viewport

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Fri Apr 23 2021 18:49:47 GMT+0000 (Coordinated Universal Time)

function isInViewport(elem) {
    const bounding = elem.getBoundingClientRect();
    return (
        bounding.top >= 0 &&
        bounding.left >= 0 &&
        bounding.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
        bounding.right <= (window.innerWidth || document.documentElement.clientWidth)
    );
};

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