Check if an element is in the viewport

The following functions return true if the ele element is visible in the viewport:

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

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