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alexmccabe/isInViewport.js

Created January 31, 2018 10:03
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isInViewport.js
export default function (element, threshold) {
threshold = threshold || 0;
var elementTop = element.offsetTop;
var elementBottom = elementTop + element.clientHeight;
var viewportTop = window.scrollY;
var viewportBottom = viewportTop + window.innerHeight;
return elementBottom > viewportTop && elementTop < viewportBottom;
},
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