(function(){ var els = document.querySelectorAll('.cl-fade-up'); if(!els.length) return; var io = new IntersectionObserver(function(entries){ entries.forEach(function(e){ if(e.isIntersecting){ e.target.classList.add('cl-in-view'); io.unobserve(e.target); } }); }, { threshold: 0.15 }); els.forEach(function(el){ io.observe(el); }); })();