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Find out which element is scrolling
Find out which element is scrolling 1javascript:!function() { var slice = Array.prototype.slice; function throttle(type, name, obj) { obj = obj || window; var running = false; var func = function() { if (running) { return; } running = true; requestAnimationFrame(function() { obj.dispatchEvent(new CustomEvent(name)); running = false; }); }; obj.addEventListener(type, func); } slice .call(document.querySelectorAll("*")) .filter( e => e.scrollWidth > e.offsetWidth || e.scrollHeight > e.offsetHeight ) .filter(e => { var style = window.getComputedStyle(e); return [style.overflow, style.overflowX, style.overflowY].some( e => e === "auto" || e === "scroll" ); }) .forEach(e => { var color = Math.floor(Math.random() * 16777215).toString(16); e.style.backgroundColor = "#" + color; throttle("scroll", "optimizedScroll", e); e.addEventListener("scroll", event => { console.log("%c[scroll]", "color: white; background-color:#" + color, event.target); }); }); }()
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