Chrome Intersection Observer: Decision Guide for Viewport Loading
Replace window.onscroll with Intersection Observer in Chrome to reduce main-thread load and trigger lazy loading before elements enter the viewport.
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Stop Scrolling the Main Thread: Using Intersection Observer in Chrome for Lazy Loading
Scroll listeners that call getBoundingClientRect() thrash layout. Chrome's Intersection Observer API fixes lazy loading and infinite scroll with asynchronous, reflow-free visibility callbacks.
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