Knowledge base v2.13.0 · Community edition · data through 2 October 2026
Thing · Concept
Loading images or content only when they come into view; Google sees it only if it works without scrolling or clicks.
Glossary · Lazy loading
Loading content only when it is needed. Triggered by an Intersection Observer it can work for Google; triggered by scroll events or clicks it does not.
Documented in
To make infinite scroll indexable, Google's lazy-loading guide says to support paginated loading: give each chunk its own persistent, unique URL, link sequentially to those URLs, and update the displayed URL with the History API when a new chunk becomes the main visible element.
Google Search Central · Day 2 · What is Google friendly JavaScript
Slide and stage claims that name it, the ones Google’s documentation does not cover first.
Lazy loading triggered by a scroll event listener, such as window.addEventListener('scroll', loadMoreProducts), never runs for Googlebot because Googlebot does not scroll.
Rebecca Yu · Day 2 · Lightning session D: Rendering and JavaScript
An Intersection Observer fires when the observed element enters the viewport, and the viewport Google renders with is tall, so content lazy-loaded this way can load during rendering.
Rebecca Yu · Day 2 · Lightning session D: Rendering and JavaScript
Lazy loading should be triggered by an Intersection Observer that watches a sentinel element instead of by a scroll event listener.
Rebecca Yu · Day 2 · Lightning session D: Rendering and JavaScript
Audit tabs, accordions and 'load more' lists for content fetched on click or scroll: put tab content in the initial DOM and hide it with CSS, trigger lazy loading with an Intersection Observer, and give long lists paginated URLs linked with <a href>.
Ibrahim Anjro · Day 2 · Lightning session D: Rendering and JavaScript
Treat the 10,000-pixel viewport as a safety margin, not a target: load lazy content when it enters the viewport (Intersection Observer or native lazy loading, never scroll listeners), and give infinite-scroll content paginated URLs linked with <a href> so anything below the first rendered screen stays reachable.
Ibrahim Anjro · Day 2 · What is Google friendly JavaScript
Kit items about Lazy loading: their own words name it, or several of the claims they rest on do.
Lazy-load with native lazy loading or an IntersectionObserver, never with scroll events
Rests on 6 claims, 3 of them naming Lazy loading; its own words name Lazy loading
Also inglossary term Lazy loading
Things named in the same claim, with the number of claims they share.