Google just released a new document focused on helping webmasters and SEOs ensure a lazy-loading web page content can still be crawled, indexed and eventually ranked in the Google search results. You can find this helpful new support page in the Google developer guides HERE.
What is Lazy Loading?
Lazy loading is technique that defers loading of non-critical resources at page load time. Instead, these non-critical resources are loaded at the moment of need. Where images are concerned, “non-critical” is often synonymous with “off-screen”.
Why is this important?
Deferring loading of non-critical or non-visible content, also commonly known as “lazy loading”, is a common performance and UX best practice. For more information, see the Web Fundamentals guide for lazy loading images and video. However, if not implemented correctly, this technique can inadvertently hide content from Google. This document explains how to make sure Google can crawl and index lazy-loaded content.