On Google’s podcast, Martin Splitt explains how default lazy loading can delay LCP, why some libraries hinder indexing, and ...

Lazy-loading The lazy-loading HTML attribute tells a browser to either wait before downloading an image or to download it right away. There is no JavaScript need to accomplish this.

In short, Martin Splitt explained that they are working on new documentation around how Google handles lazy loading scroll events with JavaScript in search.

Traditionally, developers would add lazy loading to a web site through third-party JavaScript libraries, but with the release of Chrome 76, Google has added it as a native feature to the browser.