Lazy loading is not a new concept by far. The idea is simple – defer loading some of the heavier elements of a page until the lighter ones are loaded. That way, the user can start interacting with the content sooner rather than later.
Since 2019, Chrome and Chromium-based browsers have had lazy loading for images and iframes. Both types of elements will only start loading once the user scrolls close to them on the page.
Google has announced that it is currently testing expanded lazy loading that also includes video and audio elements. That is to say, multimedia content positioned inside a video or an audio HTML tag. Granted, these aren’t quite as common as images or even iframes on the modern web, but they still have their uses.
The lazy loading change is apparently coming to Chrome 148 on both desktop and mobile. Since Google is committing it to the Chromium codebase, we expect it to come to other Chromium-based browsers as well, like Microsoft Edge.
Source
