It's finally here! Google Chrome support native lazy loading by adding the loading attribute to an image and an iframe!
More info at https://web.dev/native-lazy-loading
"Lazy loading is a design pattern commonly used in computer programming to defer initialization of an object until the point at which it is needed. It can contribute to efficiency in the program's operation if properly and appropriately used. The opposite of lazy loading is eager loading." -Wikipedia
Here is a sample code:
The loading attribute in img and iframe elements supports the following values: