Support the ‘loading’ attribute, which can be used to defer the load of below-the-fold iframes and images on the page until the user scrolls near them. This is to reduce data usage, memory usage, and to speed up above-the-fold content. Web developers can opt-in to lazy load by specifying loading=lazy on <iframe> and <img> elements.
Docs: https://docs.google.com/document/d/1e8ZbVyUwgIkQMvJma3kKUDg8UUkLRRdANStqKuOIvHg/edit https://docs.google.com/document/d/1ITh7UqhmfirprVtjEtpfhga5Qyfoh78UkRmW8r3CntM/edit https://docs.google.com/document/d/1jF1eSOhqTEt0L1WBCccGwH9chxLd9d1Ez0zo11obj14/edit
Samples: https://scalable-loading-contribs.firebaseapp.com/test.html https://mathiasbynens.be/demo/img-loading-lazy
Explainers: https://github.com/scott-little/lazyload https://docs.google.com/document/d/1e8ZbVyUwgIkQMvJma3kKUDg8UUkLRRdANStqKuOIvHg/edit