1. Resource Hints: Lazyload

    Gives a hint to the browser to lower the loading priority of a resource. Please note that this is a legacy attribute, see the [`loading`](https://caniuse.com/#feat=loading-lazy-attr) attribute for the new standardized API.

  2. Lazy loading via attribute for images & iframes

    The `loading` attributing on images & iframes gives authors control over when the browser should start loading the resource.