How to enable lazy-loading for inline-images and iframes?

 1. Enable Lazy-load images and iframes filter in your favorite text-format:

2. Select which elements should be lazy-loaded:

3. That's it.

You don't need to modify your content at all; as long as Lazy-load filter is enabled in the text-format your content created with. Selected elements; images and/or iframes would automatically load lazily.