lazyload

Expected Behavior

Running validator https://validator.w3.org on basic <picture> elements as per setup config should not result in errors.

Current Behavior

Currently when running validator on:

<picture class="lozad" style="display: block; min-height: 1rem" data-iesrc="images/thumbs/04.jpg" data-alt="">
    <source srcset="images/thumbs/04.jpg" media="(min-width: 1280px)">
   

Describe the bug
On the frontend, the embed post block generates an iframe that loads the embedded posts, but when the Lazyload for iframes is enabled, embedded posts are not loaded in the Chrome browser.

Lazy load status for iframe does not change from data-ll-status="loading" to data-ll-status="loaded".

On Firefox embedded post iframe is lazy loaded.

To Reproduce
Steps to