I believe the example code within the additional information dropdown is perhaps insufficient. It doesn't cover all of the success criterion listed above it in 2.15.

Current example:

<img src="image.webp" alt="..." loading="lazy"/>
<iframe src="video.html" title="..." loading="lazy"></iframe>

Proposed example:
I don't think <iframe> is needed here, as 2.15 is exclusively about images rather than other media, which is in 2.16.

Using picture with multiple sources.

<picture> 
<source type="image/avif" srcset="image.avif">
<source type="image/webp" srcset="image.webp">
<img width="" height="" src="image.jpg" alt="" loading="lazy"/>
</picture>

This could be further expanded to include different sizes.
Less of a fan of 1x, 2x but it is simpler for a quick example rather than widths and sizes.

<picture> 
<source type="image/avif" srcset="image.avif, image.avif 2x" >
<source type="image/webp" srcset="image.webp, image.webp 2x">
<img width="" height="" src="image.jpg" srcset="image.jpg, image.jpg 2x" alt="" loading="lazy"/>
</picture>

It's still a very simple example but helps to convey more of the SCs within 2.15.
Wonder what others think and whether other examples, even if they are these quick ones, need checking for how they relate to the SCs above them.