<img>elements with a single
srcattribute defined on page load.
data-srcor any other attribute names that your website uses for this purpose).
<img>elements that are not descendants of an
<a>tag (anchor element). Tests can only be initiated on
<img>elements that are descendants of an anchor tag linking to the target article.
<picture>tags that do not properly have an
<img>element as a child.
<img>elements that have their
<img>element at mobile and desktop breakpoints: if the