ha…i read that article the other day too and meant to figure out how to add it the webflow project i am working on. i haven’t tried it yet but i’m sure it is just a matter of adding that code to the custom code section and modifying the selector to be whatever tag webflow adds to all images…i suspect it would be w-img but haven’t checked yet.
edit: I just checked and the class is image if you use background images so add the below to custom code should cover both: