I am dogfooding my own blog and its compatibility with my RSS reader and aggregator.
I have used .webp on images in prior blog posts. It’s a format that works well on the web, and allows some compression and optimized loading, which is nice for the browser experience.
However, it does not seem to be compatible at all with FreshRSS, or my RSS readers, even in Web Reader mode.
Enjoy this photo of a Bushtit while I test.