I believe this depends on browser. If you open in chrome all the images are webp format. It's a feature of cloudinary to detect the browser and serve the image in the format which is best for the requesting browser. It can be done by using f_auto flag in your cloudinary image request urls.
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You mentioned images are in webP format. But in the source code, and when inspecting any image in dev.to site, I only find pngs.
How is it done?
I believe this depends on browser. If you open in chrome all the images are webp format. It's a feature of cloudinary to detect the browser and serve the image in the format which is best for the requesting browser. It can be done by using f_auto flag in your cloudinary image request urls.