<picture><source Type="image/webp" Srcset="http... -

: Browsers only download the file type they support and the image size that fits the screen, saving bandwidth. HTML picture element - MDN Web Docs

: You can serve different images entirely based on screen size using media queries within the tag (e.g., a square image on mobile, a landscape image on desktop). <picture><source type="image/webp" srcset="http...

It is the fallback for browsers that do not support the tag or WebP (e.g., very old browsers). : Browsers only download the file type they