WebP is widely supported by every major browser. https://caniuse.com/?search=webp
Golang and WebP were both developed at Google. https://en.wikipedia.org/wiki/WebP https://en.wikipedia.org/wiki/Go_(programming_language)
Golang has image decoder / encoder support for Gif, Jpeg, and Png... but not WebP. https://pkg.go.dev/image@go1.19.2#section-directories