Cargo Features

[dependencies]
webp = { version = "0.3.0", default-features = false, features = ["img"] }
default = img

The img feature is set by default whenever webp is added without default-features = false somewhere in the dependency tree.

img default = image

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

image img