cargo install cargo-feature
pacman -Syu cargo-feature
nix-env -iA nixos.cargo-feature
```
cargo feature -t build serde +serde_derive
cargo feature serde ^default
cargo feature serde --disable-default-features
cargo feature serde
cargo feature serde default
cargo feature serde --enable-default-features
cargo feature web_sys +HtmlDivElement
cargo feature web_sys HtmlDivElement
target.'cfg(target_arch = "wasm32")'.dependencies
cargo feature --target="cfg(targetarch = \"wasm32\")" websys HtmlDivElement
^
to remove featurecargo feature web_sys ^HtmlDivElement ```