Constant autofocus 

pub const autofocus: (&'static str, Option<&'static str>, bool);

Usage in rsx

let autofocus = "value";

rsx! {
    // Attributes need to be under the element they modify
    input {
        // Attributes are followed by a colon and then the value of the attribute
        autofocus: "value"
    }
    input {
        // Or you can use the shorthand syntax if you have a variable in scope that has the same name as the attribute
        autofocus,
    }
};