Constant display 

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

Usage in rsx

let display = "value";

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