Macro sequence 

macro_rules! sequence {
    ( $( $op:expr ),* $(,)? ) => { ... };
}

Allows you to do a sequence of animations inside of a parallel block

parallel![
    sequence![
        cw.close_button().scale().to(Vec2::ONE * 0.8).over(0.3.s()),
        cw.close_button().scale().to(Vec2::ONE).over(0.3.s()),
    ],
    click.play(),
],