if ( e.keyCode === OO.ui.Keys.LEFT || e.keyCode === OO.ui.Keys.UP ) {
        nextItem = element.getRelativeFocusableItem( this, -1 );
    } else if ( e.keyCode === OO.ui.Keys.RIGHT || e.keyCode === OO.ui.Keys.DOWN ) {
        nextItem = element.getRelativeFocusableItem( this, 1 );
    }