Fade a popup in instead of immediately displaying it

[1234ru]

Currently I have a code initializing a popup like this:

something.magnificPopup({
    callbacks: {
        open: function() {
            this.content.hide();
            this.content.fadeIn();
        }
    }
});

I hope you understand what I mean. Is there a better way to do this?

Note: it would be even better if the solution applies to the whole popup set (including background etc.), not just to the content.