How to set fancybox options for data-fancybox="gallery"?

Question

JavaScript

For the class I use

$(".fancybox").fancybox({
        //опции
    });

but how to set options for data-fancybox="gallery" tag?
fancyapps.com/fancybox/3

Answer 1

So?

$("[data-fancybox='gallery']").fancybox({
        //опции
    });

Answer 2

Have you read the doc at all?
fancyapps.com/fancybox/3/docs/#options
Scroll down, there is this thing:

<a data-fancybox data-options='{"caption" : "My caption", "src : "iframe.html"}' href="javascript:;">
  Open external page using iframe
</a>