Captions

A caption at the bottom of the slide can be displayed with the "data-caption" attribute.

<a
    data-fslightbox="gallery"
    data-caption="<h2>An example title.</h2><h3>An example description.</h3>"
    href="/Image.jpg"
>Image</a>

Or using the JavaScript "captions" array prop.

fsLightboxInstances["gallery"].props.captions = ["<h2>An example caption.</h2>"];