I am working with the diagrams package for haskell, and I am using the SVG backend. I embed the SVG markup directly into an HTML document, so that the graph as a part of a web page. I have built a pretty cool looking bar graph, and I would like to add some basic interactivity to it. For example, when you hover over a bar, I'd like to make the color lighter. Or maybe something would pop up as well. The way that I would like to accomplish this is by setting the class attributes of some of the SVG nodes. Is this possible with the diagrams package? I know that it can target multiple backends and that that class attribute likely has no meaningful counterpart in most of them, but I was wondering if there is nevertheless a way to sneak in backend-specific information. Thanks for any insights that anyone can provide.