It came up in the forum.
I never really noticed this before, but you can include an href in an svg file, and create a clickable image that way.
But does it work in Joomla?
(To be absolutely sure this is not a Joomla problem, I put the same html on a simple page outside of Joomla).
There are three ways to include an SVG: as image, as object and inline. So lets see what happens...
Simply as an image? Nope, the href doesn't work.
Using Object? Hmmm... it knows there's a link in there somewhere (the cursor changes to pointer), and the correct link shows up in the browser (bottom left), but the link doesn't actually work. There's a #document added to the HTML, but I don't know why.
Or adding the SVG inline? Yep. That does the trick.