Hi Toxaris. To be very honest, I am not even sure how to search for this in the specs.
The purpose of the link is this:
I am presenting the images in an appendix. The main book, for example, chapter 5 paragraph 6 has a link to "fig-A" in the appendix. Then I wanted to add a backlink to the svg wrapper which could take the reader back to the source paragraph. (This would be in case the device does not have a "back" button.)
If I put the link outside the wrapper, but still inside the div that contains the svg wrapper, the link splits off onto the next page/screen.
I do have a short list of the return links at the beginning of the appendix, and maybe users without a back button would have to scroll back to the beginning of the appendix to find the return link. There are only 3 full-page images in this section, so scrolling would not be too painful. But I don't know how to let the user know about that option.
Edited to Add: Well, I guess I could add a note to the image caption: "Please scroll down to return link (for split link), or if I use the list at the start of appendix, "Please scroll to appendix start for return link". It would look kind of awful, but it would work, I guess.
Second Edit to Add More: It's also an option that I could use just a simple <img> tag inside a normal div. Then a hyperlink in the caption would definitely work. But then there is the problem of the entire caption slipping over onto the next screen. That is why I wanted to use SVG wrapper, to keep the caption nailed to the image.