We are trying to determine whether it's possible to have an image (an SVG in this case) change color on-hover, and for that image to also act as a link. .image-class:hover {color: blue} doesn't seem to apply to SVG. Just wanted to confirm that :hover is actually supported, since it's totally possible PDFs don't support them.

Sorry, :hover isn't currently supported, at least in the sense that it doesn't match any elements.