I think SVG is problematic till now, it's not recommended for
commercial epub at least.
I saw you took part in this thread,
"Epub on IPad: SVG-graphics don't show"
But I can't see what's the concusion of that thread.
About SVG on iPad, I' wrote too hastily, so I altered "at all" to "very well".
I also found a comment of SVG by "frabjous" in another thread,
Support for SVGs is very inconsistent and immature on various reading platforms.
That means SVG is not reliable and recommended?