try to put the working html in your public dir and request it directly
( or in some other way try to request it over tcp from localhost as
opposite to opening it directly with a file:// moniker.
I've accessed it through Apache (pointing at my localhost) and it works
fine.
My ugly hack so far is to generate the SVG with a static name and have a
static webpage point to that. Then I redirect to the static page.
(So the workflow is: user submits form, I generate the new SVG with the
constant name, then I redirect them to the html page that embeds that file)
Chris