Why do you care? You have no control over what e-mail clients are used by
your recipients or how they configure those e-mail clients. It is likely
that your recipients won't see the animation and possibly not even its first
image (i.e., they won't see it). Stop trying to turn e-mail messages into
web pages. If you want everything afforded by HTML then create a web page
and include a URL to it in your e-mail.
