Transparent backgrounds with HTML resources

Is there any way to make MediaSignage ignore the background of an HTML page so everything but the actual content of the page is transparent?

We have not tried transparent HTML. I don't think its supported.
Eddie.

I know this is an old post, but it fits exactly my need.  Are transparent HTML viewer backgrounds supported yet?  If so, how do I do it?  If not, is it something that may be supported in the future?  I'm very interested in this feature.

We have never tested it so I can't comment on the issue, but we do support FireFox embedded so it may be an option for using External application.