Hi Xhris! As you rightfully conclude, unsupported transparency mode in PowerPoint is a significant limitation to all the other features offered with the application. A html page may have a complete Flash page buildup in transparency wmode, or static elements plus one, and more, SwfObjects stacked in a html markup, to be inserted as a PP slide page. A html body background is, however, always opaque as browser standard (default color: white) and cannot be made transparent with neither chroma filters, alpha opacity filters nor when inserted in an iFrame with a background set for transparency allowance. A resizable html page including a transparency mode SwfObject can sit on top of, or partially covering, bitmaps or other static objects which are inserted in a PP slide page, but the html body background cannot be made transparent. Not for the unsupported transparency in PP, but because of OP and browser standard restricting it.

Good luck with html insertions in PowerPoint. Perhaps something radically new may evolve from your work!

Cheers, Anders