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Probably the lack of a single sound format that is supported by all popular browsers on most platforms. And because animations can be easily done with JS/CSS, a

Probably the lack of a single sound format that is supported by all popular browsers on most platforms. And because animations can be easily done with JS/CSS, and that doesn't require all that much bandwidth or space, while good quality sound is considerably larger.

helipad 16y ago
Is it possible this might change with HTML5 in the future?
- Dramatize 16y ago
  Let's hope not.
- rawsyntax 16y ago
  if html5 video is any indication, it has to fall back to flash for browsers that don't support it, as well as encode the video in various codecs to account for different codec support (per browser)