For HTML animations use Edge.
You can try to export your selected animations as Flash CS5 Professional format and then convert them to HTML5 animations with
-free flash plugin http://www.google.com/doubleclick/studio/swiffy/ (there´s online converter for testing)
-Flash Professional CS6 which can export HTML5
Then you can continue wotking with them in HTML5 editor like Edge....
For those looking for a Google Swiffy replacement now that the service has been closed, FlaExporter provides a viable alternative.
Here's why --
1)Google shut down Swiffy on July 1st.
2)Development on Mozilla Shumway seems to have stopped.
3)Fortunately there is a new tool, FlaExporter, that picks up where Swiffy left off. FlaExporter is a new way to publish high-performance HTML5 content directly from your Adobe Flash or Animate files without having to restructure anything. It even has an option to auto-optimize during publish that typically results in files that are 60-80% smaller. Some key features --
* Blazing fast mobile and desktop web performance (60 FPS)
* No .fla restructuring required
* Reduce file sizes 2-10X
* Use advanced features like mask layers, blend modes, and timeline ActionScript
More Info --