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If you are a Creative Cloud subscriber, be sure to make note of the update to Flash Professional today. Despite being listed as a "Bug Fixes" update, this is actually a quite significant update as it now includes the ability to natively create HTML5 Canvas animations. This is done via the CreateJS library.
After updating Flash Pro, you will see the option right away in the opening dialog:
For more information, check out the documentation and let me know what you think.