The features supported by the E-Ink Kindle and Kindle Format 8 e-books are described in the Amazon Kindle Publishing Guide, which can be found here: http://kindlegen.s3.amazonaws.com/AmazonKindlePublishingGuidelines.pdf
The relevant part of the document "Kindle Format 8 supports most HTML 5.0 features, although the following HTML features are not fully supported: forms, frames, and JavaScript."
, JavaScript Kindle Format 8 ebooks.