Kindle keyboard devices that run on 3.x firmware (including the jailbroken Kindle 2, updated to 3.x firmware), support the JavaScript version for ES3 and do not have HTML5 layout, similar to that supported by Internet Explorer 8.
New Kindle electronic devices such as PaperWhite, Oasis, and Voyage 5.x firmware support JavaScript for JavaScript and some HTML5 features similar to the original iPad running iOS 5.0.
You can check the source code for the browser that Amazon ships with the open source download package. It is based on WebKit sources around 2009 with some settings for rendering electronic ink. The browser passes the Acid 3 compliance test to 100 out of 100 passing tests and is almost completely consistent with the reference rendering.
The main problem with the browser on older Kindle devices is that outdated SSL certificates mean that any site that requires SSL (https, not just http) does not load. Amazon has released a crash fix that all users must apply so that they can simultaneously browse the web and connect to Amazon's digital store.
Matt hargett
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