I really, really, really do need something that works the same as Silverlight - but isn't governed by the capricious behaviour of Microsoft. I have spent 5 years developing a product using Silverlight as the platform because it was the ONLY solution to what I was attempting to do (and believe me I looked EVERYWHERE)

If you could emulate Silverlight, you would have a world-beating product, believe me

Ditto.
I believe people come here looking for the features existed in Silverlight 5 not existing in HTML.
Most notable I could point out are RIA Services and related data controls, validation support, etc.

This would be fantastic!

Silverlight5 was indeed the BEST!!! Talk about killing something while it was at its absolute prime.

I'm asking a lot but I would like to see everything Silverlight 5 has. Intellisence, Animations, ToolBox in VS, Open In Blend from VS, Properties and Events window available in VS, In fact everything nothing less. I'll keep an eye on the progress.

For example, no LINQ support directly but an easy way to connect to a WCF service (web API) for data access. Async by nature so the UI stays responsive. Integration with ASP.net authentication and authorization features. Hookups to third party vendors so we can use their libraries either HTML5 or Silverlight type. Integrated Frame navigation between pages. Easy ways to create styles (maybe hookups to Bootstrap styles). I am pretty much following your efforts very close and I will use your product as soon as it is released as a final product. I am willing to help you test if necessary since I consider myself an expert Silverlight developer and I think I might be able to help you...