Seems a bit pointless
What's this got that can't be accomplished, in a less heavyweight fashion, with something like jQuery UI?
Devs at HP's Enyo project – the framework that once powered the applications on HP's discarded WebOS TouchPad tablet – have just released a stable version of the second major iteration, Enyo 2.0. The first iteration of Enyo – Enyo 1.0 – was intended as a platform-independent tool kit and was focused on apps on the Web OS …
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It's not really about a lightweight implementation in terms of code, but Enyo does have some interesting aspects. You deal with enyo controls not html controls, you lay components out horizontally and vertically with ratios not percents or pixels and it does some clever stuff with lists that means a list can have hundreds of entries but only a screenful and a bit are in the dom at any point, which can make it pretty snappy on lower end hardware.
I'm not sure where they think the framework is going in terms of support in the industry but I can understand why they didn't want to just chuck it away, there's obviously been a lot of thought put into it by some clever and sensible engineers...