State of Elemental

I'm trying to understand if I can use Elemental in my project. I see this on the Elemental GitHub page: 

Currently, Elemental is generated from the WebKit project's WebIDL binding definitions which are used also
by the Dart project. Because of this, vendor prefixed APIs also show up (webkit specific). These APIs are
often also available on Firefox and IE. A future version of Elemental will generate these as well, either
as Mozilla/IE vendor prefixed calls, or as standardized non-prefix calls backed by multibrowser shim.

Does this mean that some features of Elemental won't work in Firefox and IE? If so, which ones? 

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