gwt 2.5 - Elemental -> Browser compatibility question ?

Hello,

Reading the official documentation  :

https://developers.google.com/web-toolkit/articles/elemental 

it is said that :

 Using these draft-spec extensions may result in code that doesn't work on Firefox, Opera, or IE. 

My question, is that, for my current project that will be in production in 1 or 2 month, should I use Elementals ? I need a compatibility with IE 7 and greater versions, Chrome and Firefox.

I also did found a lot of documentation about elemental (neither how to use it, ..., neither inside the javadoc)

Thanks you.

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