Re: proposal: @supports and :supports

* Boris Zbarsky wrote:
>Testing for "is the feature there?" works.  Testing for
>"does the UA say the feature is there?" does not work.

That doesn't sound very meaningful without some definition of these
concepts. It seems a "test" like

  if (obj.method_name) ...

is "testing" for "does the UA say the feature is there?" How would
a client side "test" for "is the feature there?" look like? I can't 
think of one that would be meaningful in practise.
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