Re: [dom] Supported property names for NamedNodeMap (#141)

Yep, this `a:new` and `A:new` is not surprising. More interested is situation when supported property names contains duplicates (it is acceptable?) and what should be done if contains. In DOM for HTMLCollection we have always unique value, I check HTML and in most case we have unique value (but not always). Web IDL specification is very economical in their descriptions: http://heycam.github.io/webidl/#dfn-supported-property-names  

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