Re: [csswg-drafts] [css-conditional-3] define whether/how it matters if namespace prefixes are declared

And I'd note that one of the relevant pieces here is that the [CSS Qualified Names](https://drafts.csswg.org/css-namespaces/#css-qnames) section of namespaces says:

> CSS qualified names can be used in (for example) selectors and property values as described in other modules. Those modules must define handling of namespace prefixes that have not been properly declared. Such handling should treat undeclared namespace prefixes as a parsing error that will cause the selector or declaration (etc.) to be considered invalid and, in CSS, ignored.

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Received on Wednesday, 17 October 2018 17:26:16 UTC