On Tue, May 13, 2014 at 5:44 PM, Boris Zbarsky <bzbar...@mit.edu> wrote:
> I slightly worry about the performance implications of this and the number
> of changes to UAs this will require: any place inside a UA that examines
> attribute values (only for global attributes?) would need to consult this
> reservation information, right?

Yes. Though maybe not for styling?

I suspect if we're going to allow genuine subclassing of existing
elements, you would want to potentially override attributes there too.


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