Re: [webcomponents] Should parser extensibility be a design goal? (#113)

> I disagree. Some custom elements having to be defined prior to the use and others being upgraded later would be super confusing for consumers of custom elements.

I don't really agree it would be that confusing, but the opt-in via unusual parsing rules neatly sidesteps the issue, since it means all elements (including those with unusual parsing rules) can be upgraded. Since you seem to prefer that solution anyway, I think we're in accord.

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