Re: [webcomponents] The algorithm "invoke callbacks" must halt as soon as one of callbacks throw an exception (#421)

I'm not sure that makes sense. E.g., when setting `innerHTML` the operation will have succeeded by the time you propose we throw an exception from the setter. It makes more sense to me to handle these callbacks similar to event listener callbacks and use the "report the error" mechanism. And therefore not failing when a callback throws an exception either.

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