Re: [w3c/webcomponents] Steps in element definition that throw an exception should abort (#543)

It does say to throw but it doesn't say to abort the steps. So it's somewhat ambiguous as to whether we should keep executing `Get(prototype, callbackName)` on other callback names or not.

Now, it's quite obvious from the semantics of JavaScript that we can't keep issuing `Get`s when there is a pending exception being thrown but we should explicitly state that in the specifications.

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