Handle deserialization failures in postMessage() #1130
Merged
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This is part of whatwg/html#2530; see related links there for more information. Closes #1116.
It is on top of #1102, so that needs to be merged first. In addition, the HTML PR needs to be merged first so that the messageerror event type is actually defined somewhere; once that's done the Bikeshed HTML needs to be regenerated.
Also, this needs some tests, which I will write.