xhr

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According to https://xhr.spec.whatwg.org/#response-mime-type:

If mimeType is failure, then set mimeType to text/xml.

Note: The content-type of the blob is set to "" (an invalid mime type) when the input type is not set or is invalid.

Test	Firefox	Chrome	Safari
no content type	text/xml	null	""
bad content type	text/xml	null	""

Related to: https://github.com/whatwg/fetch/issues/1464 and https://github.com/whatwg/fetch/issues/1436

I'm not entirely sure how to interpret this. Are you simultaneously pointing out that it's inconsistent with blobs and that browsers are not aligned on this?

Ah, sorry just that browsers are not aligned on this.

I see, I kinda suspect this already has test coverage so unless that's not the case or someone wants to make a change to the spec this might be a good fit for the Interop effort?