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http://url.spec.whatwg.org/#parsing scheme data state: [[ If c is "?", set url's query to the empty string and state to query state. ]] This seems incompatible with data: processing. These seem to do the same thing: data:,test?test data:,test%3ftest
It's not incompatible if the data: processing layer joins the scheme data and the query.
Right (plus adds a ? in between).
Ok, but where is that defined?
In http://simonsapin.github.io/data-urls/
Which is linked from http://fetch.spec.whatwg.org/ so I think all is connected.