Re: [whatwg/xhr] For sync XHR consider setting the service-workers mode to "none" to align browsers (Issue #397)

martinthomson left a comment (whatwg/xhr#397)

Just to add some spice, it has come to my attention that sync XHR and service workers have been proposed as a way of "fixing" asynchronous browser APIs.  If there is a browser API that you don't want to have asynchronous (WebCrypto, say) you can wire that up with a synchronous XHR, routing the resulting fetch via a service worker that holds the response until the promise resolves, to turn it into a blocking function call.  It's abominable, but thankfully it only seems to work in Firefox.  I suggest that maybe it shouldn't work at all.

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