Re: [whatwg/xhr] Abandon hope of removing sync XHR from the web platform? (#20)

What are the obstacles to having stronger versioning facilities?  By versioning, I mean having a way to specify a compatibility level that implies an agreed upon set of API features.  If we developers had some way to specify compatibility requirements, the browser could either swap JS engines, or at least give a meaningful error to the user that the code they are trying to run is outdated.

It would also reduce the need for Rube Goldberg feature detection schemes like this one: http://stackoverflow.com/questions/29046635/javascript-es6-cross-browser-detection

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