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Re:Chromium/Blink – Intent to Implement: Experimental Framework by mappu on Monday October 12, 2015 @12:49AM (#10372626)
Something like

    -webkit-will-be-removed-on-2015-10-17-border-radius:
Re:Chromium/Blink – Intent to Implement: Experimental Framework by jewel on Monday October 12, 2015 @02:36AM (#10372869)
This is a great solution, in my opinion. Perhaps it could include the browser version instead:

    -chrome-46-faster-font-engine:
This will allow any developer to opt in, with an explicit understanding that when the next browser version comes out the feature will disappear.

console.warn can be used to give a URL where developers can go to give feedback.