Version targeting
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In computing, version targeting is a technique that allows a group of (presumably knowledgeable) users utilise some advanced software features that were introduced in a particular software version while allowing users accustomed to the prior versions still utilise the same software as if the new features were never added to the software. It is a way to ensure backwards compatibility when new software features would otherwise break it.
Version targeting has been used in Mozilla Firefox[1] when it introduced JavaScript 1.6 in Firefox 1.5[2] and JavaScript 1.7 in Firefox 2.0[3]: developers willing to use the new scripting engine had to explicitly opt-in.[1]
Version targeting was also a proposal by Microsoft for its Internet Explorer 8 product-in-development that was later cancelled.[4]