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| Version targeting ： ウィキペディア英語版 |
Version targeting
In computing, version targeting is a technique that allows a group of (presumably knowledgeable) users (including software developers) to utilise some advanced software features that were introduced in a particular software version while allowing users accustomed to the prior versions to 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.
The term ''version targeting'' is mostly applied in the context of Web browsers, although the concept is not limited to any specific kind of software application. In Web browsers, a DOCTYPE declaration serves a similar purpose.
==In Mozilla Firefox==
Version targeting has been used in Mozilla Firefox〔http://www.alistapart.com/articles/minorthreat〕 when it introduced JavaScript 1.6 in Firefox 1.5〔https://developer.mozilla.org/en/New_in_JavaScript_1.6〕 and JavaScript 1.7 in Firefox 2.0:〔https://developer.mozilla.org/en/New_in_JavaScript_1.7#Using_JavaScript_1.7〕 developers willing to use the new scripting engine had to explicitly opt-in.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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