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    @AnthonyGrist it's not a duplicate, since that question is old and the answers out-dated.
    – Alnitak
    Commented Jul 2, 2012 at 13:44
  • There is no simple solution or easy answer. You must do the work, check every plugin for compatibility, go through the jQuery release notes and check your custom jQuery code line by line. Otherwise, just upgrade and test everything thoroughly. Whatever you decide, you'll still have to troubleshoot and fix any JavaScript errors.
    – Sparky
    Commented Jul 2, 2012 at 13:49
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    @Alnitak The question I marked as a possible duplicate is newer than the version of jQuery he's upgrading from. The only valid point is that the information may be outdated, though I think the accepted answer on that question addresses the main point of this question - how good is jQuery's backwards compatibility? Commented Jul 2, 2012 at 13:52
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    @AnthonyGrist the relevant date would be the release of the version he's upgrading to, and the current answer is "not as good as it used to be" !
    – Alnitak
    Commented Jul 2, 2012 at 13:54