Web Reference: The jQuery upgrade guides provide information on all breaking changes and some notable changes in pinnacle versions of jQuery. Overall, jQuery has had very strong backwards compatibility throughout its history. Use the following steps to upgrade from a version of jQuery older than 1.11.0 or 2.1.0 to this new version 4.0: Upgrade the version of jQuery on the page to the latest 1.x or 2.x version. Add the uncompressed jQuery Migrate 1.x Plugin to the page. Upgrade the version of jQuery on the page to the latest 3.x version and add the uncompressed jQuery Migrate 3.x plugin to the page. Test the page and resolve any warnings that appear on the console, using the JQMIGRATE 3.x warning documentation as a guide.
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