If connecting to a CDN is acceptable, then firewall settings may need to be changed to permit an “always on” state for these connections to external sites). As long as the reference can be reached with a browser by calling a URL, then the reference will work fine. Marc does recommend administrators confirm network bandwidth prior to deciding on where to store jQuery and the related .js files. Of course, scripts need to access reference materials as quickly as possible, so it makes sense to confirm available bandwidth before proceeding on development likely to be unusable for users across a slow network.
Marc demonstrates how to equip scripts to flexibly modify communications methods, as required should the external repository require an encrypted, or non encrypted connection. He also explains some of the differences in working with Master Pages in SharePoint 2013, versus earlier server versions.
Of course, the purpose of adding these references to scripts is to enable use of jQuery.
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