even the sites using one of these 3 CDNs probably specify aa specific minor version of jQuery from this list <a href="http:&#x2F;&#x2F;code.jquery.com&#x2F;jquery&#x2F;" rel="nofollow">http:&#x2F;&#x2F;code.jquery.com&#x2F;jquery&#x2F;</a><p>(OK, so I doubt many sites are specifying the beta or uncompressed versions, but there&#x27;s still a pretty good chance that somebody hasn&#x27;t downloaded the relevant version from the relevant CDN recently enough for it to be in their cache, especially if they&#x27;re browsing on their phone)