Sure, if everyone decides to host their own files, a CDN would never be used. Although, there are benefits to using a CDN, so it's likely the try-shared value c

Sure, if everyone decides to host their own files, a CDN would never be used. Although, there are benefits to using a CDN, so it's likely the try-shared value could exist and would be useful. Note the proposed scheme doesn't prevent anyone from using a CDN as the src while also trying other CDNs to increase the chances of a cache hit, which has its own benefits. For example, <script src="https://code.jquery.com/jquery-3.4.1.min.js" https://code.jquery.com/jquery-3.4.1.min.js" try-shared="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js" https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.mi... try-shared="another-src">