I honestly can't see the benefit of bundling common libraries at all. It requires a bunch of infrastructure to manage it and quickly becomes out of date. Not worth it to save a few tens of K as a one-time download - not a significant amount at all in today's terms.

What would help is if more people could link a script from a common location so that it was already cached by the standard browser mechanisms. This is already happening to some extent.

But linking external scripts does have a problem in that you have to trust the site you're linking not to change the script (or get compromised) to add malicious features. A cryptographic hash of the file you expect could be used to mitigate this issue, perhaps for other types of file too. And such a feature could fall within HTML5's purview.

For example:

    <script type="text/javascript"
        src="http://www.sharedscripts.com/jquery-1.2.3.js";
        contenthash="sha1:aaf4c61ddcc5e8a2dabede0f3b482cd9aea9434d">
    <link rel="stylesheet" type="text/css"
        src="http://www.sharedscripts.com/nice-4.5.6.css";
        contenthash="sha1:0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33">

--
And Clover
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