For most sites you want to get the benefits of a CDN, but it is still a single point of failure. I came across this pattern recently though that allows you to fail over to a local file if the CDN library doesn’t load. Would probably have to take a different approach with CSS libraries though.
Something I hope to explore more very soon is webpack, which might make this trick obsolete.
Update: It took me a while to find where I had originally found this idea, but I came across it again. Credit: http://minime.stephan-brumme.com/. They also have examples for several other popular client-side js libraries.
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