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How to write a fallback for css files not loaded, loading too long and blocked? [duplicate]

How to load local copy of bootstrap css when the cdn server is down?

How to load a local copy of a generic CSS file when CDN is down? [duplicate]

How to use Bootstrap CDN?

How to use cross domain dynamically generated CSS

How to detect when one or more JS/CSS library fail to load (e.g. CDN)?

How to enable CDN CSS in Brackets, Chrome?

How to implement a CDN failsafe for css files?

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