Is there a way to try and load a file in HTML/JavaScript and have a fallback if it doesn't load?

I just switched to start using a CDN for external images/static files for my site and I wanted to know how I could build a backup in case this CDN failed. Is there a way to reference an external link in an HTML/JavaScript file that would let you specify a fallback location for that file if it is unavailable in the first external host?

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