Subresource Integrity (SRI), a W3C standard, is a security feature which enables browsers to verify that files they fetch (for example, from a CDN) are delivered without unexpected manipulation. It works by allowing you to provide a cryptographic hash that a fetched file must match.

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Delegating responsibility to others which in effect gives them control to run script on your website is understandably concerning, particularly for certain classes of web asset. But there's a way that lets you have your public CDN cake and eat it too, and that's subresource integrity, here forth referred to as SRI.