What are the integrity and crossorigin attributes?

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Both attributes have been added to Bootstrap CDN to implement Subresource Integrity.

Subresource Integrity defines a mechanism by which user agents may verify that a fetched resource has been delivered without unexpected manipulation Reference

Integrity attribute is to allow the browser to check the file source to ensure that the code is never loaded if the source has been manipulated.

Crossorigin attribute is present when a request is loaded using ‘CORS’ which is now a requirement of SRI checking when not loaded from the ‘same-origin’.
More info on crossorigin

More detail on Bootstrap CDNs implementation

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