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I'm checking the options to harden my web app by setting the appropriate HTTP headers.

Besides the Content Security Policy (CSP) there are two another approaches: Document Policy and Permissions-Policy (Feature-Policy).

I've checked the W3C Relation to Feature Policy documentation, but still can't grasp the clear answer wherever I need to set both policies: Document and Permissions or it is overshooting and it's enough to set just Permissions-Policy?

P.S. Feel free to forward this question to the SE's Web Applications or StackOverflow portals, if the question doesn't fit so much this portal.

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Document-Poicy is for more performance/best-practice options. Permissions-Policy is for handling "powerful" features that you don't want third-parties or new devs using.

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