Came here to say the exact same thing. P3P may be "officially" obsolete, but if your business wants older browsers to be able to handle your code, you're going

Came here to say the exact same thing. P3P may be "officially" obsolete, but if your business wants older browsers to be able to handle your code, you're going to have to deal with it. If you have the misfortune of encountering it, you can get really hard to detect bugs with ajax calls or script files not getting loaded in IE when you don't have P3P set up correctly. (for instance: https://www.techrepublic.com/blog/software-engineer/craft-a-p3p-policy-to-make-ie-behave/ https://www.techrepublic.com/blog/software-engineer/craft-a-...)