The Permissions Policy Header allows site owners to enable and disable certain web platform features on their own pages and those they embed. Being able to restrict the features your site can use is really nice but being able to restrict features that sites you embed can use is an even better protection to have." The Permissions Policy is just a rename of the "Feature Policy" header from a few years ago.gives you control over what site path information is passed along to other sites when you visitors click an external link.