What's a feature policy?
Feature Policy gives site authors control over what features are going to be exposed on their web sites, whether in their own content, or in third-party content that they embed.
Policies can be set through an HTTP header (cleverly named
Feature-Policy) containing a
JSON-serialized policy, or through attributes on
<iframe> tags in an HTML document.
The demos on this site will tend to require a very recent browser (As of May 2017, that means Chrome 60+) as Feature Policy is very new, and still being standardized.