What is disposition: enforce in CSP frame-ancestors?

Question

Quoting from here,

If a resource is delivered with a policy that includes a directive named frame-ancestors and whose disposition is "enforce", then the X-Frame-Options header will be ignored, per HTML’s processing model.

I don't understand the part that mentions 'disposition is "enforce"'. Can't find examples. Could someone shed some light on this?

Answer 1

According to https://w3c.github.io/webappsec-csp/#policy-disposition: 'Each policy has an associated disposition, which is either "enforce" or "report".' This corresponds to Content-Security-Policy and Content-Security-Policy-Report-Only, respectively. If you are using the "Report-Only" version of CSP, X-Frame-Options will not be ignored as you are not enforcing the overriding policy.