!!! Overview
[{$pagename}] ([RFC 7469] [HPKP]) defines a new [HTTP Header Field] that allows web host operators to instruct [user-agents] to remember ("pin") the hosts' [cryptographic] identities over a period of time.  

During that time, [user-agents] will require that the host presents a [Certificate Chain] including at least one Subject [Public Key] Info structure whose [Certificate Fingerprint] matches one of the pinned [Certificate Fingerprint] for that host.  By effectively reducing the number of trusted authorities who can [authenticate] the domain during the lifetime of the pin, pinning may reduce the incidence of [Man-In-The-Middle] [attacks] due to compromised [Certification Authorities|Certificate Authority].

[{$pagename}] is a form of [Certificate Pinning]

!! Intent To Deprecate And Remove: Public Key Pinning
The problem with [HPKP] is that it can be quite a complex idea to get your head around and requires a perfect deployment otherwise things can go wrong.[2]
* 2017-10-27 [Google] published Intent Public Key Pinning. [1]
* 2017-10-24 I'm giving up on HPKP - Scott Helme [2]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Google published Intent Public Key Pinning|https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/he9tr7p3rZ8|target='_blank'] - based on information obtained 2017-10-30- 
* [#2] - [I'm giving up on HPKP|https://scotthelme.co.uk/im-giving-up-on-hpkp/|target='_blank'] - based on information obtained 2017-10-30-