Publication request: CR Snapshot of PNG third edition

 1. Information:
      * Document Title: Portable Network Graphics (PNG) Specification
        (Third Edition)
      * Document URL: https://www.w3.org/TR/2023/CR-png-3-20230921/
      * *Requirements for shortlinks redirection: (may apply if there
        are multi levels)
          o No change from previous publication
 2. Approvals:
      * Record of approval of the transition request
        <https://www.w3.org/Guide/transitions?profile=CR&cr=new#transreq>.
          o https://github.com/w3c/transitions/issues/566#issuecomment-1707188015
      * Team's approval state: approved
 3. *Skip CfE for CR text delete: (only needed when 'yes')
    No
 4. Checks:
      * Pass Pubrules' check: yes
          o The term "master" is found but it is not our term and we
            can't change it
      * Pass Link Checker's check:  yes
          o The two acm.org links, the science direct link and the
            loc.gov link are incorrectly flagged as broken

-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media