[1] Protocols and Formats Working Group Public Page (2006-12-22 00:44:58 +09:00 版) http://www.w3.org/WAI/PF/

[2] IRC logs: freenode / #whatwg / 20140724 ( (2014-07-25 09:37:20 +09:00 版)) http://krijnhoetmer.nl/irc-logs/whatwg/20140724

[3] Suggestions for opening up PF (Steve Faulkner 著, 2015-04-08 18:09:43 +09:00 版) https://lists.w3.org/Archives/Public/www-archive/2015Apr/0018.html

[4] Media Accessibility User Requirements ( (2015-12-02 07:22:59 +09:00 版)) http://www.w3.org/TR/2015/NOTE-media-accessibility-reqs-20151203/