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

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


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

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