[1]
[CITE[Pages using <picture> (sorted by MD5 of URL)]] ([CODE[2007-12-27 01:29:06 +09:00]] 版) <http://canvex.lazyilluminati.com/survey/2007-07-17/analyse.cgi/pages/tag/picture>
([[名無しさん]])


[2]
[CITE[HTML5 IRC logs: freenode / #whatwg / 20071225]] ([TIME[2007-12-27 01:31:25 +09:00]] 版) <http://krijnhoetmer.nl/irc-logs/whatwg/20071225#l-150>

[3] [CITE[IRC logs: freenode / #whatwg / 20130930]]
( ([TIME[2013-10-03 20:18:29 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20130930>


[4] [CITE@en[Use Cases and Requirements for Standardizing Responsive Images]]
( ([TIME[2013-11-06 19:34:20 +09:00]] 版))
<http://www.w3.org/TR/2013/NOTE-respimg-usecases-20131107/>