[1] [CITE@en[RFC 5988 - Web Linking]]
( ([TIME[2012-03-22 09:19:11 +09:00]] 版))
<http://tools.ietf.org/html/rfc5988#page-16>

[2] [CITE[IRC logs: freenode / #whatwg / 20130306]]
( ([TIME[2013-03-18 20:29:40 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20130306#l-72>