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[1] RFC 5988 - Web Linking ( ( 版)) <http://tools.ietf.org/html/rfc5988#page-16>

[2] IRC logs: freenode / #whatwg / 20130306 ( ( 版)) <http://krijnhoetmer.nl/irc-logs/whatwg/20130306#l-72>

[3] Web Applications 1.0 r8316 Move away from angle brackets and towards proper Unicode characters, since Unicode font support is widespread now. ( ( 版)) <http://html5.org/tools/web-apps-tracker?from=8315&to=8316>