[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
Link: https://acme-v02.api.letsencrypt.org/directory;rel="index", https://acm e-v02.api.letsencrypt.org/acme/authz/2291281821/493486773054>;rel="up"