[1] Web Applications 1.0 r7770 Update to e-mail syntax checking for better compliance with the relevant RFCs. ( (2013-03-26 08:18:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=7769&to=7770

[2] Web Applications 1.0 r7978 Limit labels in e-mail addresses to 63 characters, not 255. ( (2013-06-15 03:49:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=7977&to=7978

[3] [whatwg] Comments on the definition of a valid e-mail address (Ian Hickson著, 2009-08-31 14:53:47 +09:00) https://lists.w3.org/Archives/Public/public-whatwg-archive/2009Aug/0807.html