[1] [whatwg] HTML: A DOM attribute that returns the language of a node ( (2013-05-01 17:49:20 +09:00 版)) http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2013-May/039480.html

[2] [whatwg] HTML: A DOM attribute that returns the language of a node ( (2013-09-19 00:03:50 +09:00 版)) http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2013-September/040866.html