[1] IRC logs: freenode / #whatwg / 20090714 (9/19/2009, 8:07:55 AM 版) <http://krijnhoetmer.nl/irc-logs/whatwg/20090714#l-487>

[2] Add framespacing to obsolete-attributes list · whatwg/html@a7e2dd5 (9/2/2015, 7:35:42 AM 版) <https://github.com/whatwg/html/commit/a7e2dd5ba7153541102f417f939acfe1cdd8e5ec>