[1] [whatwg] Directory upload via <input type="file" directory> ( (2010-04-22 21:27:08 +09:00 版)) http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2010-April/025764.html

[2] Google Chrome Blog: Bringing another Chrome release to you, right on time ( (2013-01-10 22:02:46 +09:00 版)) http://chrome.blogspot.jp/2010/10/bringing-another-chrome-release-to-you.html

[3] Directory Upload (2015-06-26 06:23:49 +09:00 版) https://microsoftedge.github.io/directory-upload/proposal.html