[13] DeviceOrientation Event とは別物です。
[1] The Screen Orientation API ( ( 版)) <https://w3c.github.io/screen-orientation/>
[2] Screen Orientation Status ( (Mounir Lamouri 著, 版)) <http://lists.w3.org/Archives/Public/public-webapps/2014AprJun/0038.html>
[3] The Screen Orientation API ( ( 版)) <http://www.w3.org/TR/2014/WD-screen-orientation-20141023/>
[4] The Screen Orientation API ( 版) <http://www.w3.org/TR/2015/WD-screen-orientation-20150428/>
[5] The Screen Orientation API ( 版) <http://www.w3.org/TR/2015/WD-screen-orientation-20151223/>
[6] The Screen Orientation API ( ()) <https://www.w3.org/TR/2016/WD-screen-orientation-20160527/>
[7] w3c/screen-orientation: The screen orientation specification ( ()) <https://github.com/w3c/screen-orientation>
[8] The Screen Orientation API () <https://www.w3.org/TR/2016/WD-screen-orientation-20160708/>
[10] The Screen Orientation API () <https://www.w3.org/TR/2016/WD-screen-orientation-20160718/>
[11] The Screen Orientation API () <https://www.w3.org/TR/2016/WD-screen-orientation-20160721/>
[12] The Screen Orientation API () <https://www.w3.org/TR/2016/WD-screen-orientation-20161031/>
[14] ここ何年か、細かい変更は行われているものの実質的な変更はなく、 メンテナンスがほとんどされない状態で他の仕様書との整合性も欠いているようです。 廃棄されているわけではなさそうですが、優先度が低いのでしょう。
[16] Requesting wide review of Screen Orientation API (Léonie Watson著, ) <https://lists.w3.org/Archives/Public/public-webappsec/2016Nov/0003.html>
[17] Add [Exposed=Window] extended attribute to ScreenOrientation interface by alexshalamov · Pull Request #107 · w3c/screen-orientation () <https://github.com/w3c/screen-orientation/pull/107>
[18] The Screen Orientation API () <https://www.w3.org/TR/2017/WD-screen-orientation-20171101/>
[19] The Screen Orientation API () <https://www.w3.org/TR/2017/WD-screen-orientation-20171103/>
[20] The Screen Orientation API () <https://www.w3.org/TR/2017/WD-screen-orientation-20171104/>
[21] The Screen Orientation API () <https://www.w3.org/TR/2017/WD-screen-orientation-20171105/>
[22] The Screen Orientation API () <https://www.w3.org/TR/2018/WD-screen-orientation-20180508/>
[23] The Screen Orientation API () <https://www.w3.org/TR/2018/WD-screen-orientation-20180509/>
[24] The Screen Orientation API () <https://www.w3.org/TR/2018/WD-screen-orientation-20180530/>
[25] The Screen Orientation API () <https://www.w3.org/TR/2018/WD-screen-orientation-20180531/>
[26] The Screen Orientation API () <https://www.w3.org/TR/2018/WD-screen-orientation-20180601/>
[27] The Screen Orientation API () <https://www.w3.org/TR/2018/WD-screen-orientation-20180706/>