[1] CSS Print Profile ( (2013-03-14 20:50:03 +09:00 版)) http://www.w3.org/TR/2013/NOTE-css-print-20130314/#section-properties

[2] CSS Print Profile ( (2004-02-26 05:17:25 +09:00 版)) http://www.w3.org/TR/2004/CR-css-print-20040225/#section-properties

[3] CSS Print Profile ( (2004-02-26 05:17:25 +09:00 版)) http://www.w3.org/TR/2004/CR-css-print-20040225/#section-properties

[4] Bug 19688 – Add autodetection of image orientation from EXIF information ( (2013-03-27 02:42:04 +09:00 版)) https://bugs.webkit.org/show_bug.cgi?id=19688

[5] 298619 – (exif) should consider using exif orientation flag when displaying JPEG images ( (2013-03-27 02:44:38 +09:00 版)) https://bugzilla.mozilla.org/show_bug.cgi?id=298619

[6] CSS Image Values and Replaced Content Module Level 4 ( (2013-03-26 23:59:09 +09:00 版)) http://dev.w3.org/csswg/css4-images/#the-image-orientation

[7] IRC logs: freenode / #whatwg / 20140519 ( (2014-05-22 17:23:00 +09:00 版)) http://krijnhoetmer.nl/irc-logs/whatwg/20140519#l-194

[8] Re: [css-color] Feedback on the image-orientation CSS property (fantasai著, 2018-07-02 14:32:16 +09:00) https://lists.w3.org/Archives/Public/www-style/2018Jul/0000.html

[9] image-orientation の既定値変更で壊れた例 EXIF