[1] document.styleSheetSets - Web API reference | MDN ( (2013-05-20 10:01:29 +09:00 版)) https://developer.mozilla.org/en-US/docs/Web/API/document.styleSheetSets

[2] [cssom] Remove API for alternative stylesheets · w3c/csswg-drafts@e5353d0 (2016-02-17 14:44:26 +09:00 版) https://github.com/w3c/csswg-drafts/commit/e5353d078e686136fdb28c7de37ffd375cd6d79f