[1] Add about:unicorn easter egg. · whatwg/fetch@de21fbc ( 版) <https://github.com/whatwg/fetch/commit/de21fbc2e20230a5d82398aecb329dfd979ce5e0>
[2] Unicorn ( 版) <http://media.opera.com/media/press/2011/unicorn/>
[3] CSS Expressive Generalizations and Gadgetry Level 1 ( 版) <http://dev.w3.org/csswg/css-egg/>
[4] Opera 11.60 beta debuts with double-rainbow support - Opera Software ( 版) <http://www.operasoftware.com/press/releases/desktop/opera-11.60-beta-debuts-with-double-rainbow-support>
[5] Remove about:unicorn (annevk著, ) <https://github.com/whatwg/fetch/commit/67e21272425498d26a8e75c3c9b7192099968ffe>