How do these icons work: ✅️?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Hypnotic Orient Looping

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Chapters
00:00 Question
01:02 Accepted answer (Score 144)
01:51 Answer 2 (Score 75)
02:32 Answer 3 (Score 26)
04:25 Answer 4 (Score 2)
05:21 Thank you

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Full question
https://superuser.com/questions/1173773/...

Question links:
[there's full file]: http://unicode.org/emoji/charts-beta/emo...
[document.title animation]: http://darker.github.io/series.html

Accepted answer links:
[called]: http://www.fileformat.info/info/unicode/...
[called]: http://www.fileformat.info/info/unicode/...
http://www.fileformat.info/info/emoji/br...

Answer 2 links:
[special font]: https://github.com/mozilla/emojione-colr
[emoji characters]: https://en.wikipedia.org/wiki/Emoji#Unic...
[only in versions 8.1 and onwards]: https://bugzilla.mozilla.org/show_bug.cg...

Answer 3 links:
[font]: https://github.com/mozilla/emojione-colr
[here]: http://unicode.org/emoji/charts/full-emo...

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Tags
#firefox #unicode

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