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screenshot with an example I tried to add Noto Color Emoji from Google Noto as my font for Emoji in GNU Emacs, as mentioned in here, but for some reason GNU Emacs doesn't display these characters properly in its window. I'm using GNU Emacs 24.5.1 on GNU/Linux. Is this a bug or am I doing something wrong?

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You're not doing anything wrong.

Emacs for Linux uses XFT for font rendering, and XFT doesn't yet support the color fonts. See this mailing list thread from Dec 2015. Richard Stallman writes in that thread that it's a low priority and they don't care about color fonts. Also in that thread you can see that they disabled color fonts in Emacs for Mac, not for any technical reason but because color fonts are not supported in the Unix version of Emacs and they don't want the Mac version to have a feature that is not in the Unix version.

So I wouldn't expect to see this any time soon.

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