Shows browser support for the various formats of color fonts. (Most of these formats are of popular interest for emojis only at the moment. All could be used for other kinds of fonts, though.)

Color-Font-Support_Ubuntu-Bionic_Browsers.md

Chrome:

Version: 62.0.3202.94 (Official Build) (64-bit) User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36

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Firefox:

Version: 57.0 Build ID: 20171112125346 User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0

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Gnome Web (Epiphany):

Version: epiphany-browser 3.26.1-1ubuntu4 amd64 User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/605.1 (KHTML, like Gecko) Version/11.0 Safari/605.1 Ubuntu/18.04 (3.26.1-1ubuntu4) Epiphany/3.26.1

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Opera:

Version: 49.0.2725.39 User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36 OPR/49.0.2725.39

Outside of browsers, the Ubuntu desktop is gaining support mainly for CBLC/CBDT (Google's format and Noto Color Emoji) as well as SBIX (Apple's format and Apple Color Emoji), whereas color SVG and COLR/CPAL font support seems non-existent other than falling back to black and white. Can't recall if Microsoft's Segoe UI Emoji has black/white outline glyphs baked in or not, but I know this copy of Twemoji Color Font does.

Here's some screenshots:

Noto Color Emoji (CBLC/CBDT):

Apple Color Emoji (SBIX):

(Note: My copy of Apple Color Emoji is a bit out of date, so it doesn't cover all the newer emoji. That's not a Ubuntu problem, that's just my font being out of date.)

Segoe UI Emoji (COLR/CPAL) (fallback black/white presentation):

Twemoji (SVG in OpenType) (fallback traditional outline glyphs shown only):

(Thank you to Emojipedia.org and various Twitter users for creating strings of emoji I could copy-paste...)