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

Color-Font-Support_macOS-El-Capitan_Browsers.md

Chrome:

Version: 62.0.3202.94 (Official Build) (64-bit) User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) 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 (Macintosh; Intel Mac OS X 10.11; rv:57.0) Gecko/20100101 Firefox/57.0

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Safari:

Version 9.0.3 (11601.4.4) User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/601.4.4 (KHTML, like Gecko) Version/9.0.3 Safari/601.4.4

macOS El Capitan (10.11.3) is unable to install Noto Color Emoji locally. (I can't personally test a higher/more-recent version of macOS at this time.)

For issues seen in browser consoles, see: This comment (main/Linux) and This comment (unique to Windows).

See also these gists for more browser color font support tests, but on other operating systems: Gist for Ubuntu. Gist for Windows 10

Unique to macOS, Chrome 62 had an error trying to load Noto Color Emoji: