Google's Noto Fonts include, in addition to Noto Emoji, the color TTF font called Noto Color Emoji.
Can TrueType fonts have built-in colors?
Google's Noto Fonts include, in addition to Noto Emoji, the color TTF font called Noto Color Emoji.
Can TrueType fonts have built-in colors?
There is no official or standardized answer to this, but many of the big players have undertaken mostly-independent efforts to extend or replace existing type specifications to include color, and it looks like many of those efforts are because of emoji support. Some of these companies' specifications, while not accepted as standard, have already been implemented in their products.
The most concise-yet-balanced source I could find was the OpenType page on Wikipedia, which I'll summarize here: