What does 低亮度按钮 look like on Facebook?

On Facebook it is the design shipped in 16.0, shown above at full size. Older revisions are listed beneath it.

When did Facebook add 低亮度按钮?

Facebook first drew 低亮度按钮 in 2.0, released 2017年2月20日.

Meta Platforms, Inc. has shipped 12 versions of 低亮度按钮. Each is dated, so you can see when the design changed.

Facebook

Meta Platforms, Inc. has drawn 低亮度按钮 12 times. Every revision Facebook has shipped is below, newest first.

What does 低亮度按钮 look like on Facebook?: On Facebook it is the design shipped in 16.0, shown above at full size. Older revisions are listed beneath it.
When did Facebook add 低亮度按钮?: Facebook first drew 低亮度按钮 in 2.0, released 2017年2月20日.
How many times has Facebook redrawn 低亮度按钮?: Meta Platforms, Inc. has shipped 12 versions of 低亮度按钮. Each is dated, so you can see when the design changed.

Facebook artwork for this emoji spans 2017 to 2025.