@charset
An at-rule used to define the character encoding of the CSS file. It must be at the very first line of the file and only one is allowed.
Quick example
/* Must be the very first line */
@charset "UTF-8";
@charset Browser Support
Widely available Since 2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
Safe to use without fallbacks.
2+
1.5+
4+
12+