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@charset

The @charset CSS at-rule specifies the character encoding used in the style sheet. It must be the first element in the style sheet and not be preceded by any character; as it is not a nested statement, it cannot be used inside conditional group at-rules. If several @charset at-rules are defined, only the first one is used, and it cannot be used inside a style attribute on an HTML element or inside the <style> element where the character set of the HTML page is relevant.

@charset "utf-8";

This at-rule is useful when using non-ASCII characters in some CSS properties, like content.

As there are several ways to define the character encoding of a style sheet, the browser will try the following methods in the following order (and stop as soon as one yields a result) :

The value of the Unicode byte-order character placed at the beginning of the file.
The value given by the charset attribute of the Content-Type: HTTP header or the equivalent in the protocol used to serve the style sheet.
The @charset CSS at-rule.
Use the character encoding defined by the referring document: the charset attribute of the <link> element. This method is obsolete and should not be used.
Assume that the document is UTF-8

Syntax

@charset "UTF-8";
@charset "iso-8859-15";

Formal syntax

@charset "<charset>";

charset: A <string> denoting the character encoding to be used. It must be the name of a web-safe character encoding defined in the IANA-registry, and must be double-quoted, following exactly one space character (U+0020), and immediately terminated with a semicolon. If several names are associated with an encoding, only the one marked with preferred must be used.

Examples

Valid and invalid charset declarations

@charset "UTF-8"; /* Set the encoding of the style sheet to Unicode UTF-8 */
@charset 'iso-8859-15'; /* Invalid, wrong quoting style used */
@charset  "UTF-8"; /* Invalid, more than one space */
 @charset "UTF-8"; /* Invalid, there is a character (a space) before the at-rule */
@charset UTF-8; /* Invalid, without ' or ", the charset is not a CSS <string> */

Specifications

Specification
Cascading Style Sheets Level 2 Revision 2 (CSS 2.2) Specification # charset①

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`@charset`	2	12	1.5 Firefox 1 supported an invalid syntax where the character encoding is not between single or double quotes.	5.5 From Internet Explorer 5.5 to IE 7 (inclusive), Internet Explorer supported an invalid syntax where the character encoding is not between single or double quotes.	9	4	2	18	4	10.1	4	1.0