A form with an accept-charset attribute:
The accept-charset attribute specifies the character encodings that are to be used for the form submission.
The default value is the reserved string "UNKNOWN" (indicates that the encoding equals the encoding of the document containing the <form> element).
In HTML 4.01, the list of character encodings could be delimited by spaces or commas. In HTML5, the list must be space-separated.
|character_set||A space-separated list of one or more character encodings that
are to be used for the form submission.
In theory, any character encoding can be used, but no browser understands all of them. The more widely a character encoding is used, the better the chance that a browser will understand it.
To view all available character encodings, go to our Character sets reference.