Should HTML meta charset be lowercase or uppercase?

The value for charset is case-insensitive.

From spec.whatwg.org

The charset attribute specifies the character encoding used by the document. This is a character encoding declaration. If the attribute is present, its value must be an ASCII case-insensitive match for the string “utf-8”.

Link to full document: https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-charset

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