WP_HTML_Processor::get_encoding( string $label ): string|null

6536	protected static function get_encoding( string $label ): ?string {6537		/*6538		 * > Remove any leading and trailing ASCII whitespace from label.6539		 */6540		$label = trim( $label, " \t\f\r\n" );6541 6542		/*6543		 * > If label is an ASCII case-insensitive match for any of the labels listed in the6544		 * > table below, then return the corresponding encoding; otherwise return failure.6545		 */6546		switch ( strtolower( $label ) ) {6547			case 'unicode-1-1-utf-8':6548			case 'unicode11utf8':6549			case 'unicode20utf8':6550			case 'utf-8':6551			case 'utf8':6552			case 'x-unicode20utf8':6553				return 'UTF-8';6554 6555			default:6556				return null;6557		}6558	}