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No encoding information is declared in the HTTP header or inside the document, other than in the BOM. The text of a class name in the test contains the following sequence of bytes: 0xC3 0xc0 0x53 0xc1 0xC3 0xc0 0xAC 0xc20 0xC3 0xc0 0x61 0xc1. The external, UTF-8-encoded stylesheet contains a selector with a sequence of characters that will only match the class name in the HTML if the page is read as UTF-16BE.