Assertion: Setting the encoding in the XML declaration will affect the encoding of a page served as XML, but will not affect pages served as text/html.

Notes:
No encoding information is declared in the HTTP header; ISO 8859-15 is declared using the in-document XML declaration only.

The text contains the following sequence of bytes: 0xC3 0xBD 0xC3 0xA4 0xC3 0xA8. The characters serve to distinguish ISO 8859-15 from ISO 8859-1 and UTF-8.

The graphic on the lower line shows what you would expect to see if the page is encoded as ISO 8859-15. The large symbol indicates whether the characters on the two lines should be the same (equal sign) or different (not-equal sign).