Test passes if you see green.
Assertion: [Exploratory test] Setting the encoding in the XML declaration will not affect the encoding of a page served as text/html.
The only character encoding declaration for this HTML file is in the XML declaration, which declares the encoding to be ISO 8859-15.
The test contains a div with a class name that contains the following sequence of bytes: 0xC3 0xBD 0xC3 0xA4 0xC3 0xA8. These represent different sequences of characters in ISO 8859-15, ISO 8859-1 and UTF-8. The external, UTF-8-encoded stylesheet contains a selector
.test div.ÃœÃ€Ãš. This matches the sequence of bytes above when they are interpreted as ISO 8859-15. If the class name matches the selector then the box will turn green.