Test passes if you see a green box.
Assertion: The user agent respects the encoding of a css stylesheet declared in HTTP.
The HTML page is served as UTF-8. The CSS file encoding is established as ISO 8859-15 using only the HTTP header.
The letters shown are for debugging, should the test fail. Visible letters (left) show what was read from the CSS file; letters that appear when highlighted (right) show what they should match in the HTML.