Click on the link. Test passes if you see a green square.
Assertion: A page with no encoding declarations, but with a UTF-16 little-endian BOM will be recognized as UTF-16.
The target page is served with no character encoding declarations in HTTP or inside the document other than a UTF-16 little-endian BOM.
The test on the target page contains a div with a class name that contains a sequence of bytes that only reads as ÃœÃ€Ãš if the character encoding is UTF-16LE. The external, UTF-8-encoded stylesheet contains a selector
.test div.ÃœÃ€Ãš. This only matches the class name in the html if sequence of bytes in the html page is interpreted as UTF-16LE. If the class name matches the selector then the top box will turn green.