<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head><title>Hyphenation test</title></head> <!-- check that xml:lang beats lang --> <body xml:lang="en-us" lang="x-unknown-language"> <div style="width: 5em; hyphens: auto; font-family:sans-serif;"> supercalifragilisticexpialidocious </div> </body> </html>