an &ensp inserted in the paragraph below causes the w3c xhtml 1.1 validator service to incorrectly report an error in the column of the &ensp but at a random line in the document.
root@hrudell:~# uptime; uname
17:28:18 up 164 days, 3:49, 1 user, load average: 0.00, 0.00, 0.00
Linux