On a few pages in the YUI documentation there's mention of an which simply doesn't exist in HTML[1]. My guess is that is what was meant.
Pages that have this error include the following
* http://developer.yahoo.com/yui/container/dialog/
* http://developer.yahoo.com/yui/docs/assets/cheatsheets/dialog.pdf
Reference:
HTML 4.01...
2006-12-29 19:43:33 UTC in YUI Library
