In the document Objects, <http://www.w3.org/TR/html401/appendix/changes.html#h-A.1.1.9> Images, and Applets:
Is: Added a note that user agents must provide different mechanisms for accessing the "longdesc" URI (of IMG) and the "src" URI (of A) when an IMG is part of the content of an A element. Should be: Added a note that user agents must provide different mechanisms for accessing the "longdesc" URI (of IMG) and the "href" URI (of A) when an IMG is part of the content of an A element.