We're talking about extensions to HTML 2.0, which has no such attribute.
Regards,
-- Terry Allen (terry@ora.com) O'Reilly & Associates, Inc. Editor, Digital Media Group 101 Morris St. Sebastopol, Calif., 95472A Davenport Group sponsor. For information on the Davenport Group see ftp://ftp.ora.com/pub/davenport/README.html or http://www.ora.com/davenport/README.html
Current HTML 2.0 spec: ftp://ds.internic.net/internet-drafts/draft-ietf-html-spec-04.txt