Tidy vs. <table height="">

Tidy is not flagging the height attribute in the <table> element as an
error.
 
I thought, height was not a valid attribute of <table> and was only an IE
and NN extension.
 
I'm using XHTML Transitional for the DTD.
 
Thanks.

Rick Roth 
Web Developer 
Rivio, Inc. 
rickr@rivio.com <outbind://7/rickr@rivio.com>