Parse tree - help required

I am fairly new to writing HTML and need a little assistance on what is no doubt a simple matter.

I have a wab site at http://members.tripod.co.uk/draconus, written in XHTML, mostly Strict.  However, this site uses a Style Sheet which, at present, has not been validated due to lack of Parse Tree information.  What does this mean?

Received on Thursday, 27 December 2001 19:06:36 UTC