Re: Layered presentation on a single element

> <h1>This text will not display. 100x100 foo.gif will show in its place</h1>

I don't understand the example.  You appear to be replacing document content
with non-content.  Material generated by style sheets should not carry the
primary information content of a web page.

This looks like a keyword stuffing tactic which will get pages disqualified
by search engines.