HTML Attributes for <IFRAME ...>
WIDTH ="width expression"
HEIGHT ="height expression"

HEIGHT and WIDTH indicate the dimensions of the inline frame.

This Code Makes This 
<IFRAME SRC="hello.html" WIDTH=250 HEIGHT=100>
If you can see this, your browser doesn't 
understand IFRAME. However, we'll still 
<A HREF="hello.html">link</A> 
you to the file.
</IFRAME>

We have not found any official reference that HEIGHT and WIDTH are required attributes. MSIE's default values are HEIGHT and WIDTH.

<IFRAME NAME="..."> >