<IFRAME ...>
<IFRAME FRAMEBORDER="...">
<IFRAME SCROLLING="...">
MARGINWIDTH = integer
MARGINHEIGHT = integer
MARGINWIDTH and MARGINHEIGHT work much the same as their frame counterparts. MARGINWIDTH and MARGINHEIGHT control the inner margins of the frame.
MARGINWIDTH
MARGINHEIGHT
<IFRAME SRC="BeaverHabitat.html" WIDTH=250 HEIGHT=250 MARGINWIDTH=1 MARGINHEIGHT=1 > <A HREF="BeaverHabitat.html">Stuff about the Beaver</A> </IFRAME>
<IFRAME SRC="BeaverHabitat.html" WIDTH=250 HEIGHT=250 MARGINWIDTH=30 MARGINHEIGHT=30 > <A HREF="BeaverHabitat.html">Stuff about the Beaver</A> </IFRAME>
These are good attributes to avoid. It's much better to let the browsers display the frame margins as they deem best.
More information can be found at the InMotion Hosting Main Site