marginheight:
The amount of space between the frame's top and bottom borders and the frame contents.
Used with Elements:
Content:
pixels; must be larger than 0
Default:
Not required
Deprecated in XHTML 1.0:
No
DTD:
XHTML 1.0 Frameset
XHTML Attributes - marginheight
By Jennifer Kyrnin, About.com Guide
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