RE: CSS 2: Table Cells and the "line-height" Property

The spec on initial and inherited values:

> 6.1.1 Specified values
(http://www.w3.org/TR/REC-CSS2/cascade.html#specified-value)
> User agents must first assign a specified value to a property based on the
following mechanisms (in order of precedence):
> 
> If the cascade results in a value, use it. 
> Otherwise, if the property is inherited, use the value of the parent
element, generally the computed >value. 
> Otherwise use the property's initial value. The initial value of each
property is indicated in the property's definition. 
> Since it has no parent, the root of the document tree cannot use values
from the parent element; in this case, the initial value is used if
necessary. 

My interpretation:
A property is always set. If not explicitly, then implicitly by the initial
value. 
The reason:
If the value has been changed earlier in the cascade, there MUST be a way to
set it back. If the "unset" value gets special processing then an SINGLE
setting can make it impossible to get the default behavior. In a thick
cascade, this would cause major problems.

On the image-in-a-table issue:
Ian, what CSS code would produce an image that completely fills, and
determines the size of, a table cell? That ought to be Possible, at least,
even if it's not easy.

Thanks,
Jeffrey Yasskin