Re: doc string for face-attribute-relative-p doesn't help

[David Kastrup]

Miles Bader <address@hidden> writes:

> Richard Stallman <address@hidden> writes:
>>       Return non-nil if face ATTRIBUTE VALUE is relative.
>>
>>     What does that mean? How is ATTRIBUTE VALUE a face? This is
>>     incomprehensible to me.
>>
>> I don't understand it either.  Can someone explain?
>
> It returns non-nil if the face attribute ATTRIBUTE is relative when it
> has value VALUE.  "Relative" means that the value doesn't _override_
> that attribute of an underlying face during face merging, but rather
> _modifies_ it.
>
> For most attributes the only value with that property is `unspecified';
> some attributes have other relative values (for instance, with :height,
> floating-point numbers are relative, as they specify a scale value
> rather than an absolute size).

Fine text for a footnote.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum