Re: [css3-background]Positioning of box-shadow blurs?

On Apr 30, 2010, at 3:54 PM, Sylvain Galineau <sylvaing@microsoft.com>  
wrote:

> From: www-style-request@w3.org [mailto:www-style-request@w3.org] On
>> Behalf Of Brad Kemper
>
>
>> #The fourth length is a spread radius. Positive values cause the  
>> shadow
>> to grow in all directions by the specified radius. Negative values
>> cause
>> the shadow to shrink. The shadow should not change shape when a
>> spread radius is applied: sharp corners should remain sharp  
>> ***prior to
>> the application of blur radius***.
>
> It must specify that the spread radius is added to each corner  
> radius as
> well. I shouldn't have to know what a spread radius is in order to  
> know
> what happens for those.

Boy, it's getting a bit long for what I thought was a prety simple  
concept how about this:


# The third length is a blur radius. Negative values are not allowed.  
The
blurring region should be an area the width of this value, running  
along and
centered on the edge of the shadow shape (a shape that otherwise mimics
the shape of the border box, including any border-radius, absent the
application of spread radius).  The shadow should transition from
the shadow color on the inner edge of this region, to transparent at the
outer edge of this region. If the blur radius is 0, the shadow has a  
sharp
edge, otherwise the larger the value, the more the edge of the shadow is
blurred.  The exact algorithm is not specified.

#The fourth length is a spread radius. Positive values cause the shadow
to expand in all directions by the specified radius. Negative values  
cause
the shadow to contract. If 'border-radius' is zero, then corners  
should remain sharp (not rounded) after spread radius is applied and  
prior to the application of blur radius. Otherwise, the corners of the  
new shape will have radii equal to the corresponding 'border-radius'  
value plus the spread-radius value (or minus the spread-radius value  
if it is an inset shadow, but no less than zero for the final spread  
shadow corner radius).