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Re: [css3-background] proposed box-shadow syntax

From: Alan Gresley <alan@css-class.com>
Date: Sun, 11 May 2008 12:23:39 +1000
Message-ID: <482658AB.1000807@css-class.com>
To: Brad Kemper <brkemper@comcast.net>
CC: Eli Morris-Heft <dai@doublefishstudios.com>, "www-style@w3.org list" <www-style@w3.org>

Brad Kemper wrote:
> 
> On May 10, 2008, at 10:36 AM, Brad Kemper wrote:
> 
>>> box-shadow: 6px 6px 6px green;  /* 6px blur, not supporting spread */
>>> box-shadow: 6px 6px 2px green; /* two pixel blur and spread */
> 
> Oh yeah, and...
> 
> Neither one of those 2 examples would show any spread. The third 
> measurement would always be blur. Spread would be the fourth, which you 
> don't have there. So I don't know why you would want two different blur 
> values based on spread support, if you are not specifying spread.


I was seeing that for the implementation that supported spread I would 
serve up a second shadow showing greater blur. So in my CSS I would have.

box-shadow: 6px green;
box-shadow: 6px 6px 2px green, 8px 8px 10px blue;


> It looks like you are saying that the 2px would be used for both blur 
> and spread, but that is not what I proposed. If no spread is specified, 
> then it would default to zero, and look the same as with the current spec.


Now I know that my CSS wouldn't work since the spread would be '0'


I getting confused since I can find this from the 3rd Dec 2007.

http://dev.w3.org/cvsweb/csswg/css3-background/Overview.html?rev=1.9


Which has only 'background-shadow' and 'border-shadow' and the latest 
from the 4th Apr 2008.

http://dev.w3.org/cvsweb/csswg/css3-background/Overview.html?rev=1.20


Which only has box-shadow??????


So part of my argument is based on shifting ground. :-/


I add two extra text cases on what is currently implemented by webkit.

http://css-class.com/test/css/shadows/box-shadow-blur-light.htm


and one that shows a glows.

http://css-class.com/test/css/shadows/box-shadow-blur-dark.htm


This makes me realize that a shadows happens in the day (plenty of 
light) and a glow happens at night like the light from a neon sign. Both 
achieved with the box-shadow property, but the later has no light to 
case any shadows. A bit weird. :-)


I will get back to you regarding the spread value. Do you mean a shadow 
that become larger or smaller?


I will provide a random link.

http://en.wikipedia.org/wiki/Shadow


I very interested in the darker parts of the shadow (umbra) which show 
depth of field.

http://en.wikipedia.org/wiki/Umbra


This is seen with a telegraph/electricity pole.


Alan
Received on Sunday, 11 May 2008 02:24:31 GMT

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