Re: [CSS-3] outline-style: glow

On Apr 15, 2008, at 5:31 AM, Bert Bos wrote:

> On Tuesday 15 April 2008 01:03, Andrew Fedoniouk wrote:
>> I propose to add new value of 'glow' to the list of outline-style
>> values.
>>
>> Glow is an outline where color intensity (opacity of outline-color)
>> is a function of distance.
>> Usually glow is made by applying Gaussian 2d filter to pixels of some
>> image.
>>
>> Here is a sample of rendering elements with outline-style:glow;
>> http://www.terrainformatica.com/w3/outline-glow-sample.png
>
> The Backgrounds and Borders draft[1] has a 'box-shadow' property,  
> which
> can create similar effects. It's subject to 'z-index' and drawn in a
> layer of the element behind the background. That means that there is
> some control over its stacking; unlike 'outline', which is always in
> front.

What's missing from Backgrounds and Borders is a way to specify what  
PhotoShop calls "spread" (in both shadows and glows), which is a way  
to make the radius of the shadow or glow offset from the edge of the  
element, and thus larger (without being blurrier). It seems like  
Andrew's proposal does have that, if I understand it correctly.