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Re: Drop-Shadow proposal

From: Andrew Fedoniouk <news@terrainformatica.com>
Date: Mon, 14 Sep 2009 19:59:36 -0700
Message-ID: <4AAF0318.6090709@terrainformatica.com>
To: Brad Kemper <brad.kemper@gmail.com>
CC: www-style list <www-style@w3.org>
Brad Kemper wrote:
> On Sep 14, 2009, at 8:49 AM, Brad Kemper wrote:
>>> I am not sure I understand physics here. See:
>>> 1) For shadow purposes that logo is treated as if it is transparent 
>>> (punched) so it does not cast the shadow.
>>> 2) But at the same time it is rendered as if it is non-transparent.
>> With inner shadows, wherever there is solid color, it renders as 
>> though that color is on a surface below a transparent cut-out. Because 
>> the logo is solid and opaque, you see the unobscured color of it on 
>> that lower surface. Wherever there is transparency in the original 
>> image, you get the effect of a surface floating above the lower 
>> surface, casting a shadow on whatever colors were not transparent.
>>> Seems like contradictory for me.
> This might help show what is going on a little more clearly:
> http://www.bradclicks.com/cssplay/concentric.html

Brad, am I correct that element with background-color:transparent;
placed on another one with background-color: rgba(214,0,0,0.5); will
produce the following: http://terrainformatica.com/w3/inner-shadow.png

Andrew Fedoniouk.

Received on Tuesday, 15 September 2009 03:00:02 UTC

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