W3C home > Mailing lists > Public > www-style@w3.org > September 2009

Re: Border-Images and 'round': CSS Backgrounds and Borders Module Level 3

From: Brad Kemper <brad.kemper@gmail.com>
Date: Mon, 28 Sep 2009 10:27:47 -0700
Cc: www-style list <www-style@w3.org>
Message-Id: <32AA6866-7385-4B3F-BAA4-19DC2514FD1B@gmail.com>
To: "Tab Atkins Jr." <jackalmage@gmail.com>

On Sep 28, 2009, at 10:05 AM, Tab Atkins Jr. wrote:

>
>> 2) when the "repeat" keyword is used with border-image, that the  
>> left-over
>> space be distributed between and around the tiles, instead of just  
>> on the
>> ends of the row of abutting tiles.
>
> I don't like this.  I think the current behavior makes sense and is
> most closely analogous to 'repeat' in backgrounds.

Backgrounds don't need to be symmetrical the way border image sides  
do. Background images can get clipped in ways that border image tiles  
do not. So the "create a row of tiles and then add space to the ends  
to center them" idea is not that close to what background images do.

I don't see the need to be slavishly consistent with how backgrounds  
tile, just because of the re-use of the same keyword. Is there any  
other advantage, other than just "that's closer to how background  
tiling works"? Or are you saying there is some advantage because you  
could get the background-image tiles to line up with the border-image  
tiles?

>> 3) that the wording of the "position" step of the drawing process be
>> changed, so that it doesn't talk about how the tiles are aligned  
>> (centered,
>> left, etc.), since "stretch" and "round" would not produce  
>> different results
>> based on alignment, and neither would "repeat" if #2, above, is  
>> adopted.
>
> Actually, the current wording makes sense, since the tiling doesn't
> occur until later.  'stretch' could conceivably be left-aligned (it
> doesn't matter at all), but 'round' *would* produce a different visual
> effect if the image was centered before tiling - what if you had an
> even number of copies?

I don't know what you mean. In what space is the image centered before  
tiling? Doesn't "round" cause the image to be resized in one dimension  
until it fits perfectly and leaves no left over space? How does odd or  
even number matter? Am I completely misunderstanding what "round" is  
supposed to do?

> And, since I prefer keeping 'repeat' as it is,
> it needs to be centered as well.
>
>> 4) if #2, above, is not adopted, then a new keyword, "distribute",  
>> be added
>> as a fourth choice, and that the wording of the "position" step  
>> only mention
>> alignment for "repeat", as it would be the only keyword for which it
>> mattered.
>
> I support this as a useful visual effect, giving you a uniform
> distribution of the image without any scaling.
>
> ~TJ
Received on Monday, 28 September 2009 17:28:33 GMT

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