W3C home > Mailing lists > Public > www-style@w3.org > February 2011

Re: [css3-color] [css3-background] translucent borders in Webkit

From: fantasai <fantasai.lists@inkedblade.net>
Date: Fri, 25 Feb 2011 23:51:34 -0800
Message-ID: <4D68B106.90605@inkedblade.net>
To: Brad Kemper <brad.kemper@gmail.com>
CC: Simon Fraser <smfr@me.com>, www-style list <www-style@w3.org>
On 02/25/2011 03:40 PM, Brad Kemper wrote:
> On Feb 25, 2011, at 8:36 AM, Simon Fraser<smfr@me.com>  wrote:
>> On Feb 24, 2011, at 11:24 pm, Brad Kemper wrote:
>>> I've recently noticed that when using rgba borders in webkit,
>>> in which the alpha is less than one, that the corners get double
>>> amounts of "ink" at the corners, as though each adjoining border
>>> edge overlapped the others at the corners. It is very unwanted,
>>> always, and the other browsers I checked (Firefox, IE9) don't do
>>> that, but I can't find anything in CSS3 Color or Backgrounds&
>>> Borders 3 that prohibits it. I think it should.
>> It's a bug in WebKit<https://bugs.webkit.org/show_bug.cgi?id=21835>
>> Simon
> OK, that's good. Should it be in the spec too, so there can be a test for it?
> Something like "when two adjoining borders of like color meet at a corner,
> the effect should be as a border with continuous color flowing around the
> corner, and not of overlapping lines."?

I don't think that explaining how not to do graphical joins is the job
of a CSS spec. This is obviously a bug.

If there's someone genuinely arguing that it is not a bug, then argue
that the spec says to use the specified color for the border regardless
of what graphical process underlies the border-painting, and overlapping
two regions of rgba does not result in the border having that specified
color. It is therefore nonconformant. I don't think we need an explicit
statement about this particular variant of nonconformance.

"Also, the UA must not crash while processing any pages containing CSS."

Received on Saturday, 26 February 2011 07:52:12 UTC

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