W3C home > Mailing lists > Public > www-style@w3.org > February 2014

Re: [css3-background] background-clip value that applies for the background color property

From: Stewart Brodie <sbrodie@espial.com>
Date: Mon, 17 Feb 2014 15:56:11 +0000
To: <www-style@w3.org>
Message-ID: <gemini.n15dln00nzylv00mj.sbrodie@espial.com>
Simon Sapin <simon.sapin@exyr.org> wrote:

> On 17/02/2014 13:59, Stewart Brodie wrote:
> >
> > Section 3.2, "Base Color: the background-color property" says at the
> > end:
> >
> > "The background color is clipped according to background-clip’value
> > associated with the bottom-most background image."
> >
> > Does it really mean that or should it say the "bottom-most image layer"?
> > The rest of the text appears to always be careful to say "image layer"
> > when it means that, but this one is different.
> >
> > i.e. what background-clip value applies to the background-color here:
> >
> >    background-color: black;
> >    background-clip: border-box, content-box, padding-box;
> >    background-image: url(example-1.png), none
> >
> > The current text implies that it should be border-box.  I think it is
> > trying to say that it should be content-box.
> >
> > Which is correct?
> It's content-box.  Are you interpreting a 'none' value in
> 'background-image' as an "layer" but not as an "image"? I don't think that
> difference is intended.

OK, it's fine that it works like that, but the spec is ambiguous. Everywhere
else where it means "image layer", it says "image layer". It doesn't use
that term here, so it looks like it might be trying to say something else.

Can the spec be fixed to not use the "bottom-most background image" when it
means "bottom-most image layer"?

> This is consistent with how the syntax of the 'background' shorthand only
> accepts a color in <final-bg-layer>.

I'm not worried about the background shorthand and I don't see how it
affects this, although I can see having no non-none values in
background-image would leave you unable to change the clipping that applies
to background-color clip.

Stewart Brodie
Senior Software Engineer
Team Leader ANT Galio Browser
Espial UK
Received on Monday, 17 February 2014 15:56:50 UTC

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