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Re: [CSS21] Nested floats and zero-height margin box

From: Øyvind Stenhaug <oyvinds@opera.com>
Date: Tue, 21 Feb 2012 18:50:19 +0100
To: "W3C www-style mailing list" <www-style@w3.org>, Gérard Talbot <www-style@gtalbot.org>, Øyvind Stenhaug <oyvinds@opera.com>
Message-ID: <op.v91ih5pkbunlto@oyvinds-desktop>
On Tue, 21 Feb 2012 18:45:57 +0100, Øyvind Stenhaug <oyvinds@opera.com>  
wrote:

> On Sat, 18 Feb 2012 04:11:10 +0100, Gérard Talbot  
> <www-style@gtalbot.org> wrote:
>
>>
>> Le Ven 17 février 2012 14:56, "Gérard Talbot" a écrit :
>>> Hello,
>>>
>>> I am working on the following tests:
>>>
>>> http://www.gtalbot.org/BrowserBugsSection/css21testsuite/float-non-replaced-width-013.html
>>>
>>> http://www.gtalbot.org/BrowserBugsSection/css21testsuite/float-non-replaced-width-014.html
>>>
>>> http://www.gtalbot.org/BrowserBugsSection/css21testsuite/float-non-replaced-width-015.html
>>>
>>> http://www.gtalbot.org/BrowserBugsSection/css21testsuite/float-non-replaced-width-016.html
>>>
>>> 1- Are those tests correct? If no, please explain a bit, preferably by
>>> quoting the relevant chunks of the spec.
>>
>> A float establishes a new block formatting context for its children (as
>> stated in section 9.4.1). And the right outer edge of a left-floating  
>> box
>> may not be to the right of the left outer edge of any right-floating box
>> that is next to it. Analogous rules hold for right-floating elements.
>> So, the parent float should be as wide as the sum of the width of its
>> children.
>>
>> Consider this issue as SOLVED
>
> I don't think the spec covers these adequately.
>
> First of all, the outermost floats here are all auto-width, in which
> case "CSS 2.1 does not define the exact algorithm" for finding preferred
> width and preferred minimum width.
>
> Second of all, what does it mean for a right-floating box to be "next
> to" a left-floating box? This doesn't seem to be properly defined.
> Perhaps it should be similar to the case of lineboxes "next to" floats,
> where floats with zero outer height are not supposed to shorten
> lineboxes. Then, for e.g. float-non-replaced-width-013 it would be

Sorry, this was supposed to say "float-non-replaced-width-014".

> perfectly fine to put #floated-left-child in the top left and
> #floated-right-child "below" it - #floated-right-child would still be
> "as high as possible".

-- 
Øyvind Stenhaug
Core Norway, Opera Software ASA
Received on Tuesday, 21 February 2012 17:50:59 GMT

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