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Re: [RC6] containing-block-011, 013, 015 incorrect

From: Gérard Talbot <css21testsuite@gtalbot.org>
Date: Thu, 8 Mar 2012 01:07:16 -0500
Message-ID: <6c000418c83f94075322880f4817f5ba.squirrel@ed-sh-cp3.entirelydigital.com>
To: "Arron Eicholz" <arron.eicholz@microsoft.com>
Cc: "Public CSS test suite mailing list" <public-css-testsuite@w3.org>

Le Jeu 8 mars 2012 0:50, "Gérard Talbot" a écrit :
>
> Le Mer 7 mars 2012 23:42, "Gérard Talbot" a écrit :
>> Arron,
>>
>> [RC6]
>> http://test.csswg.org/suites/css2.1/20110323/html4/containing-block-011.htm
>>
>> [nightly-unstable]
>> http://test.csswg.org/suites/css2.1/nightly-unstable/html4/containing-block-011.htm
>>
>> [RC6]
>> http://test.csswg.org/suites/css2.1/20110323/html4/containing-block-013.htm
>>
>> [nightly-unstable]
>> http://test.csswg.org/suites/css2.1/nightly-unstable/html4/containing-block-013.htm
>>
>> [RC6]
>> http://test.csswg.org/suites/css2.1/20110323/html4/containing-block-015.htm
>>
>> [nightly-unstable]
>> http://test.csswg.org/suites/css2.1/nightly-unstable/html4/containing-block-015.htm
>>
>>
>> I think all these 3 tests are not testing what they wanted to test
>> originally, initially.
>>
>> The innermost span is absolutely positioned in all 3 tests. So, we
>> start
>> from here...
>>
>> "
>> 4. If the element has 'position: absolute', the containing block is
>> established by the nearest ancestor with a 'position' of 'absolute',
>> 'relative' or 'fixed', in the following way:
>>
>>   1. In the case that the ancestor is an inline element, the
>> containing
>> block is the bounding box around the padding boxes of the first and
>> the last inline boxes generated for that element.
>> "
>> http://www.w3.org/TR/CSS21/visudet.html#containing-block-details
>>
>> The problem is that the wrapping span (the parent of the inner span),
>> which is span#span1, is not positioned, therefore can not be
>> considered
>> a positioned ancestor. So, the nearest positioned ancestor in all 3
>> tests is the wrapping div which is relatively positioned (in 011),
>> absolutely positioned (in 013) and fixed-positioned (in 015). So, in
>> all
>> 3 tests, bullet 4, sub-bullet 2 is applied, is actually really tested.
>>
>>
>> The predicted rendered layout of the 3 tests are correct
>
> Duh! I am confused myself now! If the containing block was the wrapping
> div, then we would see the blue square at upper-left corner, not at
> lower-right corner.

Okay. With top: auto and left: auto, the blue square is accordingly at
the lower-right corner.




With top: 0px; and left: 0px; we can see and we should see the
upper-left corner of the containing block and it is NOT the span#span1
but the wrapping div. So, those 3 tests are, as I initially thought,
incorrect.

> For sure, the innermost span's nearest positioned ancestor is the
> wrapping div, in which case, its padding box should establish/should
> form the containing block.

Gérard
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Received on Thursday, 8 March 2012 06:07:45 GMT

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