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[RC6] *-offset-001 and *-offset-003 mislead about containing block: containing block is not a CSS box

From: Gérard Talbot <css21testsuite@gtalbot.org>
Date: Sat, 12 Nov 2011 16:26:27 -0800
Message-ID: <ababa59c8532fe757efdb822bf08f1bd.squirrel@gtalbot.org>
To: "Arron Eicholz" <arron.eicholz@microsoft.com>
Cc: "Public CSS test suite mailing list" <public-css-testsuite@w3.org>
Arron,

[RC6]
http://test.csswg.org/suites/css2.1/20110323/html4/top-offset-003.htm

[nightly-unstable]
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/top-offset-003.htm


[RC6]
http://test.csswg.org/suites/css2.1/20110323/html4/bottom-offset-001.htm

[nightly-unstable]
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/bottom-offset-001.htm


[RC6]
http://test.csswg.org/suites/css2.1/20110323/html4/bottom-offset-003.htm


[nightly-unstable]
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/bottom-offset-003.htm


[RC6]
http://test.csswg.org/suites/css2.1/20110323/html4/left-offset-003.htm


[nightly-unstable]
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/left-offset-003.htm


[RC6]
http://test.csswg.org/suites/css2.1/20110323/html4/right-offset-001.htm


[nightly-unstable]
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/right-offset-001.htm


[RC6]
http://test.csswg.org/suites/css2.1/20110323/html4/right-offset-003.htm

[nightly-unstable]
http://test.csswg.org/suites/css2.1/nightly-unstable/html4/right-offset-003.htm


The above testcases (in their respective <meta> text assert) are
creating a confusion with regards to what is a containing block. A
containing block is just a rectangle used to position other boxes which
are positioned (that is, having 'position' set to something other than
'static') and with a non-zero and non-auto top|left|bottom|right offset.

A containing block is not a CSS box: so, it does not have a padding edge
nor a content edge.
A containing block is a rectangle: so, it has a left edge, a right edge,
a bottom edge, a top edge, a width and a height. Nothing else.

What those testcases' text assert could do better is defining what
establishes, defines the containing block in each of those testcases and
then link to or relate such definition to the offset. Eg.

<meta name="assert" content="The 'top' property, for absolute
positioning, specifies the offset of the element in relation to the
containing block's top edge. The containing block of an absolutely
positioned element is formed by the padding box of its nearest (closest)
positioned ancestor element.">
coming from
http://test.csswg.org/suites/css2.1/20110323/html4/top-offset-001.htm

regards, Gérard
-- 
Contributions to the CSS 2.1 test suite:
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CSS 2.1 Test suite RC6, March 23rd 2011:
http://test.csswg.org/suites/css2.1/20110323/html4/toc.html

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Received on Sunday, 13 November 2011 00:27:02 GMT

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