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RE: possible bug in t100801-c42-ibx-ht-00-d-a.xht

From: Peter Sorotokin <psorotok@adobe.com>
Date: Mon, 25 Sep 2006 00:49:51 -0700
Message-ID: <40CE68F1F8CAFB48B998C328517EA92AFCB18B@namail2.corp.adobe.com>
To: <public-css-testsuite@w3.org>


It does define the height of the *line box*, but borders are supposed to
be around the element's *content area* (if there are no padding), not
the line box (so that, for example, when line-height property is
modified, the position of the borders does not change relative to the
text). It seems that this is how it is implemented in Mozilla and Opera
(but not IE) and I think there are tests for that in the suite. The CSS
spec could have been more explicit on how that works. 

The height of the content area is explicitly undefined in section 10.6.1
(as you pointed out). What browsers seem to do is to define the content
area height (and position) being the same as *default* line height
(which is quite reasonable). Following the spec *suggestions* and
defining content area height in terms of the em box of the font or
ascender/descender (which is the same thing for Ahem) does not seem to
work for this test.


-----Original Message-----
From: public-css-testsuite-request@w3.org
[mailto:public-css-testsuite-request@w3.org] On Behalf Of L. David Baron
Sent: Monday, September 25, 2006 12:25 AM
To: public-css-testsuite@w3.org
Subject: Re: possible bug in t100801-c42-ibx-ht-00-d-a.xht

On Monday 2006-09-25 00:09 -0700, Peter Sorotokin wrote:
> Correct me if I am wrong, but CSS 2.1 does not define the height of
> line box and thus does not define the position of the horizontal
> of inline elements. Yet, this test

It does define the height of the line box (10.8 and 9.4.2).

It's true that the visual height of inline elements is defined in a
slightly vague way -- 10.6.1 allows something unspecified based on the
font -- but I think the Ahem font has metrics such that every reasonable
thing based on the font should lead to the same result.  Perhaps the
spec should limit the options to a set of choices.


L. David Baron                                <URL: http://dbaron.org/ >
           Technical Lead, Layout & CSS, Mozilla Corporation
Received on Monday, 25 September 2006 07:50:45 UTC

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