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Re: [CSS 2.1] cases that do not pass in any browser

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Mon, 02 Aug 2010 21:44:10 -0400
Message-ID: <4C57746A.9050500@mit.edu>
To: Arron Eicholz <Arron.Eicholz@microsoft.com>
CC: "public-css-testsuite@w3.org" <public-css-testsuite@w3.org>, www-style list <www-style@w3.org>
On 8/2/10 6:34 PM, Arron Eicholz wrote:
> http://test.csswg.org/source/contributors/mozilla/submitted/css2.1/selectors/first-line-floats-002.htm

This is a very interesting testcase that I wrote because the spec is 
pretty clear here but the behavior of some UA's didn't make sense.  The 
testcase is basically:

   <style>
     div { color: red; }
     div:first-line { color: green }
   </style>
   <div>
     <span>
       <span style="float: left">This should be green</span>
     </span>
   </div>

Ignoring the first-line business for the moment, the float inherits its 
color from the outer <span>.  But section 5.12.1 explicitly says that 
this markup should behave just like this markup:

   <div style="color: red">
     <div:first-line style="color: green">
       <span>
         <span style="float: left">This should be green</span>
       </span>
     </div:first-line>
   </div>

At least Opera and Webkit (I don't have IE8 on hand right this second) 
don't implement this; they make the computed color style of the <span> 
be the computed color of the <div>, while the color of the _text_ inside 
the <span> is the color specified for the first-line.  In other words, 
they produce something more like this markup:

   <div style="color: red">
     <span>
       <span style="float: left">This should be green</span>
       <div:first-line style="color: green">
       </div:first-line>
     </span>
   </div>

for purposes of style inheritance.  At least insofar as I can trust what 
getComputedStyle returns.

Gecko, on the other hand, implements what the spec says to do, which has 
the obvious consequence that the computed color of the outer <span> is 
green, whereas it's red in Webkit and Opera.

So as far as I can tell, the test is in fact correct.

 > :first-line does not apply to block-level descendants that are floats.

It's not in this case; this is testing purely style inheritance, not 
where "first-line" is applied to (which you could test by using a 
background or text-decoration or some other non-inherited style).

-Boris
Received on Tuesday, 3 August 2010 01:44:45 GMT

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