W3C home > Mailing lists > Public > www-style@w3.org > February 2009

Re: Clarification needed for inline boxes containing block boxes

From: Andrew Fedoniouk <news@terrainformatica.com>
Date: Wed, 25 Feb 2009 20:33:48 -0800
Message-ID: <49A61BAC.4050201@terrainformatica.com>
To: Boris Zbarsky <bzbarsky@MIT.EDU>
CC: www-style list <www-style@w3.org>
Boris Zbarsky wrote:
> Consider the following testcase:
> 
> data:text/html,<!DOCTYPE html><span style="padding: 0 20px; background: 
> green; border: 2px solid red">aaa<div>bbb</div></span>
> 
> Note the lack of content inside the <span> after the <div>.
> 
> I see the following behavior on this testcase:
> 
> Gecko: no boxes generated for the <span> after the <div>.  The box
>        before the <div> gets 20px left and right padding and both
>        left and right borders.
> Opera 9.6: A box with no left border, 20px right padding and no content
>            is generated for the <span> after the <div>.  The box before
>            the <div> has no right padding or border.
> Safari 3.2.1: Generates a box before the div just like Opera, but no
>               box after the div.
> Webkit trunk from 2009-02-12: As Safari 3.2, but also generates an
>                               inline box after the <div> with borders
>                               and padding on both left and right.
> 
> IE7's behavior is pretty bizarre (e.g. the div gets the background 
> behind it too, top borders disappear, etc).  I don't have IE8 on hand to 
> test.
> 
> Modifying the testcase slightly by adding content to the <span> after 
> the <div>, like so:
> 
> data:text/html,<!DOCTYPE html><span style="padding: 0 20px; background: 
> green; border: 2px solid red">aaa<div>bbb</div>cc</span>
> 
> I see the following behavior:
> 
> Gecko: Boxes for the <span> generated both before and after the div.
>        Both have 20px left and right padding and both have all 4
>        borders.
> Opera 9.6: As before, with the text 'cc' now in the box after the <div>.
> Safari 3.2.1: As Opera for the box before the <div> and as Gecko for
>               the box after.
> Webkit trunk from 2009-02-12: As Safari 3.2.
> 
> It seems to me that section 9.2.1.1 isn't very clear, since no two UAs 
> are doing it the same way.  We should probably clarify it somehow... 
>  From my point of view, Opera's behavior here makes the most sense.  I 
> would be quite happy to implement it in Gecko.
> 
> -Boris
> 
> 

Boris, I see rendering of your first case as in attachment in
Opera 9.63 (Win).

I am not sure that this is a desirable rendering at all.

And yet. According to current HTML spec:
http://www.w3.org/TR/html401/sgml/dtd.html#inline

SPAN are not allowed to contain block elements such as
DIV. In the same way as P's cannot contain DIVs.

So I think that the behavior in this case should be
consistent with these cases:

<p style="padding: 0 20px; background: green; border: 2px solid 
red">aaa<div>bbb</div></p>

<p style="padding: 0 20px; background: green; border: 2px solid 
red">aaa<div>bbb</div>ccc</p>

At least all mentioned UA's agreed on how it should be rendered
(or parsed?).

-- 
Andrew Fedoniouk.

http://terrainformatica.com









opera-9.63.png
(image/png attachment: opera-9.63.png)

Received on Thursday, 26 February 2009 04:34:15 GMT

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