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Re: [css21] Clarifications on errata item s.11.1.1b (overflow on tables)

From: Simon Pieters <simonp@opera.com>
Date: Mon, 11 Nov 2013 20:18:06 +0800
To: "www-style@w3.org" <www-style@w3.org>
Message-ID: <op.w6dif9cjidj3kv@simons-macbook-pro.local>
On Sun, 10 Nov 2013 17:38:27 +0800, Simon Pieters <simonp@opera.com> wrote:

> I'm looking at testing this errata item for CSS 2.1:

Now done, assuming what the minutes say applies, and that when the table  
is the root element or HTML <body>, overflow applies only to the viewport  
(i.e. not the table box). I think the errata item needs to be updated to  
reflect those two points.



> [[
> [2013-07-15] In 11.1.1 “Overflow: the 'overflow' property,” change the  
> definition of 'scroll' and 'auto':
> scroll
> This value indicates that the content is clipped and that if the user  
> agent uses a scrolling mechanism that is visible on the screen (such as  
> a scroll bar or a panner), that mechanism should be displayed for a box  
> whether or not any of its content is clipped. This avoids any problem  
> with scrollbars appearing and disappearing in a dynamic environment.  
> When this value is specified and the target medium is 'print',  
> overflowing content may be printed. When used on table boxes, this value  
> has the same meaning as 'visible'.
> auto
> The behavior of the 'auto' value is user agent-dependent, but should  
> cause a scrolling mechanism to be provided for overflowing boxes. When  
> used on table boxes, this value has the same meaning as 'visible'.
> (See CSS WG minutes 2012-08-08.)
> ]]
> http://www.w3.org/Style/css2-updates/REC-CSS2-20110607-errata.html#s.11.1.1b
> The minutes say
> [[
>     - RESOLVED: Errata CSS2.1 to say that 'overflow' on a table element
>                 applies to the table box (not table wrapper box); and
>                 that values other than 'hidden' are treated as 'visible'.
> ]]
> http://lists.w3.org/Archives/Public/www-style/2012Aug/0298.html
> The errata don't seem to cover the part "'overflow' on a table element  
> applies to the table box (not table wrapper box)", as far as I can tell.
> Another issue that this change introduces is: what should happen when  
> the root element is a table? Should overflow apply to the viewport, or  
> the table box, or both? Similarly when HTML <body> is display:table.
> For reference, the spec currently says about overflow on root/<body>:
> [[
> UAs must apply the 'overflow' property set on the root element to the  
> viewport. When the root element is an HTML "HTML" element or an XHTML  
> "html" element, and that element has an HTML "BODY" element or an XHTML  
> "body" element as a child, user agents must instead apply the 'overflow'  
> property from the first such child element to the viewport, if the value  
> on the root element is 'visible'. The 'visible' value when used for the  
> viewport must be interpreted as 'auto'. The element from which the value  
> is propagated must have a used value for 'overflow' of 'visible'.
> ]]
> http://www.w3.org/TR/2011/REC-CSS2-20110607/visufx.html#propdef-overflow

Simon Pieters
Opera Software
Received on Monday, 11 November 2013 12:18:56 UTC

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