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Re: [CSS21] Is a replaced element allowed to be a table box?

From: Anton Prowse <prowse@moonhenge.net>
Date: Sun, 15 Jul 2012 01:45:57 +0200
Message-ID: <500204B5.3030701@moonhenge.net>
To: "www-style@w3.org" <www-style@w3.org>
On 15/05/2012 00:01, Anton Prowse wrote:
> 17.2 (The CSS table model) says:
>    # The following 'display' values assign table formatting rules to an
>    # arbitrary element:
>    #
>    # table [...]
>    # [...]
>    #
>    # Replaced elements with these 'display' values are treated as their
>    # given display types during layout. For example, an image that is
>    # set to 'display: table-cell' will fill the available cell space,
>    # and its dimensions might contribute towards the table sizing
>    # algorithms, as with an ordinary cell.
> So what's the deal with
> <img style="display:table">
> where presumably an anonymous table wrapper box is generated around the
> image, but no caption box is present.
> Similarly, how about
> <div style="display:table">
>      <img style="display:table-row">
> </div>
> for example?
> Does table fix-up occur?  Does the image display?  If a table formatting
> context is established in the first example, does it make sense that the
> image then displays?

 From what I can tell, Gecko takes a replaced element with display:table 
or display:table-row, gives the replaced element the used value 
display:block and generates a wrapper box with used value display:table 
or display:table-row respectively.  Then it goes and does all the table 
fix-up stuff.

This seems like a pretty useful heuristic.  Can any other implementers 
comment on what they do?

Also, I was surprised to discover that none of Gecko, Webkit and Presto 
permits a replaced box to be a table-cell box.  Instead they appear to 
wrap the replaced box in an anonymous table cell, and change the display 
type of the replaced box.  Trident seems fine with it though.

This issue is filed at https://www.w3.org/Bugs/Public/show_bug.cgi?id=17779

Anton Prowse
Received on Saturday, 14 July 2012 23:46:28 UTC

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