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

Re: Clarification needed for inline boxes containing block boxes

From: David Hyatt <hyatt@apple.com>
Date: Fri, 27 Feb 2009 13:33:19 -0600
Cc: Giovanni Campagna <scampa.giovanni@gmail.com>, Boris Zbarsky <bzbarsky@mit.edu>, www-style@w3.org
Message-id: <37B96665-3176-4886-8265-DC1F29FCE253@apple.com>
To: Andrew Fedoniouk <news@terrainformatica.com>
On Feb 27, 2009, at 1:24 PM, Andrew Fedoniouk wrote:

>
> display-model (that is hypothetical attribute that used to be in  
> drafts at some point[1])
> has an absolute priority in this case and so all its immediate  
> children with
> display:block will have computed value of the display equal to  
> 'inline-block'.
>
> This is pretty old problem actually. AFAIR Gecko and IE were using  
> this way of treating display:blocks
> inside inlines from the very beginning.
>
> In general 'inline-block' value of the 'display' is superfluous. The  
> only useful case
> for the 'inline-block' is when it is used for determination of  
> actual value of "width:auto" of such block.
> In case of display:inline-block it gets resolved to width: max- 
> intrinsic ((c) D. Baron)
> and in case of  display:block inside spans it gets resolved to the  
> width: 100%-of-nearest
> block-container-width.
>
> For the observer this means that pure <div> inside <span> shall take  
> single line box as
> if that div was styled as {display:inline-block; width:100%}.
>

That's not true at all.  Margins still collapse through contiguous  
blocks, even across the empty inline boundaries.  An inline-block  
would not do this.  Inline blocks do not collapse margins with inline  
blocks on previous or subsequent lines, nor do they collapse with  
margins of contiguous blocks above and below all of their containing  
block's lines.  That is a requirement for Web compatibility here.

This is not a theoretical situation by the way.  Blocks inside inlines  
occur all the time in the real-world Web, so there is a large set of  
behaviors here that cannot be changed.

dave
(hyatt@apple.com)
Received on Friday, 27 February 2009 19:34:01 GMT

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