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Re: [CSS3 Paged Media] Page collapsing

From: Anne van Kesteren <annevk@opera.com>
Date: Thu, 14 Sep 2006 09:38:32 +0200
To: "Grant, Melinda" <melinda.grant@hp.com>, www-style@w3.org
Cc: w3c-css-wg@w3.org
Message-ID: <op.tfux6id664w2qv@id-c0020.oslo.opera.com>

On Thu, 14 Sep 2006 04:39:06 +0200, Grant, Melinda <melinda.grant@hp.com>  
> The CSS Paged Media specification
> (http://www.w3.org/TR/2004/CR-css3-page-20040225/) is currently unclear
> as to what should happen when multiple page-break-* properties
> accumulate.

You mean that it doesn't say what you want? :-)

> The spec is clear that a :left or :right pseudo-class can
> require that a blank page or surface is generated.
> For example:
> <p>This is a paragraph on page 1.</p>
> <div style="page-break-before">
>      <div style="page-break-before">
>          The first div causes a page break; does the second div cause
> another page break, putting this content on page 3, or are the page
> breaks collapsed into a single page break so that this is printed on
> page 2?</div>
> </div>

What if I had |div::before { content:'Test.' }| specified in some style  
sheet? I assume that in that case they would not collapse? Also, what  
happens for cases like:

   <div style="page-break-before:always">
     <div style="page-break-before:always">

If such collapsing rules are defined they need to be clear. For your first  
example you wouldn't get an empty page for example if the the outermost  
<div> has some kind of background image or other decoration.

> Different implementations behave differently, as might be expected.  It
> seems that most implementations collapse pages.  Notably Opera's does
> not.  I propose that the spec be made explicit to require that
> page-break properties collapse such that no empty pages or surfaces are
> generated except for one when needed to get to the next right- or
> left-facing page.  Authors can use other means to create blank pages.
> This would make printed results more interoperable.

I'm fine with changing the specification as long as the collapsing  
algorithm is clear.

Anne van Kesteren
Received on Thursday, 14 September 2006 07:38:49 UTC

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