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Re: [CSS21] [css3-page] page-break collapsing

From: Anton Prowse <prowse@moonhenge.net>
Date: Sun, 08 Jan 2012 12:56:30 +0100
Message-ID: <4F09846E.1030403@moonhenge.net>
To: www-style@w3.org
On 29/11/2011 17:45, fantasai wrote:
> At TPAC we resolved to clarify CSS2.1 to say that the
> 'page-break-before' and
> 'page-break-after' properties don't create a break if you're at the top
> of the
> page, where at the top of the page means no content has been placed, with
> borders not counting as content but empty zero-height blocks counting as
> content.
> Here's my proposed text:
>
> Section 13.3.3 Allowed Page Breaks
>
> # In the normal flow, page breaks can occur at the following places:
> #
> # 1. In the vertical margin between block-level boxes. [...]
>
> This, interpreted strictly, indicates that a break is allowed between
> siblings,
> but not between a parent and its first or last child. Let's clarify that by
> inserting "sibling" after "between".
>
> # Rule A: Breaking at (1) is allowed only if the 'page-break-after' and
> # 'page-break-before' properties of all the elements generating boxes that
> # meet at this margin allow it, which is when at least one of them has the
> # value 'always', 'left', or 'right', or when all of them are 'auto'.
>
> The phrase "meet at this margin" is ill-defined, so we need to define it:
>
> | A box meets at this margin if it is one of the block-level siblings on
> | either side of the margin or if it is a block-level last (for boxes
> | before the margin) or first (for boxes after the margin) child of a box
> | that also meets at this margin.
>
> We should also add
>
> | For boxes before the margin, the 'page-break-after' value is considered;
> | for boxes after the margin the 'page-break-before' value is considered.
>
> I think that should get us the behavior we want with the minimal amount of
> changes to CSS2.1 and CSS3 Paged Media. For CSS Fragmentation, we can
> consider
> rewriting the section to describe the behavior in the terms Steve used.

Fantasai, this bug is tracked at 
https://www.w3.org/Bugs/Public/show_bug.cgi?id=15448

Cheers,
Anton Prowse
http://dev.moonhenge.net
Received on Sunday, 8 January 2012 11:59:27 GMT

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