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Re: [css-regions] Expose info about line breaks, overflow to JS

From: Mihai Maerean <mmaerean@adobe.com>
Date: Wed, 29 Jan 2014 16:31:43 +0000
To: Johannes Wilm <johannes@fiduswriter.org>, www-style list <www-style@w3.org>
Message-ID: <CF0EF741.10BC3%mmaerean@adobe.com>
I'm bringing up a sample html content to the discussion about doing
fragmentation using this method to show some of its limitations.

If you have a div that has styling that you don't want applied to each of
its words (padding, margin, box-shadow) and this div gets fragmented, it's
hard if not impossible to fragment that div correctly.
For the margins (that a paragraph has), the JS code could simulate the
margin collapsing of the fragments with the fragment containers (to be
spec compliant and to look good), but for properties like box-shadow I
don't see how that could be implemented in JS.

Large parts of the css-break spec are going to be ignored by such an

Mihai Maerean

From:  Johannes Wilm <johannes@fiduswriter.org>
Date:  Wednesday 29 January 2014 17:20
To:  "www-style@w3.org" <www-style@w3.org>
Subject:  [css-regions] Expose info about line breaks, overflow to JS
Resent-From:  "www-style@w3.org" <www-style@w3.org>
Resent-Date:  Wednesday 29 January 2014 17:21

>Hey,given that there is still so much disagreement with CSS Regions on
>the part of Opera, Firefox and lately also from Chrome, based on supposed
>performance issues, it was mentioned that the rendering engines,
> according to the view of some, should just be the basis of applications
>that can then take care of fragmentation.
>In order to be able to do that half-way efficiently, it would be an
>advantage for the Javascript to know where fragmentation occurs: 1. line
>breaks and 2. how much of a node could be rendered without causing
>With this info (which the browser should have anyway) available in
>Javascript it should be a lot less time spent on trying to recreate what
>happens when creating the javascript.
>Johannes Wilm
>Fidus Writer
>http://www.fiduswriter.com <http://www.fiduswriter.com/>
Received on Wednesday, 29 January 2014 16:32:16 UTC

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