CSS WG Blog CSS Regions Level 3 Updated

CSS Regions Level 3 Updated

The CSS Working Group has published an updated Working Draft of CSS Regions.

CSS Regions allows you to collect content in a named flow, then flow this content through boxes in a region chain.

The most important change in this new draft is the ability for region boxes to automatically size to the fragment of content they receive. This is described in a new visual formatting section which explains the processing model that enables this new behavior. In particular the auto sizing processing model allows regions to have height:auto and size themselves to accomodate content between breaks. There is a thorough example that walks through the steps, and a quick summary on www-style.

Another big change is an updated and expanded CSSOM section. It incorporates extensive feedback from specification and implementation work.

The introductory example has been reworked to include a final region that sizes to accommodate the remainder of the flow content and use grid layout to position the various regions. The code for the example has been collected in one place to improve readability.

A new section describes how multicolumn properties interact with region chains.

There are too many other changes to list here, but you can look through the change list to see the record of every difference from the last working draft.

This new draft is still a work-in-progress, but many improvements have been made since the last official publication. All of the known needed work on outstanding issues is captured in the draft with links to the latest discussions.

As always, please send feedback to the (archived) public mailing list www-style@w3.org with the spec code ([css3-regions]) and your comment topic in the subject line. (Alternatively, you can email one of the editors and ask them to forward your comment.)

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