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topics start end before after align
Spec_tags : css3-flexbox, css3-align
Owner_tags : fantasai
Status_tags : Closed
Added_dt : 2012-05-16
Action : Discuss and resolve.
Issue_urls : http://lists.w3.org/Archives/Public/www-style/2012May/0556.html
Proposal_urls :
Agenda_urls : #If this is part of an ordered series of related topics, e.g. LC issues, use this to link to the supertopic agenda
Further discussion revealed that, not only does Flexbox have the problem that its justify/align-* properties aren't necessarily tied to the logical directions (which makes the start/end/before/after keywords somewhat awkward). So, some favored the start/start/end/end solution better. Even worse, though, the flexbox's direction can be such that the "main-start" of the flexbox (flex-direction-relative) is actually the "logical-end" side of the Flexbox, so using start/end at all can be confusing.
As such, it was resolved to introduce special flex-direction-relative keywords for flexbox. The properties in question now accept flex-start/end as keywords.
The Box Alignment spec will define that flex-start/end map to start/head or end/foot on non-flexboxes, and define start/end/head/foot as properly logical.
The alignment properties are divided into two dimensions, one for each flow-relative dimension. In order to have terms for all four sides of a box, the terminology used in each dimension is different: the inline dimension uses start/end, while the stacking dimension uses before/after. (But see open issue on renaming before/after.) Right now the layout specs proposing new alignment properties use start/end keywords in both dimensions.
Note: Flexbox will be the first spec to go to CR with logical keywords.
Should alignment properties use flow-relative terms, or use start/end in both dimensions?
The proposal is to have the Box Alignment proposal's '-align' properties, which align in the stacking dimension, to use block-relative directions, not start/end (which are the inline-relative terms).