RE: [css3-flexbox] cross-size of flexbox lines

± From: Morten Stenshorne [mailto:mstensho@opera.com] 
± Sent: Thursday, May 03, 2012 12:29 AM
± 
± If the line in non-wrappable flexboxes no longer follows the flexbox's cross size 
± strictly, I think flex-line-pack should apply to non-wrappable flexboxes as well, 
± since there may now be negative extra space to distribute (and also positive 
± extra space if the note referred above is removed, to eliminate even more 
± inconsistency).

It may be a good idea -- but only if nowrap flexbox gets the same behavior as single-line wrap, namely the ability to stretch the line outside flexbox and align content into overflow.

I would prefer to keep nowrap behavior as is and add a special case to line sizing in wrap case.

± Which brings me to the following question: Why isn't negative line stretching 
± allowed? Negative item stretching is allowed (and it makes a lot of sense). 
± Shouldn't there be a way to make the sole line in a flexbox fit the flexbox's 
± cross size perfectly (by stretching or shrinking the line)? Isn't that use case 
± #1?

Negative cross-size stretching works for items, but only if their cross-size is 'auto'.

For lines, negative shrinking would mean that content will overlap across lines and I can't think of any situation when it would be desirable...

Alex