Re: [css3-flexbox] stretch apply to percentage heights WAS: Children of flex items ignoring cross-axis percentage length

On 12/08/2012 12:27 AM, Kang-Hao (Kenny) Lu wrote:
> (12/12/04 6:23), Tab Atkins Jr. wrote:
>> On Tue, Oct 9, 2012 at 11:19 AM, Ojan Vafai <> wrote:
>>> If a percentage height doesn't apply (e.g. because it's standards mode and
>>> the containing block is auto-sized), should stretch apply to that flex item?
>>> Currently in WebKit and, per the flexbox spec, it does not. I don't feel
>>> strongly either way. Just want to confirm that this is the desired behavior.
>> Okay, based on this thread and the existing browser behavior, we've
>> clarified step 11 in the layout algo to say that it looks at the
>> *computed* value of the cross-size property to tell whether it can
>> stretch or not.  Based on the errata mentioned in this thread, that
>> means that percentages which later turn into auto behavior won't get
>> stretched.
> I think we should avoid using "computed value" here because it's just
> very confusing to any reader of CSS 2.1 before the bug raised by Anton
> is resolved[1]. Why can't we just say "specified value" here, if I
> understand the change correctly? It would then not depend on reading the
> mailing list to get the intended behavior.
> I was in fact very confused and thought that this change makes a
> "height: 20%; align-self: stretch;" flex item stretch and wrote a longer
> mail against this wording.
> [1]

Well, we finally got the errata updated:

Maybe someday there'll be a CSS2.1 spec update to go with it.


Received on Monday, 22 July 2013 21:40:28 UTC