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Re: [css3-align] Some questions about justify-self

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 20 Mar 2013 16:29:26 -0700
Message-ID: <CAAWBYDDhZX1gfT4rOYsrjoVE5Dff+qucJOMy=a_qQx1YRyvUJg@mail.gmail.com>
To: Christian Biesinger <cbiesinger@chromium.org>
Cc: www-style list <www-style@w3.org>, Ojan Vafai <ojan@chromium.org>
On Wed, Mar 20, 2013 at 4:24 PM, Christian Biesinger
<cbiesinger@chromium.org> wrote:
> On Wed, Mar 20, 2013 at 4:03 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>> For guidance, check out the Flexbox Baselines section
>> <http://dev.w3.org/csswg/css3-flexbox/#flex-baselines>, which is very
>> precise and explains how to handle cases when there's no appropriate
>> baseline in a particular direction.
>
> Does this mean that the synthesized baseline may have to be used also
> for justify-content: baseline?
>
> Just to make sure I understand this correctly - in this case:
> http://plexode.com/eval3/#s=aekVQXANJVQMbAx1yAXgePQMOWEZDTEpVDktWVFVKR1oORFBPVUauGwFDQlRGTUpPRhyaHz1PvwEBlZeZm52foZxToblIDk5QRUayV0ZTp0RCTQ5NUxwBiw6IslG5TL0nSlOmw1RWQx8lSlcdEO/x9nK+T8LETCaTieUCiLDMU5PZ7RabVa7Zbbdb7hcayXBISBIKZGLTgRIORSyCYRKJZXo0IysJ5FALzeoQfa/X76D4DLwA
>
> "First" and "Second" should be aligned, right?

Yes, they have vertical baselines in the obvious places, and so will
line up if you use justify-self:baseline.  (Assuming block layout,
where the justify axis is the inline axis.)

>> "stretch" should act the same way it does in Flexbox - if 'height' is
>> "auto", it sets the height such that the margin box exactly fills the
>> available space (treating auto margins as zero, unless they've already
>> been resolved).  If 'height' isn't auto, is does nothing, and acts
>> like 'start'.
>
> (Huh, that behavior surprised me. I expected flexbox to stretch an
> explicit-height item, just like flex:1; will flex an explicit-width
> item)

If that was the case, it would be impossible to get a flex item to
*not* be stretched.  It's easy to make it stretchy - just leave the
height alone, as it's "auto" by default.

> I assume that similarly, "center" will center the margin-box, and not
> the border-box or content-box.

Correct.

>>>> Note that the head/foot names are still under debate. :/  They're more
>>>> traditionally called "before" and "after", but we've been trying to
>>>> change them to a better pair.  Any suggestions would be welcome.
>>>
>>> Maybe top and bottom?
>>
>> Nope, they can't be explicitly directional, because they're
>> writing-mode specific.  That axis will be horizontal in Japanese.
>
> Hm... good point. I'm out of ideas.

So is everyone else.  ^_^

>>>>> SECTION 4.1 (justify-content)
>>>>> - Do "start" and "end" also apply to flexboxes? The text doesn't say
>>>>> that they don't, but that feels weird...
>>>>
>>>> Yes.  Why does it seem weird?  They're just the writing-mode-specific
>>>> directions, dependent on whether the element is ltr or rtl.  These are
>>>> distinct from flex-start and flex-end - a row-reverse flexbox will
>>>> have them opposite.
>>>
>>> Right, I didn't fully understand that's how they worked. Would it make
>>> sense to add a non-normative paragraph to the spec that basically says
>>> what you just said?
>>
>> The idea is that hopefully the logical directions will become common
>> enough that people understand that automatically.  ^_^  But I'll see
>> what I can do.
>
> Thanks. By the way, why does justify-content also have "left" and
> "right"? Everything else in this spec only uses logical directions
> (start/end/head/foot).

Good question.  fantasai?

~TJ
Received on Wednesday, 20 March 2013 23:30:13 GMT

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