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Re: [css3-flexbox] Should "overflow: [scroll, hidden, auto]" apply to a flex container?

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Fri, 25 Jan 2013 15:13:45 -0800
Message-ID: <CAAWBYDA2co76nKxmJQc_WULP=hwdJ1i4szttLg3YWjKrk8rLfA@mail.gmail.com>
To: Daniel Holbert <dholbert@mozilla.com>
Cc: www-style list <www-style@w3.org>
On Fri, Jan 25, 2013 at 3:05 PM, Daniel Holbert <dholbert@mozilla.com> wrote:
> Hi www-style,
>
> Question: Should a flex container honor "overflow:[scroll,hidden,auto]"?
>
> >From my reading of the spec, I think the answer is "no -- overflow
> should have no effect on a flex container".  But the implementations in
> Chrome dev channel & Opera 12.12 seem to disagree with me, so I figured
> I'd get clarification and see if I'm missing something.
>
> Here's a testcase, FWIW:
> https://people.mozilla.com/~dholbert/tests/flexbox/compat_tests/flex-container-overflow-scroll.html
>
> My reasoning for why "overflow" should have no effect:
>  (a) The property definition specifically targets "block container
> elements":
>        # This property specifies whether content of a
>        # block container element is clipped when it
>        # overflows the element's box
>     http://www.w3.org/TR/CSS21/visufx.html#overflow
>
>  (b) The flexbox spec explicitly says:
>        # Flex containers are not block containers
>     http://dev.w3.org/csswg/css3-flexbox/#flex-containers
>
> So, combining (a) and (b): "overflow" specifies something about block
> container elements, and flex containers are not block containers --
> hence, overflow should *not* apply to flex containers.
>
> Am I missing something?
>
> (Whichever behavior is determined to be correct, this could probably
> stand to be clarified in the flexbox spec.)

Overflow definitely needs to apply, imo.  The fact that it technically
doesn't per spec is a result of CSS 2.1 being way too willing to
assign qualities to "block containers", but then making "block
containers" to specific to apply to anything but "display:block;".

~TJ
Received on Friday, 25 January 2013 23:14:32 GMT

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