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Re: [css-regions] Changing behavior of a named flow without a region chain

From: Alan Stearns <stearns@adobe.com>
Date: Tue, 23 Apr 2013 12:36:04 -0700
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: "www-style@w3.org" <www-style@w3.org>
Message-ID: <CD9C2ECB.292CB%stearns@adobe.com>
On 4/23/13 12:19 PM, "Tab Atkins Jr." <jackalmage@gmail.com> wrote:

>On Tue, Apr 23, 2013 at 11:10 AM, Alan Stearns <stearns@adobe.com> wrote:
>> So a named flow without a region chain formats its content as normal, in
>> place in the parent flow. It's only when you add flow-from that the
>> display moves from its original location to the region chain. The
>>behavior
>> is exactly the same when you have a matched pair of flow-into and
>> flow-from. The only change is when you're lacking the flow-from, the
>> content does not disappear.
>
>I think this is reasonable a priori, but it may have knock-on effects.
> It means that you can't lay out an element with flow-into until
>you've finished resolving styles against the rest of the page, and
>know whether or not there's an appropriate flow-from.
>
>Other layout modes can also require resolving styles against other
>parts of the document before laying out an early element, but they
>tend to be bounded in how far they can be affected.  This applies over
>the entire document.

I agree this could be an issue. It's somewhat analogous to setting
'display:flex' on the body element, and having an element at the end of a
long page compute to 'order:-1', correct? If you're laying things out
before the entire page resolves styles the boxes laid out earlier will
jump down as everything lays out again.

We already have this problem if you have a very long page that starts with
a flow-from element, and the flow-into elements come at the end of the
page. You either lay out an empty region that pops open with content later
on, or you have to wait until you've resolved styles on everything before
laying out content in the region.

I think the benefit of content not disappearing in all cases beats out the
detriment of content laying out twice in some edge cases.

Thanks,

Alan
Received on Tuesday, 23 April 2013 19:37:00 UTC

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