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Re: [css-ui-3] box-sizing: padding-box

From: Florian Rivoal <florian@rivoal.net>
Date: Mon, 22 Jun 2015 23:55:20 +0200
Cc: Jonathan Kingston <jonathan@jooped.com>, Patrick Dark <www-style.at.w3.org@patrick.dark.name>, "www-style@w3.org" <www-style@w3.org>
Message-Id: <955AFB9D-7645-48B7-95B7-587D92CE9DF4@rivoal.net>
To: "Tab Atkins Jr." <jackalmage@gmail.com>

> On 22 Jun 2015, at 23:03, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
> 
> On Mon, Jun 22, 2015 at 1:33 PM, Florian Rivoal <florian@rivoal.net> wrote:
>>> On 22 Jun 2015, at 22:10, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
>>> On Mon, Jun 22, 2015 at 12:50 PM, Florian Rivoal <florian@rivoal.net> wrote:
>>>>> On 22 Jun 2015, at 21:40, Jonathan Kingston <jonathan@jooped.com> wrote:
>>>>> 
>>>>> However could I ask if there was a reason margin-box was never considered?
>>>> 
>>>> It was considered. I've been through the archives of the www-style recently, and there were about 2 or 3 discussions during the last 15 years on this topic.
>>>> 
>>>> The conclusion was that it was possible, but that there was not enough demand / not enough use cases to
>>>> justify specifying, writing tests, implementing, etc...
>>> 
>>> Importantly, margin-collapsing makes it very unclear exactly what the
>>> bounds of your margin box are.  Solving this is tricky, and unlikely
>>> to always (or even often) be what is wanted.
>> 
>> I don't think that's true. It might be somewhat counter-intuitive, but there's no particular difficulty in defining what it would do.
>> 
>> See Hixie debunking this point 16 years ago: https://lists.w3.org/Archives/Public/www-style/1999Nov/0037.html
> 
> That's *an* answer, yes.  It's not clear that it's the best answer,
> just that it's probably the simplest.

When it comes to something that involves margin collapsing, I think choosing anything other than the simplest answer is probably a mistake. Especially when this simplest answer is "don't change how margin collapsing works".

 - Florian
Received on Monday, 22 June 2015 21:55:51 UTC

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