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Re: Control over collapsing margins

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 22 Apr 2009 09:55:20 -0500
Message-ID: <dd0fbad0904220755v6325d853s38f971319cd4cb60@mail.gmail.com>
To: Niels Matthijs <niels.matthijs@internetarchitects.be>
Cc: www-style@w3.org
On Wed, Apr 22, 2009 at 5:27 AM, Niels Matthijs
<niels.matthijs@internetarchitects.be> wrote:
> Hi all,
> I was reading up on collapsing margins as they've been causing me quite some trouble. Whenever a child element has a different background styling from its parent, collapsing margins are usually troublesome. The collapse is broken by padding and borders, but not by different style of background (which also indicates separation).
> Rather than change the rules for collapsing, I wonder if it wouldn't be better to give css people the opportunity to manage them themselves if needed. In short, introduce a new property which can break the collapse when needed, because adding unneeded borders, paddings or overflows is really not the way to go.
> Further explanations of my view can be found in the following article:
> http://www.onderhond.com/blog/work/collapsing-margins-improvement
> I apologize if this issue was already raised, but couldn't find any information about it.

I know that a property to indicate that an element should form a block
formatting context has been suggested before.  That would prevent
margins from collapsing, as well as doing a few other things.  Would
that be acceptable?

I agree that the ability to stop margin collapsing at will would be
occasionally useful.  I've had to hack around the problem with 1px
padding or border before as well.

Received on Wednesday, 22 April 2009 14:56:00 UTC

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