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Re: Proposal for "overflow:clip" for stronger painting isolation

From: Bruno Racineux <bruno@hexanet.net>
Date: Fri, 18 Oct 2013 15:46:43 -0700
To: Alan Gresley <alan@css-class.com>, "Kang-Hao (Kenny) Lu" <kanghaol@oupeng.com>
CC: www-style list <www-style@w3.org>, "Tab Atkins Jr." <jackalmage@gmail.com>
Message-ID: <CE86DF63.76CB8%bruno@hexanet.net>

On 10/18/13 2:32 AM, "Alan Gresley" <alan@css-class.com> wrote:

>On 18/10/2013 7:38 PM, Bruno Racineux wrote:
>>
>> On 10/17/13 2:57 PM, "Kang-Hao (Kenny) Lu" <kanghaol@oupeng.com> wrote:
>>
>>> (2013/10/18 5:35), Tab Atkins Jr. wrote:
>>>> On Thu, Oct 17, 2013 at 2:23 PM, Bruno Racineux <bruno@hexanet.net>
>>>> wrote:
>>>>> Does this proposal address "clearing the float" at all?
>>>>>
>>>>> I would be ideal is there was a native solution for this by now,
>>>>>rather
>>>>> than the 'clearfix' hacks.
>>>>>
>>>>> And while 'overflow:hidden' helps, it's not a comprehensive solution
>>>>>to
>>>>> clear-fixing.
>>>>
>>>> This is basically a more powerful/comprehensive overflow:hidden, so it
>>>> addresses float clearing as well as overflow:hidden does.
>>>
>>> I suppose this reads
>>>
>>>   'overflow: clip' doesn't address "clearing the float"
>>>
>>> ? I am not criticizing the proposal as the use cases might just be
>>> parallel,
>>
>> I bring this due to the implications between overflow:hidden and
>>"clearing
>> the float". And for lack of introduction perhaps, I am curious to
>> understand what overflow:clip intends to achieve or address.
>
>Why is it that when Tab attempts to start or continue this thread that
>it get hijacked into being a thread about clearing floats?

Alan, the words 'curious for lack of introduction', or asking a question
as to whether this proposal includes something or not (which Tab says it
does) are not anywhere near the semantics of 'hijacking' anything. Chill
out. I am just asking question and presenting a use case I find
problematic which is completely related.

>I will quote Tab.
>
> > In particular, isolating the painting of an element seems like a big
> > win - having some way to guarantee that the element can be
> > hard-clipped to its boundary without losing anything important.
> > overflow:hidden doesn't*quite*  do this - abspos and fixpos elements
> > can escape the bounds of the element.

Ok, I admit I have initially overlooked his explanations.

What I am trying to address is the following use case:

<style type="text/css">
.row { width:100%; clear:both; margin-bottom: 10px; background-color:
#bbb; }
.cib { display:inline-block; width:30%; overflow: hidden; margin-left:
10px; background-color: #444; }
b { display: block; color:#fff; text-align: center;}
</style>
</head>
<body>

<div class="row">
<div class="cib"><b>Cannot be contained by wrapper</b></div>
<div class="cib"><b>Cannot be contained by wrapper</b></div>
</div>
<div class="row">
<div class="cib"><b>Cannot be contained by wrapper</b></div>
<div class="cib"><b>Cannot be contained by wrapper</b></div>
</div>

Call it perhaps clearing the flow vs clearing the float...

Basically the issue here is that inline-blocks with overflow: hidden;
cannot be contained here, no matter what your wrapper has. i.e. I can't
have the benefits of overflow: hidden; and prevent scrolling at the same
time on the inline-blocks.


In that, an overflow:clip that prevents scrolling would be useful.

It would help clipping the overflow of an inline-block without the current
caveat.

Or I like François REMY' suggestion with "paint-limit: [ [ content-box |
border-box | margin-box ] <paint-limit-padding>? ] | none" at the wrapper
level.
It could be a lot more flexible.

Bruno


>Test case.
>
><style type="text/css">
>div { height: 100px; width: 100px; border: 5px solid black; }
></style>
>
><div style="overflow:hidden">
><p>Some text that will overflow</p>
><p>Some text that will overflow</p>
><p>Some text that will overflow</p>
><p>Some text that will overflow</p>
><p>Some text that will overflow</p>
><div style="position:absolute;right:0;bottom:0;background:lime">Where am
>I located?</div>
></div>
>Alan
>
>
>
>-- 
>Alan Gresley
>http://css-3d.org/
>http://css-class.com/
Received on Friday, 18 October 2013 22:47:14 UTC

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