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Re: Question regarding the "all" property

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 23 Jan 2013 10:36:33 -0800
Message-ID: <CAAWBYDB1xTNx0FkGhLaj9rMeBTqfqNvCmMXOm80ozNeurc+iOQ@mail.gmail.com>
To: Philip Walton <philip@philipwalton.com>
Cc: www-style list <www-style@w3.org>
On Wed, Jan 23, 2013 at 10:09 AM, Philip Walton <philip@philipwalton.com> wrote:
> I'm writing about the new "all" property and I just wanted to make sure I'm
> factually correct on a few points:
>
> "all" is just a regular CSS property and all the normal specificity rules of
> the cascade apply, correct?
>
> That means that if I've done something like:
>
> #sidebar > div { background: red; }
>
> Then the following rule, if applied to a <div> in the sidebar will not
> override the previous background definition.
>
> .widget { all: default; }
>
> If so, that implies that the all property cannot be used to achieve true
> encapsulation, it's just a simple way for authors to undo what they've
> already done (no judgment either way, just checking).
>
> Am I'm understanding this correctly?

Yes.  It's just a normal shorthand property, exactly the same as
'background' or 'transition' or 'border'.  It just happens to
shorthand *all* of the properties, rather than a subset.

(For context, since Ms2ger just asked about this in another channel,
the 'all' property was recently added to the Cascade module:
<http://dev.w3.org/csswg/css3-cascade/#all-shorthand>.)

Stronger encapsulation requires more powerful concepts than we can get
with just the cascade, and probably coordination with other
technologies.  Luckily, precisely that already exists - the Web
Components spec, which is being implemented in multiple browsers, is
designed explicitly for this kind of thing, so you can write a widget
and "hide" its DOM inside of a "shadow", which can't be targeted by
the outer page's CSS at all unless the component author allows it.

~TJ
Received on Wednesday, 23 January 2013 18:37:22 GMT

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