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Re: Feedback and questions on shadow DOM and web components

From: Angelina Fabbro <angelinafabbro@gmail.com>
Date: Tue, 13 Nov 2012 17:29:21 -0800
Message-ID: <CAG57-HPWtQ8k92xH5nURtep9s4uN7PZx5j7YZ1hn-d_84N90qg@mail.gmail.com>
To: Brian Kardell <bkardell@gmail.com>
Cc: public-webapps@w3.org
To answer Brian:

1. To recap:

- A developer can dynamically add and remove individual custom elements to
and from the parent document.
- A developer cannot dynamically apply or unapply the 'is' attribute to
have an element behave like a custom <element> on the fly.

Is this correct?

Being able to take the host children and remix them into something else on
the fly would be fantastic, so I'm a bit disappointed if the above is true.

2. Thanks for that, I'll use that assumption as well.

To answer myself in the parent post about accessibility: I found a short
explanation in the docs about the tree-as-rendered being traversable in
section 8.5 as follows:

"User agents with assistive technology traverse the document tree as
rendered, and thus enable full use of of WAI-ARIA semantics in the shadow
DOM subtrees."

So that's good.

On Tue, Nov 13, 2012 at 4:50 PM, Brian Kardell <bkardell@gmail.com> wrote:

>  Brian Kardell :: @bkardell :: hitchjs.com
> On Nov 13, 2012 9:34 AM, "Angelina Fabbro" <angelinafabbro@gmail.com>
> wrote:
> >
> > Hello public-webapps,
> >
> > I'm Angelina, and I've been very interested in shadow DOM and web
> components for some time now. So much so that I've tried to teach people
> about them several times. There's a video from JSConfEU floating around on
> Youtube if you're interested . I think I managed to get the important parts
> right despite my nerves. I've given this sort of talk four times now, and
> as a result I've collected some feedback and questions from the developers
> I've talked to.
> >
> > 1. It looks like from the spec and the code in Glazkov's polyfill that
> if I add and remove the 'is' attribute, the shadow tree should
> apply/unapply itself to the host element.
> Two things: 1. Added in markup or dynamically?  The draft says it can't be
> added dynamically just in case...  2.  The draft itself is a little unclear
> on "is".  Early in the text, the reference was changed to say that these
> will be custom tags, in other words <x-map> instead of <select
> is="x-map">.  Mozilla's x-tags is currently operating under that assumption
> as well.
> > I've not found this to be the case. See my examples for 2. below - I
> tried applying and unapplying the 'is' attribute to remix the unordered
> list using a template without success.
> >
> >
> >
Received on Wednesday, 14 November 2012 01:30:29 UTC

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