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Re: Fwd: XBL2: First Thoughts and Use Cases

From: Olli Pettay <Olli.Pettay@helsinki.fi>
Date: Thu, 16 Dec 2010 12:23:22 -0800
Message-ID: <4D0A753A.7030006@helsinki.fi>
To: "Tab Atkins Jr." <jackalmage@gmail.com>
CC: Boris Zbarsky <bzbarsky@mit.edu>, Dimitri Glazkov <dglazkov@google.com>, public-webapps <public-webapps@w3.org>
On 12/16/2010 11:52 AM, Tab Atkins Jr. wrote:
> On Thu, Dec 16, 2010 at 10:40 AM, Boris Zbarsky<bzbarsky@mit.edu>  wrote:
>> On 12/15/10 11:29 AM, Dimitri Glazkov wrote:
>>>
>>> That seems like an implementation detail. Metadata can be shared and
>>> cloned as needed, just like styles in CSS.
>>
>> Sort of.  It would need to be cloned as soon as the shadow tree is mutated,
>> right?  That seems like very fragile behavior from a web author point of
>> view, where it's easy to deoptimize without realizing it.
>
> At least we can produce simple advice on how to definitely avoid
> deoptimizing - stick with the declarative syntax and don't mutate the
> shadow.
>
> With luck, enough use-cases will be solveable with the declarative
> syntax that this will be an acceptable restriction.

Well, at least with XBL1 modifying the shadow tree is very common.
And I would assume that to be rather common with XBL2 too.


-Olli


>
> ~TJ
>
>
Received on Thursday, 16 December 2010 20:24:09 GMT

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