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Re: [css3-animations] Establishing stacking context at animation start

From: Brian Birtles <bbirtles@mozilla.com>
Date: Thu, 28 Apr 2016 09:02:58 +0900
To: "Tab Atkins Jr." <jackalmage@gmail.com>
Cc: Simon Fraser <smfr@me.com>, "www-style@w3.org list" <www-style@w3.org>
Message-ID: <57215332.3010405@mozilla.com>
On 2016/04/28 8:23, Tab Atkins Jr. wrote:
> On Wed, Apr 27, 2016 at 4:16 PM, Brian Birtles <bbirtles@mozilla.com> wrote:
>> On 2016/04/27 13:49, Brian Birtles wrote:
>>> I've noticed that IE and Edge appear to do this already.[2] Their
>>> behavior also differs in the test case Simon provided.[3]
>>>
>>> Since IE and Edge already do this, WebKit seems interested, and it would
>>> seem to provide performance advantages, any chance we could revisit this?
>>
>> I should also mention that CSS Transitions create a stacking context during
>> the delay phase in at least Blink, Gecko, Edge, and IE.
>
> Sigh, all right.  In that case, let's specify that, when an
> animation/transition is active, the UA must act as if 'will-change'
> additionally includes all the properties involved.  That answers all
> the questions about how this should act, since it's already been
> answered once.

That suits me with the clarification that "active" excludes animations 
that have finished and are not filling forwards.

I'll wait a few days before making the edits to the spec to give others 
a chance to raise objections.

Thanks,

Brian
Received on Thursday, 28 April 2016 00:03:29 UTC

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