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

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Wed, 27 Apr 2016 16:23:19 -0700
Message-ID: <CAAWBYDAwmeFyACbQBRtz3Tik_xiQ7U-RYTDBOip7=1qAVBwzQw@mail.gmail.com>
To: Brian Birtles <bbirtles@mozilla.com>
Cc: Simon Fraser <smfr@me.com>, "www-style@w3.org list" <www-style@w3.org>
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.

~TJ
Received on Wednesday, 27 April 2016 23:24:06 UTC

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