Re: [csswg-drafts] [css-contain] `contain` may not want to be animatable.

The Working Group just discussed `Contain may not want to be animatable`, and agreed to the following:

* `RESOLVED: contain is not animatable`
* `RESOLVED: will-change is not animatable`

<details><summary>The full IRC log of that discussion</summary>
&lt;fantasai> Topic: Contain may not want to be animatable<br>
&lt;Rossen> github:https://github.com/w3c/csswg-drafts/issues/2737<br>
&lt;fantasai> birtles: Since then I spoke to someone working on optimizations that key off contain<br>
&lt;fantasai> birtles: He agreed that unless there's a compelling use case to make contain animatable, safest to make it not animatable for now<br>
&lt;fantasai> TabAtkins: I'm fine with that<br>
&lt;fantasai> florian: Currently discrete, wnat to change to none<br>
&lt;fantasai> fantasai: +1 from me<br>
&lt;fantasai> dbaron: Does this match display?<br>
&lt;fantasai> florian: yeah, that's the point<br>
&lt;fantasai> RESOLVED: contain is not animatable<br>
&lt;fantasai> ericwilligers: How about will-change?<br>
&lt;fantasai> TabAtkins: animating will-change is probably wrong.<br>
&lt;fantasai> fantasai: It could impact your internal structures, so probably good to make not animatable<br>
&lt;fantasai> birtles: [...]<br>
&lt;fantasai> birtles: If your transition has will-change in it, then stacking contexts might change...<br>
&lt;fantasai> shane: I agree with your argument<br>
&lt;dbaron> s/[...]/spec says that transform animations cause a stacking context during the entire delay phase of the animation; if you apply that to will-change as well.../<br>
&lt;dbaron> birtles also mentioned the use case of setting 'will-change' a second before the animation actually starts doing things<br>
&lt;fantasai> birtles: We might be able to fix that layer, but for now seems better to make it not animatable for now<br>
&lt;fantasai> RESOLVED: will-change is not animatable<br>
&lt;TabAtkins> `will-not-change` obvs<br>
</details>


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Received on Thursday, 5 July 2018 00:12:39 UTC