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Re: [csswg-drafts] [css-contain-2] content-visibility should pause css animations in subtree (#5611)

From: vmpstr via GitHub <sysbot+gh@w3.org>
Date: Tue, 13 Oct 2020 16:05:50 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-707846003-1602605150-sysbot+gh@w3.org>
content-visibility doesn't actually say that we skip styling, it just tries to set itself up in a way that allows style to be skipped (ie it's a "should" language not "must"). Without any explicit mention of what happens with animations, I think the only possible interpretation is that these animations are created in the same way as if content-visibility was not present. In Chromium, this would currently be a bug. And you're right that on forced style, the animation would be created and start ticking.

The intent of pausing the animation is that it allows us to not tick the animation whether it has already been created or not. In turn, I believe this means that we can actually skip style (at least from the animations perspective)

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