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Re: [csswg-drafts] [web-animations-1] Finished pending state (#5452)

From: verbessern via GitHub <sysbot+gh@w3.org>
Date: Wed, 19 Aug 2020 16:15:09 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-676522551-1597853707-sysbot+gh@w3.org>
OK, my suspicious is growing. When the `pending finished notification micro task` is run, as an element of the `micro task queue`, where the `promises` are also queued (as far as I'm reading around), that means that the `resolving the finished promise` (`finish notification steps, step 2`), may trigger a sequence of changes (play/set current time) to the animation (that its later run in the same micro task cycle), that cause the finish notification micro task, again, asynchronously, to be added to the `micro task queue`. 
This may cause a stall of the micro task queue, because its run till depletion. That effect can't be observed in the play/pause `simple tasks`, because they are not using the micro task queue (at least in the implementation in question), even that they are also resolving a promise (the `ready` one). If what I'm deducting is true, then if the finished notification is also run out of the `micro task queue` as the play/pause tasks, then that could be prevented.

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