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[web-animations-2] moving from a progress-based timeline to a monotonic timeline can yield incompatible timeline time and animation current time · Issue #11761 · w3c/csswg-drafts · GitHub
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time","number":11761,"repository":{"nameWithOwner":"w3c/csswg-drafts","id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","login":"w3c","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","url":"https://github.com/w3c"},"isArchived":false,"isPrivate":false,"databaseId":9252268,"slashCommandsEnabled":false,"viewerCanInteract":false,"viewerInteractionLimitReasonHTML":"","planFeatures":{"maximumAssignees":10},"visibility":"PUBLIC","pinnedIssues":{"totalCount":0},"viewerCanPinIssues":false,"issueTypes":{"edges":[{"node":{"id":"IT_kwDOAAXJUM4AAanL"}},{"node":{"id":"IT_kwDOAAXJUM4AAanO"}},{"node":{"id":"IT_kwDOAAXJUM4AAanR"}}]}},"titleHTML":"[web-animations-2] moving from a progress-based timeline to a monotonic timeline can yield incompatible timeline time and animation current time","url":"https://github.com/w3c/csswg-drafts/issues/11761","viewerCanUpdateNext":false,"issueType":null,"state":"OPEN","stateReason":null,"duplicateOf":null,"linkedPullRequests":{"nodes":[]},"subIssuesSummary":{"total":0,"completed":0},"__isLabelable":"Issue","labels":{"edges":[{"node":{"id":"MDU6TGFiZWwxNTYxNTM1MTU1","color":"c5def5","name":"scroll-animations-1","nameHTML":"scroll-animations-1","description":"Current Work","url":"https://github.com/w3c/csswg-drafts/labels/scroll-animations-1","__typename":"Label"},"cursor":"MQ"},{"node":{"id":"MDU6TGFiZWw3Njk2MzUwMDM=","color":"c5def5","name":"web-animations-2","nameHTML":"web-animations-2","description":"Current Work","url":"https://github.com/w3c/csswg-drafts/labels/web-animations-2","__typename":"Label"},"cursor":"Mg"}],"pageInfo":{"endCursor":"Mg","hasNextPage":false}},"__isNode":"Issue","assignees":{"nodes":[]},"milestone":null,"databaseId":2868897578,"viewerDidAuthor":false,"locked":false,"author":{"__typename":"User","__isActor":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4","profileUrl":"https://github.com/graouts","avatarUrl":"https://avatars.githubusercontent.com/u/49648?u=91c313bd9390e81d9279cddf92042de49788296c\u0026v=4"},"__isComment":"Issue","body":"I'm working on a failure in the WPT subtest \"Playback rate affects whether active phase boundary is inclusive\" in `scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative.html` and encountered what appears to be a spec issue. I've simplified the test in this particular reduction:\n\n```html\n\u003cstyle\u003e\n\n.scroller {\n overflow: scroll;\n height: 200px;\n width: 200px;\n}\n\n.contents {\n height: 1200px;\n width: 100%;\n background-color: green;\n}\n\n\u003c/style\u003e\n\n\u003cdiv class=\"scroller\"\u003e\n \u003cdiv class=\"contents\"\u003e\u003c/div\u003e\n\u003c/div\u003e\n\n\u003cscript\u003e\n\n(async function () {\n // create an animation associated with a progress-based timeline\n const timeline = new ScrollTimeline({ source: document.querySelector(\".scroller\") });\n const animation = document.querySelector(\".contents\").animate({ opacity: [0.1, 1] }, { timeline });\n\n await Promise.all([animation.ready, new Promise(requestAnimationFrame)]);\n\n // set the animation to the \"after\" phase\n const scroller = animation.timeline.source;\n const maxScroll = scroller.scrollHeight - scroller.clientHeight;\n scroller.scrollTop = 1.5 * maxScroll;\n\n // wait a frame and set the timeline to a monotonic timeline\n await new Promise(requestAnimationFrame);\n animation.timeline = document.timeline;\n})();\n\n\u003c/script\u003e\n```\n\nIn WebKit – at the time of writing ([290776@main](https://commits.webkit.org/290776@main)) – this particular test yields a debug assertion because we end up attempting an operation with a time value that is expressed in seconds and one expressed as a percentage. Here's how we get there, and I believe in accordance with the current specifications:\n\n### Step 1\n\nUnder the call to `Element.animate()`, the procedure to [set the timeline of an animation](https://drafts.csswg.org/web-animations-2/#setting-the-timeline) takes us inside the \"if to finite timeline\" branch and we set both the _start time_ and the _hold time_ to be _unresolved_.\n\n### Step 2\n\nAs the _update animations and send events_ procedure is triggered and the animation becomes _ready_, we [calculate an auto-aligned start time](https://drafts.csswg.org/web-animations-2/#animation-calculating-an-auto-aligned-start-time) and set the _start time_ to `0%` as the _hold time_ remains _unresolved_.\n\n### Step 3\n\nAfter the animation timeline's source changes scroll position, and during the next occurence of the _update animations and send events_ procedure, we [update the animation's finished state](https://drafts.csswg.org/web-animations-1/#update-an-animations-finished-state) and match this condition:\n\n\u003e If all three of the following conditions are true,\n\u003e \n\u003e - the unconstrained current time is resolved, and\n\u003e - animation’s start time is resolved, and\n\u003e - animation does not have a pending play task or a pending pause task,\n\u003e \n\u003e then update animation’s hold time based on the first matching condition for animation from below, if any:\n\n… and then match this condition:\n\n\u003e If playback rate \u003e 0 and unconstrained current time is greater than or equal to associated effect end\n\n… and finally this sub-condition:\n\n\u003e If did seek is false, let the hold time be the maximum value of previous current time and associated effect end.\n\nAs a result, the _hold time_ is set to `100%` and the _start time_ remains set to `0%`.\n\n### Step 4\n\nAs we [set the timeline](https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation) to the document timeline, and as such move from a progress-based timeline to a monotonic timeline, we enter this condition:\n\n\u003e If from finite timeline and previous progress is resolved,\n\u003e Run the procedure to set the current time to previous progress * end time.\n\nAs such we immediately run the procedure to [silently set the current time](https://drafts.csswg.org/web-animations-2/#silently-set-the-current-time) and enter this condition:\n\n\u003e If any of the following conditions are true:\n\u003e\n\u003e - animation’s hold time is resolved, or\n\u003e - animation’s start time is unresolved, or\n\u003e - animation has no associated timeline or the associated timeline is inactive, or\n\u003e - animation’s playback rate is 0,\n\u003e\n\u003e Set animation’s hold time to seek time.\n\nAs a result, the _hold time_ becomes `0s` and the _start time_ remains `0%`. Note that these two times are now using different time units.\n\nAs the [setting the timeline](https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation) procedure continues, we additionally run this step:\n\n\u003e If the start time of animation is resolved, make animation’s hold time unresolved.\n\nAs a result, the _hold time_ becomes unresolved and the _start time_ remains `0%`.\n\nTo finish [setting the timeline](https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation) we [update the animation's finished state](https://drafts.csswg.org/web-animations-1/#update-an-animations-finished-state) and attempt to compute the unconstrained current time at which point we attempt to compute:\n\n```\ncurrent time = (timeline time - start time) * playback rate\n```\n\nThe _timeline time_ is a resolved time expressed in seconds since the timeline is monotonic while the start time has remained `0%`. This is when WebKit hits a debug assertion.\n\nThe WPT in question test immediately sets the current time to `0` but I don't think we should be in the situation described above as we set the timeline.","bodyHTML":"\u003cp dir=\"auto\"\u003eI'm working on a failure in the WPT subtest \"Playback rate affects whether active phase boundary is inclusive\" in \u003ccode class=\"notranslate\"\u003escroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative.html\u003c/code\u003e and encountered what appears to be a spec issue. I've simplified the test in this particular reduction:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-text-html-basic notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"\u0026lt;style\u0026gt;\n\n.scroller {\n overflow: scroll;\n height: 200px;\n width: 200px;\n}\n\n.contents {\n height: 1200px;\n width: 100%;\n background-color: green;\n}\n\n\u0026lt;/style\u0026gt;\n\n\u0026lt;div class=\u0026quot;scroller\u0026quot;\u0026gt;\n \u0026lt;div class=\u0026quot;contents\u0026quot;\u0026gt;\u0026lt;/div\u0026gt;\n\u0026lt;/div\u0026gt;\n\n\u0026lt;script\u0026gt;\n\n(async function () {\n // create an animation associated with a progress-based timeline\n const timeline = new ScrollTimeline({ source: document.querySelector(\u0026quot;.scroller\u0026quot;) });\n const animation = document.querySelector(\u0026quot;.contents\u0026quot;).animate({ opacity: [0.1, 1] }, { timeline });\n\n await Promise.all([animation.ready, new Promise(requestAnimationFrame)]);\n\n // set the animation to the \u0026quot;after\u0026quot; phase\n const scroller = animation.timeline.source;\n const maxScroll = scroller.scrollHeight - scroller.clientHeight;\n scroller.scrollTop = 1.5 * maxScroll;\n\n // wait a frame and set the timeline to a monotonic timeline\n await new Promise(requestAnimationFrame);\n animation.timeline = document.timeline;\n})();\n\n\u0026lt;/script\u0026gt;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003estyle\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\n.\u003cspan class=\"pl-c1\"\u003escroller\u003c/span\u003e {\n \u003cspan class=\"pl-c1\"\u003eoverflow\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e scroll;\n \u003cspan class=\"pl-c1\"\u003eheight\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e200\u003cspan class=\"pl-smi\"\u003epx\u003c/span\u003e\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003ewidth\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e200\u003cspan class=\"pl-smi\"\u003epx\u003c/span\u003e\u003c/span\u003e;\n}\n\n.\u003cspan class=\"pl-c1\"\u003econtents\u003c/span\u003e {\n \u003cspan class=\"pl-c1\"\u003eheight\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1200\u003cspan class=\"pl-smi\"\u003epx\u003c/span\u003e\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003ewidth\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e100\u003cspan class=\"pl-smi\"\u003e%\u003c/span\u003e\u003c/span\u003e;\n \u003cspan class=\"pl-c1\"\u003ebackground-color\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e:\u003c/span\u003e green;\n}\n\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003estyle\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003ediv\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eclass\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003escroller\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n \u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003ediv\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eclass\u003c/span\u003e=\"\u003cspan class=\"pl-s\"\u003econtents\u003c/span\u003e\"\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003ediv\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003ediv\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\n\n\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-k\"\u003easync\u003c/span\u003e \u003cspan class=\"pl-k\"\u003efunction\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e\n \u003cspan class=\"pl-c\"\u003e// create an animation associated with a progress-based timeline\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003etimeline\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003eScrollTimeline\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003esource\u003c/span\u003e: \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003equerySelector\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\".scroller\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eanimation\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003equerySelector\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s\"\u003e\".contents\"\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eanimate\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003eopacity\u003c/span\u003e: \u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003e0.1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-kos\"\u003e{\u003c/span\u003e timeline \u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePromise\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-en\"\u003eall\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e[\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003eanimation\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eready\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e,\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePromise\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003erequestAnimationFrame\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e]\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// set the animation to the \"after\" phase\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003escroller\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003eanimation\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003etimeline\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003esource\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emaxScroll\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003escroller\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003escrollHeight\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e-\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003escroller\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003eclientHeight\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003escroller\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003escrollTop\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e1.5\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e*\u003c/span\u003e \u003cspan class=\"pl-s1\"\u003emaxScroll\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n \u003cspan class=\"pl-c\"\u003e// wait a frame and set the timeline to a monotonic timeline\u003c/span\u003e\n \u003cspan class=\"pl-k\"\u003eawait\u003c/span\u003e \u003cspan class=\"pl-k\"\u003enew\u003c/span\u003e \u003cspan class=\"pl-v\"\u003ePromise\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-s1\"\u003erequestAnimationFrame\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n \u003cspan class=\"pl-s1\"\u003eanimation\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003etimeline\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e=\u003c/span\u003e \u003cspan class=\"pl-smi\"\u003edocument\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e.\u003c/span\u003e\u003cspan class=\"pl-c1\"\u003etimeline\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\u003cspan class=\"pl-kos\"\u003e}\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e(\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e)\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e;\u003c/span\u003e\n\n\u003cspan class=\"pl-kos\"\u003e\u0026lt;/\u003c/span\u003e\u003cspan class=\"pl-ent\"\u003escript\u003c/span\u003e\u003cspan class=\"pl-kos\"\u003e\u0026gt;\u003c/span\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn WebKit – at the time of writing (\u003ca href=\"https://commits.webkit.org/290776@main\" rel=\"nofollow\"\u003e290776@main\u003c/a\u003e) – this particular test yields a debug assertion because we end up attempting an operation with a time value that is expressed in seconds and one expressed as a percentage. Here's how we get there, and I believe in accordance with the current specifications:\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eStep 1\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eUnder the call to \u003ccode class=\"notranslate\"\u003eElement.animate()\u003c/code\u003e, the procedure to \u003ca href=\"https://drafts.csswg.org/web-animations-2/#setting-the-timeline\" rel=\"nofollow\"\u003eset the timeline of an animation\u003c/a\u003e takes us inside the \"if to finite timeline\" branch and we set both the \u003cem\u003estart time\u003c/em\u003e and the \u003cem\u003ehold time\u003c/em\u003e to be \u003cem\u003eunresolved\u003c/em\u003e.\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eStep 2\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eAs the \u003cem\u003eupdate animations and send events\u003c/em\u003e procedure is triggered and the animation becomes \u003cem\u003eready\u003c/em\u003e, we \u003ca href=\"https://drafts.csswg.org/web-animations-2/#animation-calculating-an-auto-aligned-start-time\" rel=\"nofollow\"\u003ecalculate an auto-aligned start time\u003c/a\u003e and set the \u003cem\u003estart time\u003c/em\u003e to \u003ccode class=\"notranslate\"\u003e0%\u003c/code\u003e as the \u003cem\u003ehold time\u003c/em\u003e remains \u003cem\u003eunresolved\u003c/em\u003e.\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eStep 3\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eAfter the animation timeline's source changes scroll position, and during the next occurence of the \u003cem\u003eupdate animations and send events\u003c/em\u003e procedure, we \u003ca href=\"https://drafts.csswg.org/web-animations-1/#update-an-animations-finished-state\" rel=\"nofollow\"\u003eupdate the animation's finished state\u003c/a\u003e and match this condition:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf all three of the following conditions are true,\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ethe unconstrained current time is resolved, and\u003c/li\u003e\n\u003cli\u003eanimation’s start time is resolved, and\u003c/li\u003e\n\u003cli\u003eanimation does not have a pending play task or a pending pause task,\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003ethen update animation’s hold time based on the first matching condition for animation from below, if any:\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e… and then match this condition:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf playback rate \u0026gt; 0 and unconstrained current time is greater than or equal to associated effect end\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e… and finally this sub-condition:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf did seek is false, let the hold time be the maximum value of previous current time and associated effect end.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eAs a result, the \u003cem\u003ehold time\u003c/em\u003e is set to \u003ccode class=\"notranslate\"\u003e100%\u003c/code\u003e and the \u003cem\u003estart time\u003c/em\u003e remains set to \u003ccode class=\"notranslate\"\u003e0%\u003c/code\u003e.\u003c/p\u003e\n\u003ch3 dir=\"auto\"\u003eStep 4\u003c/h3\u003e\n\u003cp dir=\"auto\"\u003eAs we \u003ca href=\"https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation\" rel=\"nofollow\"\u003eset the timeline\u003c/a\u003e to the document timeline, and as such move from a progress-based timeline to a monotonic timeline, we enter this condition:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf from finite timeline and previous progress is resolved,\u003cbr\u003e\nRun the procedure to set the current time to previous progress * end time.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eAs such we immediately run the procedure to \u003ca href=\"https://drafts.csswg.org/web-animations-2/#silently-set-the-current-time\" rel=\"nofollow\"\u003esilently set the current time\u003c/a\u003e and enter this condition:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf any of the following conditions are true:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eanimation’s hold time is resolved, or\u003c/li\u003e\n\u003cli\u003eanimation’s start time is unresolved, or\u003c/li\u003e\n\u003cli\u003eanimation has no associated timeline or the associated timeline is inactive, or\u003c/li\u003e\n\u003cli\u003eanimation’s playback rate is 0,\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eSet animation’s hold time to seek time.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eAs a result, the \u003cem\u003ehold time\u003c/em\u003e becomes \u003ccode class=\"notranslate\"\u003e0s\u003c/code\u003e and the \u003cem\u003estart time\u003c/em\u003e remains \u003ccode class=\"notranslate\"\u003e0%\u003c/code\u003e. Note that these two times are now using different time units.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAs the \u003ca href=\"https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation\" rel=\"nofollow\"\u003esetting the timeline\u003c/a\u003e procedure continues, we additionally run this step:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf the start time of animation is resolved, make animation’s hold time unresolved.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eAs a result, the \u003cem\u003ehold time\u003c/em\u003e becomes unresolved and the \u003cem\u003estart time\u003c/em\u003e remains \u003ccode class=\"notranslate\"\u003e0%\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eTo finish \u003ca href=\"https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation\" rel=\"nofollow\"\u003esetting the timeline\u003c/a\u003e we \u003ca href=\"https://drafts.csswg.org/web-animations-1/#update-an-animations-finished-state\" rel=\"nofollow\"\u003eupdate the animation's finished state\u003c/a\u003e and attempt to compute the unconstrained current time at which point we attempt to compute:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"current time = (timeline time - start time) * playback rate\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode class=\"notranslate\"\u003ecurrent time = (timeline time - start time) * playback rate\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003cem\u003etimeline time\u003c/em\u003e is a resolved time expressed in seconds since the timeline is monotonic while the start time has remained \u003ccode class=\"notranslate\"\u003e0%\u003c/code\u003e. This is when WebKit hits a debug assertion.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe WPT in question test immediately sets the current time to \u003ccode class=\"notranslate\"\u003e0\u003c/code\u003e but I don't think we should be in the situation described above as we set the timeline.\u003c/p\u003e","bodyVersion":"43493ffeae37d86dc5b1274357fd67aeeab1ea4e6e9c19737c05ecebfc9d63e2","createdAt":"2025-02-21T12:26:01Z","__isReactable":"Issue","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"viewerCanUpdateMetadata":false,"viewerCanComment":false,"viewerCanAssign":false,"viewerCanLabel":false,"__isIssueOrPullRequest":"Issue","projectItemsNext":{"edges":[],"pageInfo":{"endCursor":null,"hasNextPage":false}},"viewerCanSetMilestone":false,"isPinned":false,"viewerCanDelete":false,"viewerCanTransfer":false,"viewerCanConvertToDiscussion":false,"viewerCanLock":false,"viewerCanType":false,"frontTimelineItems":{"pageInfo":{"hasNextPage":false,"endCursor":"Y3Vyc29yOnYyOpPPAAABlSkJX3gBqzE2NDAyMDg5NTc3"},"totalCount":7,"edges":[{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":16399520630,"createdAt":"2025-02-21T12:26:13Z","actor":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/49648?s=64\u0026u=91c313bd9390e81d9279cddf92042de49788296c\u0026v=4"},"label":{"id":"MDU6TGFiZWw3Njk2MzUwMDM=","nameHTML":"web-animations-2","name":"web-animations-2","color":"c5def5","description":"Current Work"},"__isNode":"LabeledEvent","id":"LE_lADOAI0trM6q_-cqzwAAAAPRfNN2"},"cursor":"Y3Vyc29yOnYyOpPPAAABlSh4_ogBqzE2Mzk5NTIwNjMw"},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":16399520640,"createdAt":"2025-02-21T12:26:13Z","actor":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/49648?s=64\u0026u=91c313bd9390e81d9279cddf92042de49788296c\u0026v=4"},"label":{"id":"MDU6TGFiZWwxNTYxNTM1MTU1","nameHTML":"scroll-animations-1","name":"scroll-animations-1","color":"c5def5","description":"Current Work"},"__isNode":"LabeledEvent","id":"LE_lADOAI0trM6q_-cqzwAAAAPRfNOA"},"cursor":"Y3Vyc29yOnYyOpPPAAABlSh4_ogBqzE2Mzk5NTIwNjQw"},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":2674425558,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4"},"id":"I_kwDOAI0trM6q_-cq","number":11761,"locked":false,"databaseId":2868897578},"author":{"__typename":"User","login":"graouts","avatarUrl":"https://avatars.githubusercontent.com/u/49648?u=91c313bd9390e81d9279cddf92042de49788296c\u0026v=4","id":"MDQ6VXNlcjQ5NjQ4"},"id":"IC_kwDOAI0trM6faH7W","body":"Cc @flackr @andruud @kevers-google @bramus @BorisChiou @birtles.","bodyHTML":"\u003cp dir=\"auto\"\u003eCc \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/flackr/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/flackr\"\u003e@flackr\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/andruud/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/andruud\"\u003e@andruud\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/kevers-google/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/kevers-google\"\u003e@kevers-google\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/bramus/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/bramus\"\u003e@bramus\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/BorisChiou/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/BorisChiou\"\u003e@BorisChiou\u003c/a\u003e \u003ca class=\"user-mention notranslate\" data-hovercard-type=\"user\" data-hovercard-url=\"/users/birtles/hovercard\" data-octo-click=\"hovercard-link-click\" data-octo-dimensions=\"link_type:self\" href=\"https://github.com/birtles\"\u003e@birtles\u003c/a\u003e.\u003c/p\u003e","bodyVersion":"09d4ca1129c6a7086e405bbbe26ffc3f3172c798b61630cca734403805c0f423","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/11761#issuecomment-2674425558","createdAt":"2025-02-21T12:27:02Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABlSh5vfAAqjI2NzQ0MjU1NTg="},{"node":{"__typename":"ReferencedEvent","__isIssueTimelineItems":"ReferencedEvent","__isTimelineEvent":"ReferencedEvent","databaseId":16399666026,"createdAt":"2025-02-21T12:34:57Z","actor":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/49648?s=64\u0026u=91c313bd9390e81d9279cddf92042de49788296c\u0026v=4"},"willCloseSubject":false,"subject":{"__typename":"Issue","__isNode":"Issue","id":"I_kwDOAI0trM6q_-cq"},"commit":{"message":"[scroll-animations] WPT test scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative.html has failures\nhttps://bugs.webkit.org/show_bug.cgi?id=284545\nrdar://problem/141356963\n\nReviewed by NOBODY (OOPS!).\n\nThe technique used by this test to determine the phase [0] in which an animation\nis, which is not explicitly exposed via the Web Animations API, was not up-to-date\nwith the fact that progress-based animations remain active at the 100% boundary.\n\nSo we update the supporting `assert_phase()` function to deal with such animations\nand pass the previously failing assertion.\n\nBut going further into this test, we would hit a debug assertion when trying to compute\nthe unconstrained current time as we get to the end of the procedure to set the timeline\nas we move from the scroll timeline to the document timeline.\n\nI filed a spec issue [1] to deal with this and came up with a temporary fix to restore\nthe timing incompatibility and pass this test.\n\n[0] https://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states\n[1] https://github.com/w3c/csswg-drafts/issues/11761\n\n* LayoutTests/imported/w3c/web-platform-tests/scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative-expected.txt:\n* LayoutTests/imported/w3c/web-platform-tests/web-animations/testcommon.js:\n(assert_phase):\n* Source/WebCore/animation/WebAnimation.cpp:\n(WebCore::WebAnimation::setTimeline):","messageHeadlineHTML":"[scroll-animations] WPT test scroll-animations/scroll-timelines/scrol…","messageBodyHTML":"…l-animation-effect-phases.tentative.html has failures\n\n\u003ca href=\"https://bugs.webkit.org/show_bug.cgi?id=284545\" rel=\"nofollow\"\u003ehttps://bugs.webkit.org/show_bug.cgi?id=284545\u003c/a\u003e\nrdar://problem/141356963\n\nReviewed by NOBODY (OOPS!).\n\nThe technique used by this test to determine the phase [0] in which an animation\nis, which is not explicitly exposed via the Web Animations API, was not up-to-date\nwith the fact that progress-based animations remain active at the 100% boundary.\n\nSo we update the supporting `assert_phase()` function to deal with such animations\nand pass the previously failing assertion.\n\nBut going further into this test, we would hit a debug assertion when trying to compute\nthe unconstrained current time as we get to the end of the procedure to set the timeline\nas we move from the scroll timeline to the document timeline.\n\nI filed a spec issue [1] to deal with this and came up with a temporary fix to restore\nthe timing incompatibility and pass this test.\n\n[0] \u003ca href=\"https://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states\" rel=\"nofollow\"\u003ehttps://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states\u003c/a\u003e\n[1] \u003ca class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2868897578\" data-permission-text=\"Title is private\" data-url=\"https://github.com/w3c/csswg-drafts/issues/11761\" data-hovercard-type=\"issue\" data-hovercard-url=\"/w3c/csswg-drafts/issues/11761/hovercard\" href=\"https://github.com/w3c/csswg-drafts/issues/11761\"\u003ew3c/csswg-drafts#11761\u003c/a\u003e\n\n* LayoutTests/imported/w3c/web-platform-tests/scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative-expected.txt:\n* LayoutTests/imported/w3c/web-platform-tests/web-animations/testcommon.js:\n(assert_phase):\n* Source/WebCore/animation/WebAnimation.cpp:\n(WebCore::WebAnimation::setTimeline):","url":"https://github.com/graouts/WebKit/commit/cda00ebbed1284e9b98c5357e5cbc4c79e07f948","abbreviatedOid":"cda00eb","signature":null,"verificationStatus":"UNSIGNED","hasSignature":false,"repository":{"name":"WebKit","owner":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4"},"defaultBranch":"main","id":"R_kgDOHKbL6g"},"id":"C_kwDOHKbL6toAKGNkYTAwZWJiZWQxMjg0ZTliOThjNTM1N2U1Y2JjNGM3OWUwN2Y5NDg"},"__isNode":"ReferencedEvent","id":"REFE_lADOAI0trM6q_-cqzwAAAAPRfwtq"},"cursor":"Y3Vyc29yOnYyOpPPAAABlSiA_WgBqzE2Mzk5NjY2MDI2"},{"node":{"__typename":"CrossReferencedEvent","__isIssueTimelineItems":"CrossReferencedEvent","__isTimelineEvent":"CrossReferencedEvent","databaseId":2082954584,"createdAt":"2025-02-21T12:34:59Z","actor":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/49648?s=64\u0026u=91c313bd9390e81d9279cddf92042de49788296c\u0026v=4"},"source":{"__typename":"PullRequest","__isNode":"PullRequest","id":"PR_kwDOExyGPc6MCzSg"},"willCloseTarget":false,"referencedAt":"2025-02-21T12:34:57Z","target":{"__typename":"Issue","repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4"},"__isNode":"Issue","id":"I_kwDOAI0trM6q_-cq"},"innerSource":{"__typename":"PullRequest","__isReferencedSubject":"PullRequest","id":"PR_kwDOExyGPc6MCzSg","pullTitleHTML":"[scroll-animations] WPT test scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative.html has failures","url":"https://github.com/WebKit/WebKit/pull/41055","number":41055,"state":"MERGED","isDraft":false,"isInMergeQueue":false,"repository":{"id":"MDEwOlJlcG9zaXRvcnkzMjA2MzY0Nzc=","name":"WebKit","isPrivate":false,"owner":{"__typename":"Organization","login":"WebKit","id":"MDEyOk9yZ2FuaXphdGlvbjY0NTg="}},"__isNode":"PullRequest"},"__isNode":"CrossReferencedEvent","id":"CRE_kwDOExyGPc58J11Y"},"cursor":"Y3Vyc29yOnYyOpPPAAABlSiBBTgCqjIwODI5NTQ1ODQ="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":2674670835,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"graouts","id":"MDQ6VXNlcjQ5NjQ4"},"id":"I_kwDOAI0trM6q_-cq","number":11761,"locked":false,"databaseId":2868897578},"author":{"__typename":"User","login":"flackr","avatarUrl":"https://avatars.githubusercontent.com/u/366761?u=0268238fbc8a57f6156b96334dbf14a275d74ef5\u0026v=4","id":"MDQ6VXNlcjM2Njc2MQ=="},"id":"IC_kwDOAI0trM6fbDzz","body":"The purpose of step 9 in [setting the timeline](https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation) is to continue the animation from its previous progress on the new timeline. It seems that we didn't expect to have both start time and hold time set. Given the animation is holding in a finished state I guess we should make the start time unresolved in this case?","bodyHTML":"\u003cp dir=\"auto\"\u003eThe purpose of step 9 in \u003ca href=\"https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation\" rel=\"nofollow\"\u003esetting the timeline\u003c/a\u003e is to continue the animation from its previous progress on the new timeline. It seems that we didn't expect to have both start time and hold time set. Given the animation is holding in a finished state I guess we should make the start time unresolved in this case?\u003c/p\u003e","bodyVersion":"25adc8be328433bfa6b0fbd5d16f227d32393d4d90f5797f66ca3e9f5cc63f6a","viewerCanUpdate":false,"url":"https://github.com/w3c/csswg-drafts/issues/11761#issuecomment-2674670835","createdAt":"2025-02-21T14:17:40Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnk5MjUyMjY4","name":"csswg-drafts","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjM3OTIxNg==","login":"w3c","url":"https://github.com/w3c"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"w3c/csswg-drafts","databaseId":9252268},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABlSjfB6AAqjI2NzQ2NzA4MzU="},{"node":{"__typename":"ReferencedEvent","__isIssueTimelineItems":"ReferencedEvent","__isTimelineEvent":"ReferencedEvent","databaseId":16402089577,"createdAt":"2025-02-21T15:03:55Z","actor":{"__typename":"User","login":"webkit-commit-queue","id":"MDQ6VXNlcjc3MDczNDM5","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/77073439?s=64\u0026u=a6eaa59b9822164b82ba439bc56cac5623b256ef\u0026v=4"},"willCloseSubject":false,"subject":{"__typename":"Issue","__isNode":"Issue","id":"I_kwDOAI0trM6q_-cq"},"commit":{"message":"[scroll-animations] WPT test scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative.html has failures\nhttps://bugs.webkit.org/show_bug.cgi?id=284545\nrdar://problem/141356963\n\nReviewed by Anne van Kesteren.\n\nThe technique used by this test to determine the phase [0] in which an animation\nis, which is not explicitly exposed via the Web Animations API, was not up-to-date\nwith the fact that progress-based animations remain active at the 100% boundary.\n\nSo we update the supporting `assert_phase()` function to deal with such animations\nand pass the previously failing assertion.\n\nBut going further into this test, we would hit a debug assertion when trying to compute\nthe unconstrained current time as we get to the end of the procedure to set the timeline\nas we move from the scroll timeline to the document timeline.\n\nI filed a spec issue [1] to deal with this and came up with a temporary fix to restore\nthe timing incompatibility and pass this test.\n\n[0] https://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states\n[1] https://github.com/w3c/csswg-drafts/issues/11761\n\n* LayoutTests/imported/w3c/web-platform-tests/scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative-expected.txt:\n* LayoutTests/imported/w3c/web-platform-tests/web-animations/testcommon.js:\n(assert_phase):\n* Source/WebCore/animation/WebAnimation.cpp:\n(WebCore::WebAnimation::setTimeline):\n\nCanonical link: https://commits.webkit.org/290787@main","messageHeadlineHTML":"[scroll-animations] WPT test scroll-animations/scroll-timelines/scrol…","messageBodyHTML":"…l-animation-effect-phases.tentative.html has failures\n\n\u003ca href=\"https://bugs.webkit.org/show_bug.cgi?id=284545\" rel=\"nofollow\"\u003ehttps://bugs.webkit.org/show_bug.cgi?id=284545\u003c/a\u003e\nrdar://problem/141356963\n\nReviewed by Anne van Kesteren.\n\nThe technique used by this test to determine the phase [0] in which an animation\nis, which is not explicitly exposed via the Web Animations API, was not up-to-date\nwith the fact that progress-based animations remain active at the 100% boundary.\n\nSo we update the supporting `assert_phase()` function to deal with such animations\nand pass the previously failing assertion.\n\nBut going further into this test, we would hit a debug assertion when trying to compute\nthe unconstrained current time as we get to the end of the procedure to set the timeline\nas we move from the scroll timeline to the document timeline.\n\nI filed a spec issue [1] to deal with this and came up with a temporary fix to restore\nthe timing incompatibility and pass this test.\n\n[0] \u003ca href=\"https://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states\" rel=\"nofollow\"\u003ehttps://drafts.csswg.org/web-animations-1/#animation-effect-phases-and-states\u003c/a\u003e\n[1] \u003ca class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2868897578\" data-permission-text=\"Title is private\" data-url=\"https://github.com/w3c/csswg-drafts/issues/11761\" data-hovercard-type=\"issue\" data-hovercard-url=\"/w3c/csswg-drafts/issues/11761/hovercard\" href=\"https://github.com/w3c/csswg-drafts/issues/11761\"\u003ew3c/csswg-drafts#11761\u003c/a\u003e\n\n* LayoutTests/imported/w3c/web-platform-tests/scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative-expected.txt:\n* LayoutTests/imported/w3c/web-platform-tests/web-animations/testcommon.js:\n(assert_phase):\n* Source/WebCore/animation/WebAnimation.cpp:\n(WebCore::WebAnimation::setTimeline):\n\nCanonical link: \u003ca href=\"https://commits.webkit.org/290787@main\" 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href="#top"><bdi class="Box-sc-g0xbh4-0 markdown-title" data-testid="issue-title-sticky">[web-animations-2] moving from a progress-based timeline to a monotonic timeline can yield incompatible timeline time and animation current time</bdi></a><span class="Text__StyledText-sc-17v1xeu-0 bvWSyv">#11761</span></div><div class="Box-sc-g0xbh4-0 jGasrR"><!--$--><!--/$--></div></div><div><div class="Box-sc-g0xbh4-0 cQpCwc"><button data-component="IconButton" type="button" class="prc-Button-ButtonBase-c50BI prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="medium" data-variant="invisible" aria-describedby=":R77i9b:-loading-announcement" aria-labelledby=":R7i9b:"><svg aria-hidden="true" focusable="false" class="octicon octicon-copy" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 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src="https://avatars.githubusercontent.com/u/49648?u=91c313bd9390e81d9279cddf92042de49788296c&v=4&size=48" data-testid="github-avatar"/></a></div><div class="Box-sc-g0xbh4-0 koxHLL ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 dqmClk"><a class="Box-sc-g0xbh4-0 cRhwji prc-Link-Link-85e08" href="https://github.com/graouts" data-hovercard-url="/users/graouts/hovercard" data-testid="issue-body-header-author">graouts</a></div><div class="Box-sc-g0xbh4-0 bJQcYY ActivityHeader-module__footer--FVHp7"><span>opened </span><a class="Box-sc-g0xbh4-0 bjFvWy prc-Link-Link-85e08" href="https://github.com/w3c/csswg-drafts/issues/11761#issue-2868897578" data-testid="issue-body-header-link"><relative-time sx="[object Object]" class="sc-aXZVg gcWyXp">on <!-- -->Feb 21, 2025</relative-time></a></div></div><div class="Box-sc-g0xbh4-0 kgTqOk ActivityHeader-module__narrowViewportWrapper--Hjl75"><div class="Box-sc-g0xbh4-0 izrTon ActivityHeader-module__edits--LwHTE"></div><div class="Box-sc-g0xbh4-0 kpoUe"><div class="Box-sc-g0xbh4-0 ezcJRX"></div><div class="Box-sc-g0xbh4-0 dnyPuu"><button data-component="IconButton" type="button" aria-label="Issue body actions" aria-haspopup="true" aria-expanded="false" tabindex="0" class="Box-sc-g0xbh4-0 ffkqe prc-Button-ButtonBase-c50BI prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="small" data-variant="invisible" aria-describedby=":R15bd5db:-loading-announcement" id=":R15bd5db:"><svg aria-hidden="true" focusable="false" class="octicon octicon-kebab-horizontal" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" style="display:inline-block;user-select:none;vertical-align:text-bottom;overflow:visible"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button></div></div></div></div></div><div class="IssueBodyViewer-module__IssueBody--MXyFt"><div data-testid="markdown-body" data-team-hovercards-enabled="true" class="markdown-body" data-turbolinks="false"><div class="Box-sc-g0xbh4-0 markdown-body NewMarkdownViewer-module__safe-html-box--cRsz0"><p dir="auto">I'm working on a failure in the WPT subtest "Playback rate affects whether active phase boundary is inclusive" in <code class="notranslate">scroll-animations/scroll-timelines/scroll-animation-effect-phases.tentative.html</code> and encountered what appears to be a spec issue. I've simplified the test in this particular reduction:</p> <div class="highlight highlight-text-html-basic notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="<style> .scroller { overflow: scroll; height: 200px; width: 200px; } .contents { height: 1200px; width: 100%; background-color: green; } </style> <div class="scroller"> <div class="contents"></div> </div> <script> (async function () { // create an animation associated with a progress-based timeline const timeline = new ScrollTimeline({ source: document.querySelector(".scroller") }); const animation = document.querySelector(".contents").animate({ opacity: [0.1, 1] }, { timeline }); await Promise.all([animation.ready, new Promise(requestAnimationFrame)]); // set the animation to the "after" phase const scroller = animation.timeline.source; const maxScroll = scroller.scrollHeight - scroller.clientHeight; scroller.scrollTop = 1.5 * maxScroll; // wait a frame and set the timeline to a monotonic timeline await new Promise(requestAnimationFrame); animation.timeline = document.timeline; })(); </script>"><pre class="notranslate"><span class="pl-kos"><</span><span class="pl-ent">style</span><span class="pl-kos">></span> .<span class="pl-c1">scroller</span> { <span class="pl-c1">overflow</span><span class="pl-kos">:</span> scroll; <span class="pl-c1">height</span><span class="pl-kos">:</span> <span class="pl-c1">200<span class="pl-smi">px</span></span>; <span class="pl-c1">width</span><span class="pl-kos">:</span> <span class="pl-c1">200<span class="pl-smi">px</span></span>; } .<span class="pl-c1">contents</span> { <span class="pl-c1">height</span><span class="pl-kos">:</span> <span class="pl-c1">1200<span class="pl-smi">px</span></span>; <span class="pl-c1">width</span><span class="pl-kos">:</span> <span class="pl-c1">100<span class="pl-smi">%</span></span>; <span class="pl-c1">background-color</span><span class="pl-kos">:</span> green; } <span class="pl-kos"></</span><span class="pl-ent">style</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">div</span> <span class="pl-c1">class</span>="<span class="pl-s">scroller</span>"<span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">div</span> <span class="pl-c1">class</span>="<span class="pl-s">contents</span>"<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">div</span><span class="pl-kos">></span> <span class="pl-kos"></</span><span class="pl-ent">div</span><span class="pl-kos">></span> <span class="pl-kos"><</span><span class="pl-ent">script</span><span class="pl-kos">></span> <span class="pl-kos">(</span><span class="pl-k">async</span> <span class="pl-k">function</span> <span class="pl-kos">(</span><span class="pl-kos">)</span> <span class="pl-kos">{</span> <span class="pl-c">// create an animation associated with a progress-based timeline</span> <span class="pl-k">const</span> <span class="pl-s1">timeline</span> <span class="pl-c1">=</span> <span class="pl-k">new</span> <span class="pl-v">ScrollTimeline</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">source</span>: <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">querySelector</span><span class="pl-kos">(</span><span class="pl-s">".scroller"</span><span class="pl-kos">)</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">animation</span> <span class="pl-c1">=</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-en">querySelector</span><span class="pl-kos">(</span><span class="pl-s">".contents"</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">animate</span><span class="pl-kos">(</span><span class="pl-kos">{</span> <span class="pl-c1">opacity</span>: <span class="pl-kos">[</span><span class="pl-c1">0.1</span><span class="pl-kos">,</span> <span class="pl-c1">1</span><span class="pl-kos">]</span> <span class="pl-kos">}</span><span class="pl-kos">,</span> <span class="pl-kos">{</span> timeline <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-k">await</span> <span class="pl-v">Promise</span><span class="pl-kos">.</span><span class="pl-en">all</span><span class="pl-kos">(</span><span class="pl-kos">[</span><span class="pl-s1">animation</span><span class="pl-kos">.</span><span class="pl-c1">ready</span><span class="pl-kos">,</span> <span class="pl-k">new</span> <span class="pl-v">Promise</span><span class="pl-kos">(</span><span class="pl-s1">requestAnimationFrame</span><span class="pl-kos">)</span><span class="pl-kos">]</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-c">// set the animation to the "after" phase</span> <span class="pl-k">const</span> <span class="pl-s1">scroller</span> <span class="pl-c1">=</span> <span class="pl-s1">animation</span><span class="pl-kos">.</span><span class="pl-c1">timeline</span><span class="pl-kos">.</span><span class="pl-c1">source</span><span class="pl-kos">;</span> <span class="pl-k">const</span> <span class="pl-s1">maxScroll</span> <span class="pl-c1">=</span> <span class="pl-s1">scroller</span><span class="pl-kos">.</span><span class="pl-c1">scrollHeight</span> <span class="pl-c1">-</span> <span class="pl-s1">scroller</span><span class="pl-kos">.</span><span class="pl-c1">clientHeight</span><span class="pl-kos">;</span> <span class="pl-s1">scroller</span><span class="pl-kos">.</span><span class="pl-c1">scrollTop</span> <span class="pl-c1">=</span> <span class="pl-c1">1.5</span> <span class="pl-c1">*</span> <span class="pl-s1">maxScroll</span><span class="pl-kos">;</span> <span class="pl-c">// wait a frame and set the timeline to a monotonic timeline</span> <span class="pl-k">await</span> <span class="pl-k">new</span> <span class="pl-v">Promise</span><span class="pl-kos">(</span><span class="pl-s1">requestAnimationFrame</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-s1">animation</span><span class="pl-kos">.</span><span class="pl-c1">timeline</span> <span class="pl-c1">=</span> <span class="pl-smi">document</span><span class="pl-kos">.</span><span class="pl-c1">timeline</span><span class="pl-kos">;</span> <span class="pl-kos">}</span><span class="pl-kos">)</span><span class="pl-kos">(</span><span class="pl-kos">)</span><span class="pl-kos">;</span> <span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span></pre></div> <p dir="auto">In WebKit – at the time of writing (<a href="https://commits.webkit.org/290776@main" rel="nofollow">290776@main</a>) – this particular test yields a debug assertion because we end up attempting an operation with a time value that is expressed in seconds and one expressed as a percentage. Here's how we get there, and I believe in accordance with the current specifications:</p> <h3 dir="auto">Step 1</h3> <p dir="auto">Under the call to <code class="notranslate">Element.animate()</code>, the procedure to <a href="https://drafts.csswg.org/web-animations-2/#setting-the-timeline" rel="nofollow">set the timeline of an animation</a> takes us inside the "if to finite timeline" branch and we set both the <em>start time</em> and the <em>hold time</em> to be <em>unresolved</em>.</p> <h3 dir="auto">Step 2</h3> <p dir="auto">As the <em>update animations and send events</em> procedure is triggered and the animation becomes <em>ready</em>, we <a href="https://drafts.csswg.org/web-animations-2/#animation-calculating-an-auto-aligned-start-time" rel="nofollow">calculate an auto-aligned start time</a> and set the <em>start time</em> to <code class="notranslate">0%</code> as the <em>hold time</em> remains <em>unresolved</em>.</p> <h3 dir="auto">Step 3</h3> <p dir="auto">After the animation timeline's source changes scroll position, and during the next occurence of the <em>update animations and send events</em> procedure, we <a href="https://drafts.csswg.org/web-animations-1/#update-an-animations-finished-state" rel="nofollow">update the animation's finished state</a> and match this condition:</p> <blockquote> <p dir="auto">If all three of the following conditions are true,</p> <ul dir="auto"> <li>the unconstrained current time is resolved, and</li> <li>animation’s start time is resolved, and</li> <li>animation does not have a pending play task or a pending pause task,</li> </ul> <p dir="auto">then update animation’s hold time based on the first matching condition for animation from below, if any:</p> </blockquote> <p dir="auto">… and then match this condition:</p> <blockquote> <p dir="auto">If playback rate > 0 and unconstrained current time is greater than or equal to associated effect end</p> </blockquote> <p dir="auto">… and finally this sub-condition:</p> <blockquote> <p dir="auto">If did seek is false, let the hold time be the maximum value of previous current time and associated effect end.</p> </blockquote> <p dir="auto">As a result, the <em>hold time</em> is set to <code class="notranslate">100%</code> and the <em>start time</em> remains set to <code class="notranslate">0%</code>.</p> <h3 dir="auto">Step 4</h3> <p dir="auto">As we <a href="https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation" rel="nofollow">set the timeline</a> to the document timeline, and as such move from a progress-based timeline to a monotonic timeline, we enter this condition:</p> <blockquote> <p dir="auto">If from finite timeline and previous progress is resolved,<br> Run the procedure to set the current time to previous progress * end time.</p> </blockquote> <p dir="auto">As such we immediately run the procedure to <a href="https://drafts.csswg.org/web-animations-2/#silently-set-the-current-time" rel="nofollow">silently set the current time</a> and enter this condition:</p> <blockquote> <p dir="auto">If any of the following conditions are true:</p> <ul dir="auto"> <li>animation’s hold time is resolved, or</li> <li>animation’s start time is unresolved, or</li> <li>animation has no associated timeline or the associated timeline is inactive, or</li> <li>animation’s playback rate is 0,</li> </ul> <p dir="auto">Set animation’s hold time to seek time.</p> </blockquote> <p dir="auto">As a result, the <em>hold time</em> becomes <code class="notranslate">0s</code> and the <em>start time</em> remains <code class="notranslate">0%</code>. Note that these two times are now using different time units.</p> <p dir="auto">As the <a href="https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation" rel="nofollow">setting the timeline</a> procedure continues, we additionally run this step:</p> <blockquote> <p dir="auto">If the start time of animation is resolved, make animation’s hold time unresolved.</p> </blockquote> <p dir="auto">As a result, the <em>hold time</em> becomes unresolved and the <em>start time</em> remains <code class="notranslate">0%</code>.</p> <p dir="auto">To finish <a href="https://drafts.csswg.org/web-animations-2/#animation-set-the-timeline-of-an-animation" rel="nofollow">setting the timeline</a> we <a href="https://drafts.csswg.org/web-animations-1/#update-an-animations-finished-state" rel="nofollow">update the animation's finished state</a> and attempt to compute the unconstrained current time at which point we attempt to compute:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="current time = (timeline time - start time) * playback rate"><pre class="notranslate"><code class="notranslate">current time = (timeline time - start time) * playback rate </code></pre></div> <p dir="auto">The <em>timeline time</em> is a resolved time expressed in seconds since the timeline is monotonic while the start time has remained <code class="notranslate">0%</code>. This is when WebKit hits a debug assertion.</p> <p dir="auto">The WPT in question test immediately sets the current time to <code class="notranslate">0</code> but I don't think we should be in the situation described above as we set the timeline.</p></div></div><div class="IssueBodyViewer-module__IssueBodyTaskList--r4XEH"><!--$--><div role="toolbar" aria-label="Reactions" class="d-flex gap-1 flex-wrap"></div><!--/$--></div></div></div></div></div></div></div><div data-testid="issue-viewer-comments-container" class="react-comments-container"><div class="Box-sc-g0xbh4-0 fDhSWy"><!--$--><h2 class="sr-only">Activity</h2><div data-testid="issue-timeline-container" class="Timeline__ToggleTimeline-sc-1nkzbnu-0 dbMnOz"></div><div class="Flash__StyledFlash-sc-hzrzfc-0 hlWueK"><a href="/signup?return_to=" data-jump-to-bottom-target="true" class="prc-Button-ButtonBase-c50BI" data-loading="false" data-no-visuals="true" data-size="medium" data-variant="primary" 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0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path> </svg> <button type="button" class="flash-close js-ajax-error-dismiss" aria-label="Dismiss error"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> You can’t perform that action at this time. </div> <template id="site-details-dialog"> <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open> <summary role="button" aria-label="Close dialog"></summary> <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal"> <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x"> <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg> </button> <div class="octocat-spinner my-6 js-details-dialog-spinner"></div> </details-dialog> </details> </template> <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;"> <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;"> </div> </div> <template id="snippet-clipboard-copy-button"> <div class="zeroclipboard-container position-absolute right-0 top-0"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>