Re: [csswg-drafts] [web-animations-2] Make TimelineTrigger interface support multiple timelines (#13175)

• From: David A via GitHub <noreply@w3.org>
• Date: Wed, 10 Dec 2025 11:12:33 +0000
• To: public-css-archive@w3.org
• Message-ID: <issue_comment.created-3636577599-1765365150-noreply@w3.org>

I think we're agreeing on doing this. I am putting this up for an async resolution.

The **proposed resolution** is to modify the `TimelineTrigger` interface to support multiple timelines.

old interface: 

````
interface TimelineTrigger {
   attribute AnimationTimeline timeline;
   attribute any rangeStart;
   attribute any rangeEnd;
   attribute any exitRangeStart;
   attribute any exitRangeEnd;
}
```

Proposed interface: 
```
interface TimelineTrigger {
  attribute sequence<TimelineTriggerRange> ranges;
}

interface TimelineTriggerRange {
   attribute AnimationTimeline timeline;
   attribute any rangeStart;
   attribute any rangeEnd;
   attribute any exitRangeStart;
   attribute any exitRangeEnd;
}
```

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Received on Wednesday, 10 December 2025 11:12:34 UTC