Per spec,
```
[Exposed=Window]
partial interface AnimationTimeline {
readonly attribute CSSNumberish? currentTime;
readonly attribute CSSNumberish? duration;
Animation play (optional AnimationEffect? effect = null);
};
```
add `duration` and `play()`.
Bug 2006263 Comment 0 Edit History
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Per spec,
```
[Exposed=Window]
partial interface AnimationTimeline {
readonly attribute CSSNumberish? currentTime;
readonly attribute CSSNumberish? duration;
Animation play (optional AnimationEffect? effect = null);
};
```
add `duration` in this bug.