Sync interfaces/ with @webref/idl 3.66.3 (#54606)

Co-authored-by: wpt-pr-bot <[email protected]>

Author: github-actions[bot]

interfaces/web-animations-2.idl

@@ -116,20 +116,16 @@ dictionary AnimationPlaybackEventInit : EventInit {
 
 [Exposed=Window]
 interface AnimationTrigger {
-  readonly attribute AnimationTriggerBehavior behavior;
+  constructor(optional AnimationTriggerOptions options = {});
+  attribute AnimationTimeline timeline;
+  attribute AnimationTriggerBehavior behavior;
+  attribute any rangeStart;
+  attribute any rangeEnd;
+  attribute any exitRangeStart;
+  attribute any exitRangeEnd;
 };
 
-[Exposed=Window]
-interface TimelineTrigger : AnimationTrigger {
-  constructor(optional TimelineTriggerOptions options = {});
-  readonly attribute AnimationTimeline timeline;
-  readonly attribute any rangeStart;
-  readonly attribute any rangeEnd;
-  readonly attribute any exitRangeStart;
-  readonly attribute any exitRangeEnd;
-};
-
-dictionary TimelineTriggerOptions {
+dictionary AnimationTriggerOptions {
   AnimationTimeline? timeline;
   AnimationTriggerBehavior? behavior = "once";
   (TimelineRangeOffset or CSSNumericValue or CSSKeywordValue or DOMString) rangeStart = "normal";