Merge pull request w3c#5448 from autokagami/web-animations-1

Author: tabatkins

web-animations-1/Overview.bs

@@ -4116,14 +4116,14 @@ interface Animation : EventTarget {
              attribute EventHandler             onfinish;
              attribute EventHandler             oncancel;
              attribute EventHandler             onremove;
-    void cancel();
-    void finish();
-    void play();
-    void pause();
-    void updatePlaybackRate(double playbackRate);
-    void reverse();
-    void persist();
-    void commitStyles();
+    undefined cancel();
+    undefined finish();
+    undefined play();
+    undefined pause();
+    undefined updatePlaybackRate(double playbackRate);
+    undefined reverse();
+    undefined persist();
+    undefined commitStyles();
 };
 </pre>
 
@@ -4433,7 +4433,7 @@ abstract {{AnimationEffect}} interface.
 interface AnimationEffect {
     EffectTiming         getTiming();
     ComputedEffectTiming getComputedTiming();
-    void                 updateTiming(optional OptionalEffectTiming timing = {});
+    undefined                 updateTiming(optional OptionalEffectTiming timing = {});
 };
 </pre>
 
@@ -4816,7 +4816,7 @@ interface KeyframeEffect : AnimationEffect {
     attribute CSSOMString?       pseudoElement;
     attribute CompositeOperation composite;
     sequence&lt;object&gt; getKeyframes();
-    void             setKeyframes(object? keyframes);
+    undefined             setKeyframes(object? keyframes);
 };
 </pre>