[css-animations-2] Add changes since level 1, w3c#8481

Author: svgeesus

css-animations-2/Overview.bs

@@ -811,3 +811,41 @@ console.log(anim.playState); // Should be 'running'.
   Security Considerations</h2>
     
   No security concerns have been reported on this specification.
+
+<h2 id="changes">Changes</h2>
+
+<h3 id="changes-level-1">Changes since CSS Animations, Level 1</h3>
+
+<ul>
+  <li>
+    The interaction between CSS Animations and Web Animations is defined, 
+    and the concepts of the owning element and animation composite order 
+    are introduced.
+  </li>
+  <li>
+    Generation of keyframe objects is described in detail
+  </li>
+  <li>
+    The animation-composition property is introduced, 
+    which defines the composite operation used 
+    when multiple animations affect the same property simultaneously.
+  </li>
+  <li>
+    The animation-timeline property is introduced, 
+    which defines the timeline used with the animation.
+  </li>
+  <li>
+    The animation shorthand property is updated 
+    to account for these new properties.
+  </li>
+  <li>
+    Dispatch of animation events is described.
+  </li>
+  <li>
+    The CSSAnimation interface is added.
+  </li>
+  <li>
+    Requirements on pending style changesare described.
+  </li>
+
+</ul>