[css-animations-1][css-animations-2][editorial] Improve heading structure

Author: fantasai

css-animations-1/Overview.bs

@@ -100,7 +100,7 @@ Value Definitions</h3>
 	For readability they have not been repeated explicitly.
 
 <h2 id="animations">
-Animations</h2>
+CSS Animations Model</h2>
 
 	CSS Animations affect computed property values. This effect happens by
 	adding a specified value to the CSS cascade ([[!CSS3CASCADE]]) (at the
@@ -212,7 +212,7 @@ Animations</h2>
 	A future version of this specification may define how to render animations for these media.
 
 <h2 id="keyframes">
-Keyframes</h2>
+Declaring Keyframes</h2>
 
 	Keyframes are used to specify the values for the animating properties at various points
 	during the animation. The keyframes specify the behavior of one cycle of the animation;
@@ -453,6 +453,12 @@ Timing functions for keyframes</h3>
 
 	See the 'animation-timing-function' property for more information.
 
+<h2 id="animation-definition">
+Declaring Animations</h2>
+
+	CSS Animations are defined by binding keyframes to an element
+	using the 'animation' properties.
+
 <h3 id="animation-name">
 The 'animation-name' property</h3>
 

css-animations-2/Overview.bs

@@ -248,7 +248,11 @@ Note, this behavior relies on the fact that disassociating an animation
 from its <a>owning element</a> always causes it to enter (or remain) in the
 <a>idle play state</a>.
 
-# Keyframes # {#keyframes}
+<h2 id="keyframes">
+Declaring Keyframes</h2>
+
+<h3 id="keyframe-processing">
+Processing Keyframes</h3>
 
 For a given target (pseudo-)element, |element|, an animation name, |name|,
 and the position of the animation in |element|'s 'animation-name' list,
@@ -373,6 +377,12 @@ the behavior for some edge cases.
 We should verify what current implementations do and possible remove the
 requirement to iterate in reverse.
 
+<h2 id="animation-definition">
+Declaring Animations</h2>
+
+    CSS Animations are defined by binding keyframes to an element
+    using the 'animation' properties.
+
 ## The 'animation-duration' property ## {#animation-duration}
 
   <pre class='propdef'>