[web-animations-1][editorial] Move section

The most fundamental function of an Animation
is moderating the flow of time from the timeline
to the Animation Effect. Understanding how this
works is the most important thing, so pull it up.

Author: fantasai

web-animations-1/Overview.bs

@@ -892,6 +892,38 @@ Animations {#animations}
   may provide alternative means of ordering animations
   (see [[#animation-classes]]).
 
+### Calculating the current time of an animation ### {#the-current-time-of-an-animation}
+
+  The [=animation/current time=] of an [=animation=] is calculated from
+  the first matching condition below:
+
+  <dl class=switch>
+
+  : If the animation's [=hold time=] is [=unresolved|resolved=],
+  ::
+      The [=animation/current time=] is the animation's [=hold time=].
+
+  : If <em>any</em> of the following are true:
+    * the animation has no associated [=timeline=], or
+    * the associated [=timeline=] is [=inactive timeline|inactive=], or
+    * the animation's [=start time=] is [=unresolved=],
+  ::
+      The [=animation/current time=] is an [=unresolved=] time value.
+
+  : Otherwise,
+  ::
+      <blockquote>
+        <code><a for="animation">current time</a> =
+          (<var>timeline time</var> − <a>start time</a>)
+          × <a>playback rate</a></code>
+      </blockquote>
+
+      Where |timeline time| is the current [=time value=]
+      of the associated [=timeline=].
+      The [=playback rate=] value is defined in [[#speed-control]].
+
+  </dl>
+
 ### Setting the timeline of an animation ### {#setting-the-timeline}
 
   <div algorithm>
@@ -962,38 +994,6 @@ Setting the associated effect of an animation</h4>
 
   </div>
 
-### Calculating the current time of an animation ### {#the-current-time-of-an-animation}
-
-  The [=animation/current time=] is calculated from
-  the first matching condition below:
-
-  <dl class=switch>
-
-  : If the animation's [=hold time=] is [=unresolved|resolved=],
-  ::
-      The [=animation/current time=] is the animation's [=hold time=].
-
-  : If <em>any</em> of the following are true:
-    * the animation has no associated [=timeline=], or
-    * the associated [=timeline=] is [=inactive timeline|inactive=], or
-    * the animation's [=start time=] is [=unresolved=],
-  ::
-      The [=animation/current time=] is an [=unresolved=] time value.
-
-  : Otherwise,
-  ::
-      <blockquote>
-        <code><a for="animation">current time</a> =
-          (<var>timeline time</var> − <a>start time</a>)
-          × <a>playback rate</a></code>
-      </blockquote>
-
-      Where |timeline time| is the current [=time value=]
-      of the associated [=timeline=].
-      The [=playback rate=] value is defined in [[#speed-control]].
-
-  </dl>
-
 ### Setting the current time of an animation ### {#setting-the-current-time-of-an-animation}
 
   The [=animation/current time=] of an [=animation=] can be set to a new value