Mention one more issue about clamping.

Author: dbaron

css3-transitions/Overview.html

@@ -1121,6 +1121,10 @@ <h2 id=animation-of-property-types-><span class=secno>6. </span> Animation
     properties were individually specified.
   </ul>
 
+  <p class=issue>Issue: Need to describe handling of out-of-range values that
+   can result from cubic-bezier(). Clamping values to the allowed range is
+   probably the best solution.
+
   <h2 id=animatable-properties-><span class=secno>7. </span> Animatable
    properties</h2>
 

css3-transitions/Overview.src.html

@@ -1111,6 +1111,10 @@ <h2>
         </li>
       </ul>
 
+      <p class="issue">Issue:  Need to describe handling of out-of-range
+      values that can result from cubic-bezier().  Clamping values to the
+      allowed range is probably the best solution.</p>
+
       <h2>
         Animatable properties
       </h2>