[css-color-3] Only one definition for opacity, please.

Author: tabatkins

css-color-3/Overview.html

@@ -560,7 +560,7 @@ <h3 id=transparency><span class=secno>3.2. </span>Transparency: the ‘<a
        <tr>
         <th>Name:</th>
 
-        <td><dfn id=opacity>opacity</dfn></td>
+        <td><dfn>opacity</dfn></td>
        </tr>
 
        <tr>
@@ -612,7 +612,7 @@ <h3 id=transparency><span class=secno>3.2. </span>Transparency: the ‘<a
        <tr>
         <th>Name:</th>
 
-        <td><dfn id=opacity1>opacity</dfn></td>
+        <td><dfn id=opacity>opacity</dfn></td>
        </tr>
 
        <tr>