Update index.html

Author: LanWei22

index.html

@@ -7721,11 +7721,11 @@ <h3>Processing actions</h3>
 return <a>error</a> with <a>error code</a> <a>invalid argument</a>.
 
 <li><p>
-Set the <code>delta x</code> property of <var>action</var> to <var>delta x</var>.
+Set the <code>deltaX</code> property of <var>action</var> to <var>deltaX</var>.
 
 <li><p>
-Let <var>delta y</var> be the result of <a>getting the property</a>
-<code>delta y</code> from <var>action item</var>.
+Let <var>deltaY</var> be the result of <a>getting the property</a>
+<code>deltaY</code> from <var>action item</var>.
 
 <li><p>
 If <var>deltaY</var> is not <a>undefined</a> and is not an <a>Integer</a>,
@@ -7734,10 +7734,6 @@ <h3>Processing actions</h3>
 <li><p>
 Set the <code>deltaY</code> property of <var>action</var> to <var>deltaY</var>.
 
-<li><p>
-If <var>delta x</var> is not <a>undefined</a> and is not an <a>Integer</a>,
-return <a>error</a> with <a>error code</a> <a>invalid argument</a>.        
-
 <li><p>
 Return <a>success</a> with data <var>action</var>.
 </ol>