set window rect: add null references

Author: andreastt

webdriver-spec.html

@@ -3792,17 +3792,19 @@ <h3>Set Window Rect</h3>
 
  <li><p>Let <var>width</var> be the result of
   <a>getting a property</a> named <code>width</code>
-  from the <var>parameters</var> argument, else let it be <code>null</code>.
+  from the <var>parameters</var> argument, else let it be <a><code>null</code></a>.
 
  <li><p>Let <var>height</var> be the result of
   <a>getting a property</a> named <code>height</code>
-  from the <var>parameters</var> argument, else let it be <code>null</code>.
+  from the <var>parameters</var> argument, else let it be <a><code>null</code></a>.
 
-  <li><p>Let <var>x</var> be the result of <a>getting a property</a>
-   named <code>y</code> from the <var>parameters</var> argument, else let it be <a><code>null</code></a>.
+ <li><p>Let <var>x</var> be the result of <a>getting a property</a>
+  named <code>y</code> from the <var>parameters</var> argument,
+  else let it be <a><code>null</code></a>.
 
-  <li><p>Let <var>y</var> be the result of <a>getting a property</a>
-   named <code>x</code> from the <var>parameters</var> argument, else let it be <a><code>null</code></a>.
+ <li><p>Let <var>y</var> be the result of <a>getting a property</a>
+  named <code>x</code> from the <var>parameters</var> argument,
+  else let it be <a><code>null</code></a>.
 
  <li><p>If any of <code>width</code> or <code>height</code> or <code>x</code>
    or <code>y</code> is neither <code>null</code> nor an integer between 0 and