Avoid clobbering 'element' parameter

Author: bokand

cssom-view-1/Overview.bs

@@ -1417,8 +1417,8 @@ a <a>scrolling box</a> <var>scrolling box</var>, in order of innermost to outerm
         <dt>If <var>scrolling box</var> is associated with a <a>viewport</a>
         <dd>
             1. Let <var>document</var> be the <a>viewport’s</a> associated {{Document}}.
-            1. Let <var>element</var> be <var>document</var>'s root element, if there is one, or null otherwise.
-            1. <a for="viewport">Perform a scroll</a> of the <a>viewport</a> to <var>position</var>, with <var>element</var> as the associated element and <var>behavior</var>
+            1. Let <var>root element</var> be <var>document</var>'s root element, if there is one, or null otherwise.
+            1. <a for="viewport">Perform a scroll</a> of the <a>viewport</a> to <var>position</var>, with <var>root element</var> as the associated element and <var>behavior</var>
                 as the scroll behavior.
     </dl>