Input events dispatch to top-level frame

index.html

@@ -8289,8 +8289,9 @@ <h3>Ticks</h3>
  dispatch steps</dfn> on a <a>browsing context</a> <var>context</var>,
  and a <var>list of events</var> and their properties. These steps
  must be equivalent to performing the given input device manipulations
- on <var>context</var>, such that trusted events corresponding to the
- entries in <var>list of events</var>are dispatched.
+ on the top-browsing context ancestor of the <var>context</var>, such
+ that trusted events corresponding to the entries in <var>list of events</var>
+ are dispatched.
 
 <aside class=note>
  <p>The list of events is not comprehensive; in particular the default