diff --git a/index.html b/index.html
index 00450b39..88e3beb0 100644
--- a/index.html
+++ b/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 [=browsing context/top-level browsing context=] 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
@@ -11742,6 +11743,7 @@ <h2>Index</h2>
    <!-- Simple dialogs --> <li><dfn data-lt="simple dialog"><a href=https://html.spec.whatwg.org/#simple-dialogs>Simple dialogs</a></dfn>
    <!-- Steps to fire beforeunload --> <li><dfn><a href=https://html.spec.whatwg.org/#steps-to-fire-beforeunload>Steps to fire beforeunload</a></dfn>
    <!-- Suffering from bad input --> <li><dfn><a href=https://html.spec.whatwg.org/#suffering-from-bad-input>Suffering from bad input</a></dfn>
+   <!-- Top-level browsing context --> <li><dfn data-dfn-for="browsing context"><a href=https://html.spec.whatwg.org/#bc-tlbc>Top-level browsing context</a></dfn>
    <!-- Traverse the history by a delta --> <li><dfn><a href=https://html.spec.whatwg.org/#traverse-the-history-by-a-delta>Traverse the history by a delta</a></dfn>
    <!-- Unfocusing steps --><li><dfn><a href=https://html.spec.whatwg.org/#unfocusing-steps>unfocusing steps</a></dfn>
    <!-- User prompt --> <li><dfn data-lt="user prompts"><a href=https://html.spec.whatwg.org/#user-prompts>User prompt</a></dfn>