-<% | IO.Io {name, function, ...} => %>
-<b>IO error</b>: <% Web.html name %> for <% Web.html function %>
+<% | IO.Io {name, function, cause, ...} => %>
+<b>IO error</b>: <% Web.html name %> for <% Web.html function %><br>
+<b>Cause</b>: <% Web.html (Init.explain cause) %><br>
+<b>Tokens</b>: <p><% Web.htmlNl (Init.tokens ()) %></p>