work on filter() section

case-study-porting-chardet-to-python-3.html

@@ -9,6 +9,7 @@
 <h1>Case study: porting chardet to Python 3</h1>
 
 <ol class="toc">
+<li><a href="#divingin">Diving in</a></li>
 <li><a href="#running2to3">Running <code class="filename">2to3</code></a></li>
 <li><a href="#falseisinvalidsyntax"><code>False</code> is invalid syntax</a></li>
 <li><a href="#nomodulenamedconstants">No module named <code class="filename">constants</code></a></li>
@@ -17,6 +18,16 @@
 <li><a href="#cantconvertbytesobject">Can't convert '<code>bytes</code>' object to <code>str</code> implicitly</a></li>
 </ol>
 
+<section id="divingin">
+
+<h2>Diving in</h2>
+
+<p class="fancy">FIXME intro</p>
+
+<p>...</p>
+
+</section>
+
 <section id="running2to3">
 
 <h2>Running <code class="filename">2to3</code></h2>