Match the old conformance section

To minimize differences in the transition

Author: foolip

index.bs

@@ -105,7 +105,13 @@ allows vendors to expose functionality that is specific to their browser.
 </section> <!-- /Design Notes -->
 
 
-<section id="conformance">
+<section>
+<h2 id=conformance>Conformance</h2>
+<p>
+As well as sections marked as non-normative, all authoring guidelines, diagrams,
+examples, and notes in this specification are non-normative. Everything else in
+this specification is normative.
+
 <p>
 Conformance requirements phrased as algorithms
 or specific steps may be implemented in any manner,