Reinstance old conformance section

To minimize differences in the transition

Author: foolip

index.bs

@@ -23,7 +23,7 @@ Abstract: It is primarily intended to allow web authors to write tests
 Abstract: that automate a user agent from a separate controlling process,
 Abstract: but may also be used in such a way as to allow in-browser scripts
 Abstract: to control a — possibly separate — browser.
-Boilerplate: index no, idl-index no, issues-index no
+Boilerplate: conformance no, index no, idl-index no, issues-index no
 </pre>
 
 <pre class=biblio>
@@ -104,6 +104,22 @@ allows vendors to expose functionality that is specific to their browser.
 </section> <!-- /Design Notes -->
 
 
+<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,
+so long as the end result is equivalent.
+Algorithms in this document are typically written with readability,
+rather than performance, in mind.
+</section>
+
+
 <section>
 <h2 id=terminology>Terminology</h2>