v>
  </main>
  <div data-fill-with="conformance">
   <h2 class="no-ref no-num heading settled" id="w3c-conformance"><span class="content">Conformance</span><a class="self-link" href="#w3c-conformance"></a></h2>
   <h3 class="no-ref no-num heading settled" id="w3c-conventions"><span class="content">Document conventions</span><a class="self-link" href="#w3c-conventions"></a></h3>
   <p>Conformance requirements are expressed
    with a combination of descriptive assertions
    and RFC 2119 terminology.
    The