{{ partial "header.html" . }}

  <body>
    <!-- Code that all your templates share, like a header -->
    {{ block "main" . }}
      <!-- The part of the page that begins to differ between templates -->
    {{ end }}
    {{ block "footer" . }}
    <!-- More shared code, perhaps a footer but that can be overridden if need be in  -->
    {{ end }}
  </body>
</html>