<!DOCTYPE html>
<html>

  {% include head.html %}

  <body>

    {% include header.html %}

    <div class="usa-grid">
      <div class="usa-content content usa-width-one-whole">
        {{ content }}
      </div>
    </div>

    {% include footer.html %}

  </body>

</html>

<!DOCTYPE html>
<html>

  {% include head.html %}

  <body>

    {% include header.html %}

    <main class="usa-grid">
      <div class="usa-content content usa-width-one-whole">
        {{ content }}
      </div>
    </main>

    {% include footer.html %}

  </body>

</html>

Use <main> in documentation site
Use <main> in documentation site
