L <code>header</code> element defines a <code>banner</code> landmark when its context is the <code>body</code> element.</li>
                    <li>
                      The HTML <code>header</code> element is not considered a <code>banner</code> landmark when it is descendant of any of following elements:
                      <ul>
                        <li><code>article</code></li>
                        <li><code>aside</code></li>
                        <li><code>main</code></li>
                  