Fix warnings from the http://validator.w3.org/nu validator:
- The banner role is unnecessary for element header.
- The navigation role is unnecessary for element nav.
- <header role="banner" class="pattern">
<h1>Toggle Navigation: No JS</h1>
</header>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<h1>Toggle Navigation: No JS</h1>
</header>
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
- <nav class="toggle-menu" role="navigation">
+ <nav class="toggle-menu">
<!--
The toggle-menu__target elements will be hidden to avoid scrolling around
when navigating to the fragment ids, see also
<!--
The toggle-menu__target elements will be hidden to avoid scrolling around
when navigating to the fragment ids, see also