Checks if the page is the currently active page.
<nav role="navigation">
<ul>
<?php foreach($pages as $subpage): ?>
<li<?php e($subpage->isActive(), ' class="active"') ?>>
<a href="<?php echo $subpage->url() ?>">
<?php echo html($subpage->title()) ?>
</a>
</li>
<?php endforeach ?>
</ul>
</nav>