HTML
<form action="#" method="post" class="inline-form search-form">
<fieldset>
<legend class="is-vishidden">Search</legend>
<label for="search-field" class="is-vishidden">Search</label>
<input type="search" placeholder="Search" id="search-field" class="search-field" />
<button class="search-submit">
<span class="icon-search" aria-hidden="true"></span>
<span class="is-vishidden">Search</span>
</button>
</fieldset>
</form>