title: Accessibility for custom dropdown button
body: <p>Hi I need add keyboard navigation and accessibility to my custom dropdown button. Do you have any ideas? I thought about using aria?</p>
  
  <pre><code>&lt;div class="dropdown-select"&gt;
    &lt;input type="hidden" name="select_offer" class="dropdown-select--value" /&gt;
    &lt;button class="dropdown-select--btn"&gt; Lorem ipsum
      &lt;span class="sr-only"&gt;(rozwiń listę)&lt;/span&gt;
    &lt;/button&gt;
    &lt;ul class="opl-dropdown-select--list"&gt;
      &lt;li&gt;
        &lt;a href="#" data-option="value1"&gt;Lorem ipsum&lt;/a&gt;
      &lt;/li&gt;
      &lt;li&gt;
        &lt;a href="#" data-option="value2"&gt;Lorem ipsum&lt;/a&gt;
      &lt;/li&gt;
      &lt;li&gt;
        &lt;a href="#" data-option="value3"&gt;Lorem ipsum&lt;/a&gt;
      &lt;/li&gt;
    &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>