How to convert select dropdown to Multiple Checkbox?
<p>I want to convert below dropdown code into multi select checkbox value. I am using wordpress and below code is coming from third party website. I don't have any access to that third party website. So, with this function I can provide multi select option into the dropdown it self.</p>

<p><a href="https://i.stack.imgur.com/XXst4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XXst4.png" alt="dropdown value will be like this"></a></p>

<pre><code>&lt;div class="facilities"&gt;
   &lt;span class="label"&gt;Facilities&lt;/span&gt;
   &lt;span class="input"&gt;
      &lt;select&gt;
         &lt;option value=""&gt;--- All ---&lt;/option&gt;
         &lt;option value="39945"&gt;Internet&lt;/option&gt;
         &lt;option value="39946"&gt;Swimming Pool&lt;/option&gt;
         &lt;option value="39947"&gt;Beach&lt;/option&gt;
         &lt;option value="39948"&gt;B&amp;B&lt;/option&gt;
         &lt;option value="39949"&gt;Restaurant&lt;/option&gt;
      &lt;/select&gt;
   &lt;/span&gt;
&lt;/div&gt;
</code></pre>

<p>Looking for some solution with WordPress where I can change third party code after DOM Ready and change the code in multiple checkbox</p>