title: tippy plugin cannot show multiple tooltips with HTML content
body: <p>I have a tippy plugin initialized this way:</p>
  
  <pre><code>tippy('.tooltip_commands', {
                      delay: 100,
                      arrow: true,
                      arrowType: 'round',
                      size: 'large',
                      duration: 500,
                      animation: 'scale',
                      placement: 'left',
                      interactive: true,
                      trigger: 'click',
                      content: document.querySelector('#tooltip_content').cloneNode(true)
                  });
  </code></pre>
  
  <p>Where "tooltip_content" is:</p>
  
  <pre><code>&lt;div class="tooltip_templates"&gt;
      &lt;div id="tooltip_content"&gt;
          &lt;ul class="list-group"&gt;
              &lt;li class="list-group-item"&gt;
                  &lt;a id="_bajarFactura" href="#" title="Bajar factura"&gt;&lt;i class="sl-icon-cloud-download"&gt;&lt;/i&gt;Bajar factura original&lt;/a&gt;
              &lt;/li&gt;
              &lt;li class="list-group-item"&gt;
                  &lt;a id="_verFactura" data-toggle="modal" href="#myModal" title="Ver archivo de la factura"&gt;&lt;i class="sl-icon-doc"&gt;&lt;/i&gt;Ver factura original&lt;/a&gt;
              &lt;/li&gt;
              &lt;li class="list-group-item"&gt;
                  &lt;a id="_verDetalle" href="#" title="Ver detalles de la factura"&gt;&lt;i class="sl-icon-magnifier-add"&gt;&lt;/i&gt;Ver Detalle&lt;/a&gt;
              &lt;/li&gt;
              &lt;li class="list-group-item"&gt;
                  &lt;a id="_reEnviar" href="#" title="Re-enviar factura a un e-mail"&gt;&lt;i class="icon-Mail-Forward"&gt;&lt;/i&gt;Re-enviar&lt;/a&gt;
              &lt;/li&gt;
          &lt;/ul&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>And "tooltip_commands" are several buttons in a TABLE (one button for each row).</p>
  
  <p>After I run the page, only the last row shows the tooltip with the HTML content. All other rows shows the tooltip, but empty.</p>
  
  <p>Is there a way to solve it?</p>
  
  <p>Please see this Fiddle with the problem:</p>
  
  <p><a href="https://jsfiddle.net/desytec/ym4nubhw/21/" rel="nofollow noreferrer">https://jsfiddle.net/desytec/ym4nubhw/21/</a></p>