title: target _blank in HTML::a not working yii2
body: <p>I am using below peice of code.</p>
  
  <pre><code>[
              'attribute' =&gt; 'Application',
              'format' =&gt; 'html',
              'value' =&gt; function ($dataProvider) {
                  $student_username = $dataProvider-&gt;student_username;
                  return Html::a('Print', Url::toRoute(['/coordinatorpanel/print-form', 'student_username' =&gt; $student_username]),
                      ['target' =&gt; '_blank', 'class' =&gt; 'btn btn-success center-block']);
              },
          ]
  </code></pre>
  
  <p><strong>HTML OUTPUT :</strong> </p>
  
  <pre><code>&lt;a class="btn btn-success center-block" href="/nse/frontend/web/index.php?r=coordinatorpanel%2Fprint-form&amp;amp;student_username=COR39690113" target="_blank"&gt;
  </code></pre>
  
  <p>But, when I click on the link, I am not navigated to new tab, the request is processed in same Tab. I tried this on both 'Mozilla' and 'Chrome'.</p>
  
  <p>Any help would be deeply rewared :)</p>